Industrial chemicals which have become widespread environmental pollutants. Each aroclor is a mixture of chlorinated biphenyls (1200 series) or chlorinated terphenyls (5400 series) or a combination of both (4400 series).
Industrial products consisting of a mixture of chlorinated biphenyl congeners and isomers. These compounds are highly lipophilic and tend to accumulate in fat stores of animals. Many of these compounds are considered toxic and potential environmental pollutants.
A basis of value established for the measure of quantity, weight, extent or quality, e.g. weight standards, standard solutions, methods, techniques, and procedures used in diagnosis and therapy.
Spectrophotometric techniques by which the absorption or emmision spectra of radiation from atoms are produced and analyzed.
Nitric acid (HNO3). A colorless liquid that is used in the manufacture of inorganic and organic nitrates and nitro compounds for fertilizers, dye intermediates, explosives, and many different organic chemicals. Continued exposure to vapor may cause chronic bronchitis; chemical pneumonitis may occur. (From Merck Index, 11th ed)
A group of chemical elements that are needed in minute quantities for the proper growth, development, and physiology of an organism. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Determination, by measurement or comparison with a standard, of the correct value of each scale reading on a meter or other measuring instrument; or determination of the settings of a control device that correspond to particular values of voltage, current, frequency or other output.
A worm-like blind tube extension from the CECUM.
Any substance in the air which could, if present in high enough concentration, harm humans, animals, vegetation or material. Substances include GASES; PARTICULATE MATTER; and volatile ORGANIC CHEMICALS.
Elements, compounds, mixtures, or solutions that are considered severely harmful to human health and the environment. They include substances that are toxic, corrosive, flammable, or explosive.
The monitoring of the level of toxins, chemical pollutants, microbial contaminants, or other harmful substances in the environment (soil, air, and water), workplace, or in the bodies of people and animals present in that environment.
The exposure to potentially harmful chemical, physical, or biological agents in the environment or to environmental factors that may include ionizing radiation, pathogenic organisms, or toxic chemicals.
In horses, cattle, and other quadrupeds, the joint between the femur and the tibia, corresponding to the human knee.
Large, robust forms of brown algae (PHAEOPHYCEAE) in the order Laminariales. They are a major component of the lower intertidal and sublittoral zones on rocky coasts in temperate and polar waters. Kelp, a kind of SEAWEED, usually refers to species in the genera LAMINARIA or MACROCYSTIS, but the term may also be used for species in FUCUS or Nereocystis.
Common name for FISHES belonging to the order Perciformes and occurring in three different families.
The persistent eating of nonnutritive substances for a period of at least one month. (DSM-IV)
The presence of contaminants or pollutant substances in the air (AIR POLLUTANTS) that interfere with human health or welfare, or produce other harmful environmental effects. The substances may include GASES; PARTICULATE MATTER; or volatile ORGANIC CHEMICALS.
A calcium salt that is used for a variety of purposes including: building materials, as a desiccant, in dentistry as an impression material, cast, or die, and in medicine for immobilizing casts and as a tablet excipient. It exists in various forms and states of hydration. Plaster of Paris is a mixture of powdered and heat-treated gypsum.
Preoccupation with the fear of having, or the idea that one has, a serious disease based on the person's misinterpretation of bodily symptoms. (APA, DSM-IV)
An agency in the Executive Branch of the Federal Government. It was created as an independent regulatory agency responsible for the implementation of federal laws designed to protect the environment. Its mission is to protect human health and the ENVIRONMENT.
Component of the NATIONAL INSTITUTES OF HEALTH. It conducts and supports basic and applied research to reduce the burden of human illness and dysfunction from environmental causes by, defining how environmental exposures, genetic susceptibility, and age interact to affect an individual's health. It was established in 1969.
The science of controlling or modifying those conditions, influences, or forces surrounding man which relate to promoting, establishing, and maintaining health.
Substances that increase the risk of NEOPLASMS in humans or animals. Both genotoxic chemicals, which affect DNA directly, and nongenotoxic chemicals, which induce neoplasms by other mechanism, are included.
Substances or energies, for example heat or light, which when introduced into the air, water, or land threaten life or health of individuals or ECOSYSTEMS.
The exposure to potentially harmful chemical, physical, or biological agents that occurs as a result of one's occupation.
Air pollutants found in the work area. They are usually produced by the specific nature of the occupation.
The science dealing with the establishment and maintenance of health in the individual and the group. It includes the conditions and practices conducive to health. (Webster, 3d ed)
A purine base found in most body tissues and fluids, certain plants, and some urinary calculi. It is an intermediate in the degradation of adenosine monophosphate to uric acid, being formed by oxidation of hypoxanthine. The methylated xanthine compounds caffeine, theobromine, and theophylline and their derivatives are used in medicine for their bronchodilator effects. (Dorland, 28th ed)
Enzymes of the transferase class that catalyze the transfer of a pentose group from one compound to another.
A publication issued at stated, more or less regular, intervals.
A parasitic hemoflagellate of the subgenus Leishmania leishmania that infects man and animals and causes visceral leishmaniasis (LEISHMANIASIS, VISCERAL). The sandfly genera Phlebotomus and Lutzomyia are the vectors.
The use of statistical methods in the analysis of a body of literature to reveal the historical development of subject fields and patterns of authorship, publication, and use. Formerly called statistical bibliography. (from The ALA Glossary of Library and Information Science, 1983)
Facilities equipped to carry out investigative procedures.
Publications printed and distributed daily, weekly, or at some other regular and usually short interval, containing news, articles of opinion (as editorials and letters), features, advertising, and announcements of current interest. (Webster's 3d ed)
Branch of medicine concerned with the prevention and control of disease and disability, and the promotion of physical and mental health of the population on the international, national, state, or municipal level.
A followup operation to examine the outcome of the previous surgery and other treatments, such as chemotherapy or radiation therapy.
Spread and adoption of inventions and techniques from one geographic area to another, from one discipline to another, or from one sector of the economy to another. For example, improvements in medical equipment may be transferred from industrial countries to developing countries, advances arising from aerospace engineering may be applied to equipment for persons with disabilities, and innovations in science arising from government research are made available to private enterprise.
A metallic element that has the atomic symbol Sb, atomic number 51, and atomic weight 121.75. It is used as a metal alloy and as medicinal and poisonous salts. It is toxic and an irritant to the skin and the mucous membranes.
Benzoic acid or benzoic acid esters substituted with one or more chlorine atoms.
Metals that constitute group 1(formerly group Ia) of the periodic table. They are the most strongly electropositive of the metals. Note that HYDROGEN is not considered an alkali metal even though it falls under the group 1 heading in the periodic table.
Exclusive legal rights or privileges applied to inventions, plants, etc.
Toxic, volatile, flammable liquid hydrocarbon byproduct of coal distillation. It is used as an industrial solvent in paints, varnishes, lacquer thinners, gasoline, etc. Benzene causes central nervous system damage acutely and bone marrow damage chronically and is carcinogenic. It was formerly used as parasiticide.
Electropositive chemical elements characterized by ductility, malleability, luster, and conductance of heat and electricity. They can replace the hydrogen of an acid and form bases with hydroxyl radicals. (Grant & Hackh's Chemical Dictionary, 5th ed)
Substances produced from the reaction between acids and bases; compounds consisting of a metal (positive) and nonmetal (negative) radical. (Grant & Hackh's Chemical Dictionary, 5th ed)

Induction of hepatic cytochromes P450 in dogs exposed to a chronic low dose of polychlorinated biphenyls. (1/125)

Induction of cytochrome P450 isoforms, specifically CYP1A1, and their catalytic activities are potential biomarkers of environmental contamination by polychlorinated biphenyls (PCBs). In this study, dogs were exposed to 25 ppm or 5 ppm Aroclor 1248 (PCB mixture) daily in their diet for 10 or 20 weeks, respectively. Relative to controls, hepatic microsomes from dogs dosed with PCBs had higher levels of CYP1A1 detected in immunoblots and higher levels of EROD activity, but low levels of induction for CYP2B and PROD activity. Concentrations of 96 PCB congeners in serum and liver were evaluated using capillary chromatography. Results showed that all dogs exposed to PCB mixtures had higher levels of PCB in serum and liver. Dogs preferentially sequestered highly chlorinated PCB congeners in liver relative to serum. With these experiments, we demonstrated that EROD activity was a potentially sensitive marker of PCB exposure at 5 and 25 ppm. Furthermore, CYP1A1 and EROD activity were maximally induced in dogs consuming dietary concentrations only 2.5 times the maximal permissible level for human food (FDA). The value of CYP1A1 induction as a biomarker of PCB exposure was tenuous because neither CYP1A1 levels nor EROD activity correlated with total PCB body burden. However, a small subset of congeners were identified in liver that may strongly influence EROD and PROD induction. Finally, two dogs in the 25 ppm dose group were fasted for 48 h. After 24 h of fasting, several new congeners appeared in the serum and remained in the serum for the remainder of the fast. The fast caused a 293% increase in PCB concentration in serum. This increase has strong implications regarding mobilization of toxic PCBs in wildlife during fasting (e.g., migration, hibernation).  (+info)

Stimulation of pregnant rat uterine contraction by the polychlorinated biphenyl (PCB) mixture aroclor 1242 may be mediated by arachidonic acid release through activation of phospholipase A2 enzymes. (2/125)

The polychlorinated biphenyl (PCB) mixture Aroclor 1242 (A1242) increases frequency of contractions of pregnant rat uteri, suggesting a possible mechanism for decreased gestational age and increased spontaneous abortion in women and animals exposed to PCBs. In the present study, we hypothesized that A1242-induced stimulation of uterine contraction is mediated by arachidonic acid released by phospholipase A2 (PLA2) enzymes. Isometric uterine contraction was measured in longitudinal uterine strips isolated from gestation day 10 rat. Pretreatment of uterine strips with the PLA2 inhibitor (E)-6-(bromomethylene)tetrahydro-3-(1-naphthalenyl)-2H-pyran-2-one (HELSS) or manoalide, or an inhibitor of the G protein of PLA2, isotetrandrine, completely prevented the increase of contractile frequency induced by 50 microM A1242. However, the phospholipase C inhibitors 2-nitro-4-carboxyphenyl-N,N-diphenylcarbamate (NCDC) and neomycin were unable to block stimulation of uterine contraction by A1242. In accordance, A1242 (100 microM) did not release inositol phosphates from myo-[3H]inositol-labeled myometrial cells, whereas myometrial cells prelabeled with [3H]arachidonic acid released arachidonic acid in a concentration- and time-dependent manner after exposure to A1242 (10-100 microM). A1242 significantly stimulated arachidonic acid release in the absence of extracellular calcium, although the release was attenuated. Analysis of the eicosanoids released by A1242 indicated that only 0.83% of released [3H]arachidonic acid was metabolized to eicosanoids and 99.07% remained as free arachidonate. Uterine contraction increased in strips exposed to exogenous arachidonic acid (1-100 microM). This study suggests that A1242 stimulates contraction in pregnant rat uterus by a mechanism involving PLA2-mediated arachidonic acid release, and that arachidonic acid, rather than eicosanoids, may mediate A1242 uterotonic action in the uterus.  (+info)

Establishment of a polychlorinated biphenyl-dechlorinating microbial consortium, specific for doubly flanked chlorines, in a defined, sediment-free medium. (3/125)

Estuarine sediment from Charleston Harbor, South Carolina, was used as inoculum for the development of an anaerobic enrichment culture that specifically dechlorinates doubly flanked chlorines (i.e., chlorines bound to carbon that are flanked on both sides by other chlorine-carbon bonds) of polychlorinated biphenyls (PCBs). Dechlorination was restricted to the para chlorine in cultures enriched with 10 mM fumarate, 50 ppm (173 microM) 2,3,4, 5-tetrachlorobiphenyl, and no sediment. Initially the rate of dechlorination decreased upon the removal of sediment from the medium. However, the dechlorinating activity was sustainable, and following sequential transfer in a defined, sediment-free estuarine medium, the activity increased to levels near that observed with sediment. The culture was nonmethanogenic, and molybdate, ampicillin, chloramphenicol, neomycin, and streptomycin inhibited dechlorination activity; bromoethanesulfonate and vancomycin did not. Addition of 17 PCB congeners indicated that the culture specifically removes double flanked chlorines, preferably in the para position, and does not attack ortho chlorines. This is the first microbial consortium shown to para or meta dechlorinate a PCB congener in a defined sediment-free medium. It is the second PCB-dechlorinating enrichment culture to be sustained in the absence of sediment, but its dechlorinating capabilities are entirely different from those of the other sediment-free PCB-dechlorinating culture, an ortho-dechlorinating consortium, and do not match any previously published Aroclor-dechlorinating patterns.  (+info)

Differential binding affinities of PCBs, HO-PCBs, and aroclors with recombinant human, rainbow trout (Onchorhynkiss mykiss), and green anole (Anolis carolinensis) estrogen receptors, using a semi-high throughput competitive binding assay. (4/125)

A comparative study was undertaken to assess the ability of 44 polychlorinated biphenyls (PCBs), 9 hydroxylated PCBs (HO-PCBs), and 8 aroclors at concentrations ranging from 1 nM to 10 microM to compete with [3H]17beta-estradiol (E2) for binding to bacterially expressed fusion proteins using a semi-high throughput competitive-binding assay. The fusion proteins consisted of the D, E, and F domains of human (alpha), cloned reptilian (Anolis carolinensis) and recloned rainbow trout (Onchorhynkiss mykiss) estrogen receptors (ER) linked to the glutathione S-transferase (GST) protein. GST-hERalphadef (human), GST-aERdef (reptile) and GST-rtERdef (rainbow trout) fusion proteins exhibited high affinity for E2 with dissociation constants (Kd) of 0.4+/-0.1 nM, 0.7+/-0.2 nM, and 0.6+/-0.1 nM, respectively. Of the 44 PCBs examined, only PCBs 104, 184, and 188 effectively competed with [3H]E2 for binding to the GST-rtERdef protein with IC50 values ranging from 0.4-1.3 microM. In contrast, these same congeners only caused a 30% displacement of [3H]E2 in GST-hERalphadef and GST-aERdef proteins. Several additional congeners were found to bind to the GST-rtERdef fusion protein, although the degree of interaction varied among congeners. Among the HO-PCBs, 2',3',4',5'-tetrachloro-4-biphenylol and 2,6,2',6'-tetrachloro-4-biphenylol bound to all three fusion proteins with IC50 values ranging from 0.1-0.3 microM. Dimethyl sulphoxide (DMSO) concentrations of 20% significantly increased the ability of PCBs 104, 184, and 188 to compete with [3H]E2 for binding to the GST-ERdef fusion proteins, whereas at 20% DMSO, a significant reduction in saturable binding was observed. These results demonstrate that ERs from different species exhibit differential ligand preferences and relative binding affinities for PCBs, which can be dramatically affected by DMSO concentration.  (+info)

An assessment of neurotoxicity of aroclors 1016, 1242, 1254, and 1260 administered in diet to Sprague-Dawley rats for one year. (5/125)

As part of a comparative chronic toxicity/oncogenicity study of different Aroclors (1016, 1242, 1254, and 1260), neurotoxicity was assessed in male and female Sprague-Dawley rats using functional observational battery (FOB) and motor activity tests, and histopathologic evaluation of selected nervous system tissues. Doses varied by Aroclor and ranged from 25 to 200 ppm in the diet. Animals were evaluated prior to initiation of dosing and at 13, 26, 39, and 52 weeks of exposure. Clinical signs, body weights, and feed consumption were evaluated weekly. Data analysis of FOB and motor activity results revealed several instances where Aroclor-treated groups were different from control. However, these were considered incidental, as they lacked any consistent dose- or time-related pattern that would suggest Aroclor-induced neurotoxicity. The nonremarkable findings during each of the four assessments were supported by the absence of any treatment-related clinical signs or mortality. Decreased body weight gain was evident in the male 100 ppm Aroclor 1254 dose group and in all female Aroclor 1254 dose groups late in the study (when a linear relationship was assumed between body weight and time), correlating with decreased feed consumption. Although a variety of incidental, spontaneous, degenerative changes were found in nervous tissue evaluated histopathologically, these changes were seen with similar incidence and severity in treated and control groups. No lesions were found that could be attributed to Aroclor-related neurotoxicity. In summary, 52 weeks of exposure to Aroclors 1016, 1242, 1254, or 1260 mixed in the diet did not yield any functional or morphologic changes indicative of PCB-induced neurotoxicity.  (+info)

Inhibition of rat testicular androgenesis by a polychlorinated biphenyl mixture aroclor 1248. (6/125)

Polychlorinated biphenyls (PCBs) are complex mixtures of congeners that exhibit carcinogenic and toxicant activities in a variety of mammalian tissues. Here, we studied the acute in vivo and in vitro effects of a commercially used PCB product, Aroclor 1248 (A1248), a mixture of tri-, tetra-, and pentachloro congeners. Single intraperitoneal (i.p.) or bilateral intratesticular (i.t.) injections of A1248 decreased serum androgen levels in both groups 24 h after injection. Chorionic gonadotropin-stimulated androgen production by acute testicular cultures from both groups was also reduced, and progesterone production was attenuated in cultures from i.t.-treated animals. The capacity of the postmitochondrial fractions from testes of i.t.-treated animals to convert pregnenolone to progesterone and progesterone to testosterone was reduced as well. In vitro studies revealed that a 10- to 15-min exposure of postmitochondrial testicular fractions and intact interstitial cells from normal animals to A1248 in a subnanomolar concentration range was sufficient to attenuate the conversion of pregnenolone to progesterone and progesterone to testosterone. At micromolar concentrations, A1248 added in vitro also inhibited the conversion of Delta(4)-androstendione to testosterone without affecting the viability of interstitial cells. These results indicate that A1248 down-regulates the testicular androgenesis by an acute inhibition of 3beta-hydroxysteroid dehydrogenase, 17alpha-hydroxylase/lyase, and 17beta-hydroxysteroid dehydrogenase activities.  (+info)

Acute effects of polychlorinated biphenyl-containing and -free transformer fluids on rat testicular steroidogenesis. (7/125)

Polychlorinated biphenyl (PCB)-based transformer fluids belong to a class of environmentally persistent mixtures with known toxic effects. Here, we studied the acute effects of Askarel (which contains Aroclor 1260) and two substitute transformer fluids (the silicone oil-based DC561 and the mineral oil-based ENOL C) on rat testicular steroidogenesis. Single intraperitoneal (ip; 10 mg/kg body weight) or bilateral intratesticular (itt; 25 microg/testis) injections of Askarel markedly decreased serum androgen levels 24 hr after administration. In acute testicular cultures from these animals, chorionic gonadotropin-stimulated progesterone and androgen productions were severely attenuated. When itt was injected or added in vitro, Askarel inhibited 3ss-hydroxysteroid dehydrogenase (3ssHSD), stimulated 17[alpha]-hydroxylase/lyase (P450c17), and did not affect 17ss-hydroxysteroid dehydrogenase in testicular postmitochondrial fractions. The ip-injected Askarel did not affect 3ssHSD, but inhibited P450c17, suggesting that a more intensive metabolism of peripherally injected Askarel reduces the circulating levels of active ingredients below the threshold needed for inhibition of 3ssHSD and generates a derivative that inhibits P450c17. In contrast to Askarel, itt-injection (25 microg/testis) of DC561 and ENOL C did not affect in vivo and in vitro steroidogenesis. These findings show the acute effects of Askarel, but not silicone and mineral oils, on testicular steroidogenesis.  (+info)

Effects of subchronic exposure to complex mixtures of dioxin-like and non-dioxin-like polyhalogenated aromatic compounds on thyroid hormone and vitamin A levels in female Sprague-Dawley rats. (8/125)

The aim of this study was to determine the effects of subchronic exposure to complex mixtures of polyhalogenated aromatic hydrocarbons (PHAHs) on the thyroid hormone and retinoid status in female Sprague-Dawley rats and to investigate the predictability of these effects by the toxic equivalency factor (TEF) concept. In the first experiment, the focus was on a complex dioxin-like PHAH mixture, which covered > 90% of the total toxic equivalents (TEQ) present in Baltic herring. In the second experiment, the contribution of non-dioxin-like polychlorinated biphenyls (PCBs) was investigated by testing the commercial PCB mixture Aroclor 1260, its 0-1 ortho and 2-4 ortho fractions and the reconstituted 0-4 ortho fraction. Hepatic retinoid levels were severely decreased ( approximately 70%) after treatment with the dioxin-like PHAH mixture, similar to the effect of a TEQ equivalent dose of 1 microg 2,3,7,8-TCDD/kg bw/week. However, the TEF concept failed to predict the effect on plasma retinol; a decrease (21%) was observed after treatment with the PHAH mixture, whereas an increase (21%) was found after treatment with TCDD. A more severe decrease of total thyroid hormone in plasma was observed after exposure to the PHAH mixture compared to treatment with TCDD ( approximately 60% vs. 38%). The discrepancy found between the predicted and observed effects for plasma retinol and thyroid hormone is possibly due to an additional effect of hydroxylated PCBs, formed from metabolizable PCBs present in the PHAH mixture. Aroclor 1260 and its fractions did not significantly alter the retinoid and thyroid hormone status at the dose levels tested, indicating that in case of exposure to complex PCB mixtures at environmental levels, no effects, or at best, only marginal effects can be expected on the retinoid and thyroid hormone status.  (+info)

ERA is an accredited provider of Certified Reference Materials, Proficiency Testing and Quality Control Standards for laboratories in the environmental and life sciences markets.
Served as the lead human health risk assessment consultant in the preparation of a focused feasibility study and remedial action plan, and notification plan specifically for polychlorinated biphenyls (PCBs) for a former cast plate facility. Managed the development of site-specific risk-based screening levels for various chemicals in soil or soil vapor, including PCBs as Aroclor mixtures and dioxin-like congeners, for multiple receptors and exposure pathways. As part of the development of risk-based remediation goals, conducted a series of regression analyses to evaluate the relationship between the results of Aroclor mixture and dioxin-like PCB congener analyses and estimate a formula that could be used to: 1) estimate dioxin toxic equivalent concentrations for samples only analyzed for Aroclors, 2) support (or refine) proposed risk-based remediation goals based on Aroclor concentrations, and 3) support remediation confirmation sampling at a significantly reduced cost.. ...
SEATTLE - Members of the public tour the newly renovated fish ladder viewing room at the Lake Washington Ship Canal and Hiram M. Chittenden Locks, Aug. 16, 2012. Residents affectionately call the ship canal the Locks or Ballard Locks. Renovations included new gallery seating, display walls, and touchscreen monitors that show a series of short videos on the different salmon species. (Photo credit: Nicole Celestine) ...
There are many dimensions to the sea, and even a work of this size cannot possibly deal with them all. We have here the sea as a means of trade and communication, of the movement of people and ideas. We have the sea as a theatre of war, a sea fought-over itself, and the means of projecting force to distant lands. The sea unites, but it also divides; it may be an instrument of stability or of disorder. Different nations and societies, with different historical experiences, have seen the sea as a threat or an opportunity, and it is clear that either view may be correct. The sea has been the means of constructing empires, and of subverting them. The sea has opened opportunities for individuals to work and travel in remote parts of the world, and for whole populations to migrate to other continents. Fishing and whaling have provided rich sources of nutrition and industrial raw materials to peoples not otherwise endowed with them. Inland seas, navigable rivers and ship canals carry the sea into the ...
Gazetteer for Latchford Viaduct a place on the waterways on the Manchester Ship Canal (Main Line) showing information and facilities about the place.
Polychlorinated biphenyls (PCBs) are ubiquitous environmental pollutants. In the past, many commercial technologies have been used to clean up highly contaminated areas, but these methods are often very costly. An anaerobic/aerobic bioremediation process would be a simpler and cheaper alternative, but many aspects of this process are not understood, making the process of bioremediation difficult to implement. Aerobic PCB oxidation has been widely studied and microorganisms capable of this action have been isolated. Anaerobic dechlorination has also been well documented, but the responsible microorganisms have not been identified. Understanding the microbial community structure is required for optimizing an acceptable bioremediation process. This study attempted to address this lack of knowledge, in part, with two objectives. The first objective involved establishing cultures capable of dechlorinating 2,3,4,5-tetrachlorobiphenyl (CB) and its dechlorination products, 2,3,5-CB, 2,4,5-CB and 3,5-CB. ...
During the winter of 1993-1994, male lesser scaup (Aythya affinis) were collected on the heavily polluted Indiana Harbor Canal, East Chicago, Indiana, and examined for several bioindicators of chemica
Salford Quays is an area of Salford, Greater Manchester, England, near the end of the Manchester Ship Canal. Previously the site of Manchester Docks, it became one of the first and largest urban regeneration projects in the United Kingdom following the closure of the dockyards in 1982. Built by the Manchester Ship Canal Company, Salford Docks was the larger of two sections that made up Manchester Docks; the other being Pomona Docks to the east. They were opened in 1894 by Queen Victoria and spanned 120 acres (49 ha) of water and 1,000 acres (400 ha) of land. At their height the Manchester Docks were the third busiest port in Britain, but after containerisation and the limit placed on vessel size on the Manchester Ship Canal, the docks declined during the 1970s. They closed in 1982, resulting in the loss of 3000 jobs. In 1983 Salford City Council acquired parts of the docks covering 220 acres (90 ha) from the Manchester Ship Canal Company with the aid of a derelict land grant. The area was ...
5,5-Bis-trifluoromethyl-2,2-dichlorobiphenyl (5,5CF3-2,2PCB) is representative of a unique class of trifluoromethyl polychlorinated biphenyls (CF3-PCBs) found in sediments and fish of Lake Ontario, the Niagara river, and their tributaries. The potential hazard of 5,5CF3-2,2PCB was assessed by …
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EWGs Tap Water Database Polychlorinated biphenyls (PCBs) results for Madison Water Works | Polychlorinated biphenyls (PCBs). Find out what is in your tap water
EWGs Tap Water Database Polychlorinated biphenyls (PCBs) results for Phoenixville Water Dept | Polychlorinated biphenyls (PCBs). Find out what is in your tap water
Obesogens are frequently endocrine disruptors and belong to several chemical families. Several studies have been carried on POPs which are either dioxin-like (DL), ie they mimick the effect of dioxin on the dioxin receptor, AhR, or non DL. Rodent models indicate that DL chemicals may be obesogens. Exposure to TCDD (2,3,7,8-tetrachlorodibenzo-p-dioxin), 100 µg /kg b.w. once every 2 weeks for 8 weeks, increased body weights of adult mice over 40% higher than control-treated C3H/HeN mice (13). This body weight change was only seen when mice were fed a high fat diet. In a one-month study, chronic developmental exposure to the PCB mixture Aroclor 1254 was associated with increased body weights of mouse pups on postnatal days (PND) 16-20 (14). Further, exposure of adult mice PCB-77 led to an AhR dependent increase in body mass (15). This PCB-77 exposure also increased fatty liver in CVD model mice (16). Fatty liver, attributed to increased hepatic triglycerides and cholesterol, was also caused by 50 ...
Without the involvement of WDFW and the tribes your investigation of catch accounting for the 2016 Lake Washington coho run is only superficial and conclusions youve drawn only serve to stir up latent anger over treaty fishing rights. I am not at all surprised by the low coho catch by the Muckleshoot Tribe. The lack of catch in the Ship Canal could easily be explained by the choice of tribal fishermen to deploy their gear in the Duwamish River instead of the Ship Canal. The Muckleshoot Tribe has treaty fishing rights in both of these systems and the return to the Green River was probably stronger than the Lake Washington return. There may or may not be an explanation to your accounting, including the possibility of significant fallback as suggested by Mr. Nyman, or simply that you dont have all the information. Im sure that the intention of your investigation is to be constructive, but I cannot understand why you feel compelled to draw a conclusion without all the information. You probably do ...
This industrial hygiene summary report summarizes available information about workers who manufactured polychlorinated biphenyl (PCB) filled capacitors at plant 3. Production started in October 1957 and ended in March 1977. Complete work history records for 3,603 workers were microfilmed in March 1977 and 40 personal and 16 area air samples were collected for the evaluation of PCB exposures (NIOSH
Linh hoạt thay thế cho Chất thải xử lý ô nhiễm Polychlorinated biphenyls (PCBs) và các hợp chất thơm khác được khử trùng bằng clo được phân phối trong đất, bùn cặn, cửa sông, vv, tại hơn 400 trang web trong Hoa Kỳ một mình. Clo béo hydrocarbon (CAHs), rộng rãi được sử dụng để tẩy dầu mỡ và làm sạch động cơ, phụ tùng ô tô, và các thành phần điện tử, chất gây ô nhiễm nghiêm trọng tại 358 lớn các trang web trong chất thải nguy hại Hoa Kỳ. ...
A mortality study was conducted in workers with at least 90 days exposure to polychlorinated biphenyls PCBs between 1946 and 1977. Vital status was established for 98.7% of the 7075 workers studied. In hourly male workers, the mortality from all cancers was significantly below expected standardized mortality ratio SMR=81 ; 95% confidence...
This industrial hygiene summary report summarizes information about workers who manufactured large and small capacitors using polychlorinated biphenyls (PCBs) at a plant operating from 1938 through 1977. The first step in making a capacitor was to wind bales of foil and paper together tightly. This winding and the insertion of connecters was done automatically. Tops for the capacitors were assembl
NTP STATISTICAL ANALYSIS OF NON-NEOPLASTIC LESIONS REPORT: PEIRPT10 LAB: Battelle Columbus TEF EVALUATION (PCB MIXTURE;PCB 126/PCB 118) DATE: 04/27/04 EXPERIMENT: 96022 TEST: 02 TIME: 13:18:05 TEST TYPE: CHRONIC CAGES FROM 0000 TO LAST CAGE PAGE: 1 CONT: NO1-ES-75411 ROUTE: GAVAGE NTP C#: C96022 PATHOLOGIST: MISSING CAS: TEFPCBMIX ------------------------------------------------------------------------------------------------------------------------------------ 31 WEEK SSAC/FINAL#1 REASONS FOR REMOVAL: 25017 Scheduled Sacrifice REMOVAL DATE RANGE: 051600 051700 TREATMENT GROUPS: INCLUDE 001 0 NG / 0 UG INCLUDE 002 80 NG /10 UG INCLUDE 003 240 NG /30 UG INCLUDE 004 800 NG /100 UG INCLUDE 005 2400 NG/300 UG INCLUDE 006 4000 NG/500 UG NTP STATISTICAL ANALYSIS OF NON-NEOPLASTIC LESIONS REPORT: PEIRPT10 LAB: Battelle Columbus TEF EVALUATION (PCB MIXTURE;PCB 126/PCB 118) DATE: 04/27/04 EXPERIMENT: 96022 TEST: 02 TIME: 13:18:05 TEST TYPE: CHRONIC CAGES FROM 0000 TO LAST CAGE CONT: NO1-ES-75411 ROUTE: ...
Note: Located on Wirral peninsula on River Mersey; constructed in 19th cen. to house soap & margarine factory employees; terminus on Manchester Ship Canal. ...
I would like to post the following job opening that we have at PhenoPath Laboratories. If you would like any further information, please contact me or Paul Moore. Thanks. Patti Loykasek PhenoPath Laboratories Seattle, WA IMMUNOHISTOCHEMISTRY TECHNOLOGIST PhenoPath Laboratories, a pathology reference laboratory, has an opportunity in the clinical immunohistochemistry division for a full-time technologist, day shift. We are in a state-of-the-art facility located on the scenic Ship Canal in the eclectic Fremont neighborhood of Seattle, WA. Job Description: Responsibilities may include performing immunohistochemistry, immunofluorescence, molecular testing on patient samples and tissue sectioning (paraffin and frozen). Participation in the development of new tests or technologies, as well as participation in clinical research projects are also included. Quality control, safety, and preventive maintenance procedures and documentation are required elements of this position as well. Required ...
The award-winning New World Trading Company has announced that The Botanist MediaCityUK will be opening to the public in September 2017. The 14th edition to The Botanist portfolio will be situated in The Orange Tower, an 11 storey building in Manchesters MediaCityUK, a 200-acre mixed-use property development on the banks of the Manchester Ship Canal…
GC Application #14775: PCB Congener Analysis on ZB-50 (Mix 1). Column used: Zebron™ ZB-50, GC Cap. Column 30 m x 0.32 mm x 0.25 µm, Ea Part#: 7HM-G004-11
GC Application #14776: PCB Congener Analysis on ZB-1701 (Mix 2). Column used: Zebron™ ZB-1701, GC Cap. Column 30 m x 0.32 mm x 0.25 µm, Ea Part#: 7HM-G006-11
2021 Radiant Life. All Rights Reserved.. Statements on this website have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease. Consumers are advised to do their own research.. ...
Chiral PCB congeners are main the different parts of PCB mixtures and undergo enantioselective biotransformation to hydroxylated (OH-)PCBs by cytochrome P450 enzymes. 91, 95, 132 and 149. The OH-PCBs had been extracted through the microsomal incubations, derivatized with diazomethane and examined as the particular methoxylated (MeO-)PCB derivatives using chosen columns. The 5-hydroxylated metabolites of PCBs 91, 95, 132 and 149 had been the main metabolites, which can be in keeping with PCBs biotransformation by cytochrome P450 2B enzymes. All 5-hydroxylated metabolites shown a definite, congener-specific enantiomeric enrichment. General, this scholarly research demonstrates for the very first time that chiral PCBs, such as for example PCB 91, 95, 132 and 149, are metabolized to OH-PCBs by cytochrome P450 enzymes enantioselectively. and lactational exposures to multiple-substituted PCB congeners correlate with reduced intelligence quotients, impaired learning and memory, attentional deficits, ...
In this work, we examined the profile of metabolites produced from the doubly para-substituted biphenyl analogs 4,4-dihydroxybiphenyl, 4-hydroxy-4-chlorobiphenyl, 3-hydroxy-4,4-dichlorobiphenyl, and 3,3-dihydroxy-4,4-chlorobiphenyl by biphenyl-induced Pandoraea pnomenusa B356 and by its biphenyl dioxygenase (BPDO). 4-Hydroxy-4-chlorobiphenyl was hydroxylated principally through a 2,3-dioxygenation of the hydroxylated ring to generate 2,3-dihydro-2,3,4-trihydroxy-4-chlorobiphenyl and 3,4-dihydroxy-4-chlorobiphenyl after the removal of water. The former was further oxidized by the biphenyl dioxygenase to produce ultimately 3,4,5-trihydroxy-4-chlorobiphenyl, a dead-end metabolite. 3-Hydroxy-4,4-dichlorobiphenyl was oxygenated on both rings. Hydroxylation of the nonhydroxylated ring generated 2,3,3-trihydroxy-4-chlorobiphenyl with concomitant dechlorination, and 2,3,3-trihydroxy-4-chlorobiphenyl was ultimately metabolized to 2-hydroxy-4-chlorobenzoate, but hydroxylation of the ...
The Hudson River Reserve encompasses about 5000 acres of freshwater and brackish tidal wetlands and uplands distributed at four sites that span the middle 100 miles of the Hudson River Estuary. These four distinct tidal wetland sites are field laboratories for estuarine research, stewardship, education and training.. ...
The Aerial Lift Bridge spans 501.9 feet (153m) crossing over the Duluth Ship Canal to Lake Superior in Minnesotas St. Louis County, Duluth. The bridge was built to allow access to Minnesota Point aka Park Point from when a gap was created to establish the Duluth Ship Canal from the St. Louis River out to Lake Superior. This bridge was originally built in 1905 then converted into a vertical lift bridge in 1929 to allow for tall ships to pass underneath. The bridge can be lifted to allow for 135 feet (41m) of clearance for water traffic. Watching this bridge raise for large sea vessels as they leave the canal to Lake Superior past the lighthouses is quite an experience. It is the most photographed bridge on the Circle Tour. There is a sidewalk where you can walk on the bridge though no one is allowed on the bridge while its being lifted. You can enjoy this bridge anytime with live footage and see the boat schedules on duluthharborcam.com. The lighthouses that you will see at the canal are, ...
The Blue Angels returned to their headlining role in the Chicago Air & Water Show along the lakefront Aug. 15 and Aug. 16, 2015. Of the 17 performers (five military and 11 civilian), one was new: the Breitling Jet Team from France with seven L-39C Albatros jets.
Polychlorinated Biphenyls (PCBs) are synthetic organic chemicals. Uses include plasticisers in paints, plastics & rubber PCBs are a persistent organic pollutant
Despite production having stopped in the 1970s, polychlorinated biphenyls (PCBs) represent persistent organic pollutants that continue to pose a serious human health risk. Exposure to PCBs has been...
Bottom-feeding fish in the Hudson River have developed a gene that renders them immune to the toxic effects of PCBs, researchers say.
A method is described for the analysis of polychlorinated biphenyl (PCB) compounds in tissue samples. Cleanup by hexane-aceto-nitrile partitioning and Florisil column chromatography are performed on samples before oxidative treatment to convert DDE to DCBP. PCB components are then determined semi-quantitatively by TLC. No prior separation of PCB from chlorinated pesticides is required. The lower limit of sensitivity is 0.2 ?g....
Disclosed herein are a solvent for a chromogenic dye-precursor material for a pressure-sensitive recording paper sheet, comprising (1) 30 to 80% by weight of p-monoisopropylbiphenyl or a biphenyl mixture of not less than 80% by weight of p-monoisopropylbiphenyl, not more than 20% by weight of m-monoisopropylbiphenyl and not more than 10% by weight of diisopropylbiphenyl, and (2) 70 to 20% by weight of diisopropylnaphthalene or a naphthalene mixture of not less than 97% by weight of diisopropylnaphthalene, not more than 1% by weight of monoisopropylnaphthalene and not more than 2% by weight of triisopropylnaphthalene, and a pressure-sensitive recording paper sheet prepared by using the solvent.
The risk of catching some nasty germ in the Hudson River just started looking nastier. Disease-causing microbes have long been found swimming there, but now researchers have documented antibiotic-resistant strains in specific ...
After thirty years of pollution were dumped into the Hudson river from GE capacitor factories, its tomcods have developed a resistance to the toxins by changing a protein called AHR2
Design Quality Control: Lessons From The New NY Bridge - Tappan Zee Hudson River Crossing. Presented by: Dan Domalik, PE, CMQ/OE, CQA HDR Engineering 2014 Ohio Transportation Engineering Conference Session 17 October 28, 2014. Design-Build Team. Slideshow 6537057 by wyoming-potts
Hudson River Park is a 550-acre riverside park and estuarine sanctuary located on the west side of Manhattan between Battery Place and W.59th Street.
Hudson River Park is a 550-acre riverside park and estuarine sanctuary located on the west side of Manhattan between Battery Place and W.59th Street.
Riverkeeper, elected officials and the general public are dismayed that some of the arguments being offered on Hudson River anchorages by the industry are blatant falsehoods - statements that are easily disputed by the facts.
The toxic and carcinogenic compound 1,2-dichloropropane (DCP) is widely used in industry and agriculture. DCP shows a low chemical reactivity. It is only moderately soluble in aqueous systems and almost recalcitrant to microbial degradation under aerobic conditions. As a consequence DCP accumulates in groundwater, sediments and soil, thus endangering humans and animals via the food chain. To efficiently transform DCP to harmless organic compounds microbial mixed cultures have been enriched from sediments and were subsequently transferred into a fluidized bed bioreactor. This process allowed a continuous anaerobic dechlorination of DCP to propene. Bioreactor processes using complex microbiota represent a promising technology for transformation of chlorinated compounds. However, the composition of the used population is usually unknown, hence hindering both optimization and control of the degradation process. Subject of this work was the analysis of the microbial diversity of the ...
(2007) Steinberg et al. Hormones and Behavior. Polychlorinated biphenyls (PCBs) are a family of toxicants that persist in measurable quantities in human and wildlife tissues, despite their ban in production in 1977. Some PCB mixtures can act as...
Summit boat launch may get new life National Park Service grant to help village By Steve Metsch The weed-covered former boat launch along the Chicago Sanitary and Ship Canal, once an extremely popular site in Summit, may be resurrected for boaters, fishermen and lovers of the great outdoors. Mayor Sergio Rodriguez, at the Oct. 2…. Read More Summit boat launch may get new life ». ...
In spite of the anxious doubts expressed by the press, the improved trolley service was ready for the June 1 opening of the AYP, although on this stretch it had required eleventh-hour-help of a chain gang from the city jail. The Times complimented the prisoners for their able assistance. By mid-July the Seattle City Council was sufficiently aglow with the fairs success and the early evening light shows that outlined the many grand - if temporary - Beaux-Arts buildings, that they found an additional $300 to extent the string of carnival lights along NE 40th Street and so through this intersection.. POSTSCRIPT: The post-expo grandeur of this promenade from the Latona Bridge to the U.W. campus and Brooklyn and 14th Avenue (University Way) the main streets of Brooklyn (the University District), was short-lived. Neighborhood anxiety - especially among the businesses - came with the building of the Lake Washington Ship Canal in 1911. The bridge at Latona would clearly need to be enlarged for the ...
PCBs have been used for their electrical insulating properties in transformers, capacitors ( even in some domestic equipments), heat transfer and cooling systems, hydraulic systems and vaccum pumps, and a variety of other uses. Use of PCBs has now been restricted or stopped in numerous countries, but certain occupational groups are still exposed, notably in handling of chemical wastes, dealing with fires or accidents, working in or cleaning contaminated areas of servicing and dismantling old electrical apparatus; and the public in the vicinity of incinerators if the temperature is not high enough. Low levels of PCBs can be detected in many members of most industrial populations, and are concentrated in human milk. Poisoning by PCBs has been recognised as a result of occupational exposure, and in outbreaks in the general population, such as occurred in japan (Yusho disease), and in Taiwan, due to contamination of rice oil ...
Jenna Ladd| July 11, 2017 In the largest study of its kind, UI researchers have detected polychlorinated biphenyls (PCBs) in six schools throughout the midwest. Polychlorinated biphenyls (PCBs) are a class of manmade organic chemicals that were heavily used in construction and industry from 1929 until they were banned in 1979. PCBs are now known to…
This tag should be used on existing categories that are likely to be used by others, even though the real category is elsewhere. Redirected categories should be empty and not categorised themselves. It should not be used on categories that are misspellings and thus unlikely to be used by other people. Such categories should be tagged as ...
In 1974, Congress passed the Safe Drinking Water Act. This law requires EPA to determine safe levels of contaminants in drinking water...
Monsanto is being sued by three cities in California and the state of Washington due to impacts from contamination by their PCBs. Monsantos motion to dismiss lawsuits over PCB (polychlorinated biphenyls) contamination filed by the California cities of… Read More. ...
This news brief from March 2011 examines the genetic basis for the evolution of resistance to PCBs in the Hudson River tomcod. Though this is great for the tomcod, what might it mean for other organisms in the ecosystem?. Author/Source: ...
Famous public garden in the northwest Bronx along the Hudson River, with flower gardens, alpine house, greenhouses, and cultural center.
Yes, I compared with your PCB and its obvious, also another PIN is not connceted on you PCB, but on the one I got, please see attached picture: And the 2nd PCB contact from the right is not connected in your PCB, so I assume I have to cut this connection on my PCB, right ...
Para Site藝術空間為香港首屈一指的當代藝術中心,亦是亞洲歷史最悠久、最活躍的獨立藝術中心之一。
Para Site藝術空間為香港首屈一指的當代藝術中心,亦是亞洲歷史最悠久、最活躍的獨立藝術中心之一。
Luftrensere, Miljøbokse, Cyklonsugere, PCB Miljø sugere, Cyklonsugere 3 faset, Vådsugere, Ventilatorer, Kondensaffugtere, Adsorptionsaffugtere, Måleinstrumenter, Partikeltæller, Tagskanner
Different Aroclors were used at different times and for different applications. In electrical equipment manufacturing in the US ... They are hydrophobic, with low water solubilities: 0.0027-0.42 ng/L for Aroclors brand,[page needed] but they have high ...
Haloaromatics include the former Aroclors (Monsanto Company trademark for polychlorinated biphenyls, PCBs), once widely used in ...
Article The evaluation of extraction and cleanup methods for the determination of PCB aroclors in caulking and sealing material ... No comments were found for The evaluation of extraction and cleanup methods for the determination of PCB aroclors in caulking ... The evaluation of extraction and cleanup methods for the determination of PCB aroclors in caulking and sealing material. 0 ... The Aroclors were used as a plasticzier and were added to the material to ease application and improve resiliency. The caulking ...
Aroclors 1016 and 1260 on ZB5 15m x .32mm x .25um. Column used: Zebron™ ZB-5, GC Cap. Column 15 m x 0.32 mm x 0.25 µm, Ea Part# ...
ERA is an accredited provider of Certified Reference Materials, Proficiency Testing and Quality Control Standards for laboratories in the environmental and life sciences markets.
You searched for: Subject aroclors Remove constraint Subject: aroclors Publication Year 2017 Remove constraint Publication ... Aroclors were found in noticeably higher levels than OCPs in sediment and the highest levels of Aroclors, OCPs were found in ... Organochlorinated pesticides and Aroclors were measured in the muscle of two edible fish species (gray mullet, sea bream) and ... aroclors, etc ; chemistry; cluster analysis; factories; mass spectrometry; paddies; paddy soils; risk; steel; toxicity; Korean ...
The numbering standard for the different Aroclors is as follows:. *The first two digits usually refer to the number of carbon ... There are many types of Aroclors and each has a distinguishing suffix number that indicates the degree of chlorination. ...
Polychlorinated biphenyls (Aroclors) 1746016. 2,3,7,8-Tetrachlorodibenzo-p-dioxin 8001352. Toxaphene (chlorinated camphene) ...
Flexible Implementation of the Mercury and Air Toxics Standards Rule Memorandum of President of the United States, Dec. 21, 2011, 76 F.R. 80727, provided:. Memorandum for the Administrator of the Environmental Protection Agency Todays issuance, by the Environmental Protection Agency (EPA), of the final Mercury and Air Toxics Standards rule for power plants (the "MATS Rule") represents a major step forward in my Administrations efforts to protect public health and the environment.. This rule, issued after careful consideration of public comments, prescribes standards under section 112 of the Clean Air Act to control emissions of mercury and other toxic air pollutants from power plants, which collectively are among the largest sources of such pollution in the United States. The EPA estimates that by substantially reducing emissions of pollutants that contribute to neurological damage, cancer, respiratory illnesses, and other health risks, the MATS Rule will produce major health benefits for ...
Polychlorinated biphenyls (PCBs) are persistent environmental toxicants, present in 100% of U.S. adults and dose-dependently associated with obesity and non-alcoholic fatty liver disease (NAFLD). PCBs are predicted to interact with receptors previously implicated in xenobiotic/energy metabolism and …
Polychlorinated biphenyls (Aroclors). 0.009. 106503. p-Phenylenediamine. 10. 123386. Propionaldehyde. 5. 114261. Propoxur ( ...
... immediately discontinue the manufacture of Aroclors; respond responsibly, admitting growing evidence of environmental ...
"We know Aroclors [PCBs] are toxic but the actual limit has not been precisely defined." ... "The objective of the [PCB] committee was to recommend action that will: 1. Protect continued sales and profits of Aroclors; 2. ... sale and use of these particular Aroclors as well as to protect the continued use of other members of the Aroclor series." ... Aroclors 1254 and 1260) as nearly global environmental contaminants leading to contamination of human food (particularly fish ...
The use of PCB mixtures, commercially called Aroclors, changed over time. Aroclor 1254 was used from 1939 until a switch was ...
The Aroclors were used as a plasticzier and were added to the material to ease application and improve resiliency. The caulking ... The evaluation of extraction and cleanup methods for the determination of PCB aroclors in caulking and sealing material ...
The Aroclors were used as a plasticzier and were added to the material to ease application and improve resiliency. The caulking ... The evaluation of extraction and cleanup methods for the determination of PCB aroclors in caulking and sealing material ...
PCBs & Aroclors disrupt development .... Poster. Other. 599. Friday, June 27. Memorial Union. 5:45 - 7:00 pm. ...
... www.caslab.com/PCB-Congeners-Aroclors-Testing/ [accessed 12 Feb 2013]. ... Testing for PCB Congeners & Aroclors [website]. Kelso, WA:ALS-Columbia (2012). Available: http:// ...
Polychlorinated biphenyls (Aroclors) 1120714 1,3-Propane sultone 57578. beta-Propiolactone 123386. Propionaldehyde ...
Aroclors 1242, 1248, and 1254 were purchased from Ultra Scientific (North Kingstown, RI) or were gifts from Monsanto to the ... Table 1 shows the PCB congeners corresponding to each peak and includes only congeners found in Aroclors above the detection ... We included 8-11 uterine strips in each treatment group exposed to neat (parent) Aroclors. However, quantities of the PCB ... Extensive degradation of Aroclors and environmentally transformed polychlorinated biphenyls by Alcaligenes eutrophus H850. Appl ...
Aroclors: 41*Chlorodiphenyl (54% Chlorine): 136. *Polychloroterphenyl Compounds*Aroclors: 41*Chlorodiphenyl (54% Chlorine): 136 ...
Aroclors. 38. Arsenic. 1. Arthroderma cuniculi. 1. Arthroderma curreyi. 1. Arthroderma tuberculatum. ...
The serum samples were analyzed for total PCB levelsincluding aroclors 1254 and 1260. Results were as total PCB in units of g/L ...
... commercially called Aroclors, are unique to Monsanto. ...
Different Aroclors were used at different times and for different applications. In electrical equipment manufacturing in the US ... They are hydrophobic, with low water solubilities: 0.0027-0.42 ng/L for Aroclors brand,[page needed] but they have high ...
Aroclors and BFRs on Rxi-XLB and Rxi-17Sil MS (GCxGC). GC_EV1238. ...
Polychlorinated Biphenyls (Aroclors). *Polycylic Organic Matter. *Propylene Dichloride (1,2-Dichloropropane). *Propylene Oxide ...
The preferred halogenated polyphenyls are multichlorinated polyphenyls such as the Aroclors (tradename of Monsanto Company). ... Commercially available Aroclors include Aroclor 1242 (42% chlorinated biphenyl), Aroclor 1254 (54% chlorinated biphenyl) and ...
  • In the United States, PCBs are referred to by many other names including asbestol, aroclors, pyrenol and therminol. (cdc.gov)
  • There are 209 individual polychlorinated (PCBs), or congeners, that are derived from the commercial manufacture of polychlorinated biphenyl mixtures, such as the Aroclors. (epa.gov)
  • This test method may be applied to the determination of PCBs in insulating liquids contaminated by either individual Aroclors or mixtures of Aroclors. (astm.org)
  • The environmental segment is categorized into pesticide standards, volatiles / semivolatiles standards, flame retardants standards, aroclors, PCBs and dioxins standards, alkylphenols standards and solid waste standards. (pitchengine.com)
  • PCBs/Aroclors are identified by running SW-846 8082. (eurofinsus.com)
  • Analytical chemistry techniques provided congener-specific analysis of Aroclors that allowed scientists to assess the way PCBs moved and behaved in various media (called "fate and transport"), such as soil, water, and fish. (environmentalchemistry.com)
  • The PCBs from the Thompson Island Pool have an easily recognized pattern that is tied to one of GE's particular mixtures of Aroclors. (environmentalchemistry.com)
  • Selected Aroclors in transformer oil were analyzed by GC-ECD to determine a detection limit of PCBs , as Aroclors, in the transformer oil. (thefreedictionary.com)
  • The suit also alleges Monsanto knew of the toxicity, citing memos and internal position statements regarding PCBs under the trade name "Aroclors. (paintsquare.com)
  • The report noted that PCBs are a family of 209 compounds, including the commercially produced Aroclors that were marketed for use in electrical transformers, capacitors heat transfer systems and hydraulic systems. (uiowa.edu)
  • The studied pollutants were DDT's isomers, hexachlorocyclohexane [HCHS] isomers as well as cyclodiene compounds, mirex, methoxychlor, toxaphene and hexachlorobenzene [HCH], aroclors 1248, 1254 and 1260 in addition to nine individual PCBs congeners. (bvsalud.org)
  • Walk-through surveys were conducted at the General Electric facilities in Hudson, Falls and Ft. Edward, New York with particular interest in workers exposed to polychlorinated-biphenyls (1336363) (Aroclors). (cdc.gov)
  • A chromatogram of a mixture of Aroclors ® 1016 and 1260 on a 30m x 0.25mm ID x 0.25μm Equity-5 column is presented in Figure C . Analysis times of 38-45 minutes are not uncommon for this application. (sigmaaldrich.com)
  • 5.3 The technique described is based on data for standard chromatograms of Aroclors 1242, 1254, and 1260 obtained using specific chromatographic column packing materials and operating conditions. (astm.org)
  • Aroclors 1242, 1254, and 1260 are adequate standards because they have been found to be the most common PCB contaminant in electrical insulating oils. (astm.org)
  • Commercially available Aroclors include Aroclor 1242 (42% chlorinated biphenyl), Aroclor 1254 (54% chlorinated biphenyl) and Aroclor 5460 (60% chlorinated terphenyl). (google.com)
  • Antisera raised with Aroclor 1254-coated beads contained antibodies with high affinity (as determined by BIAcore analysis) against tetracholoro-biphenyls even though these congeners represent only a minor fraction in Aroclors. (elsevier.com)
  • The preferred halogenated polyphenyls are multichlorinated polyphenyls such as the Aroclors (tradename of Monsanto Company). (google.com)
  • The use of PCB mixtures, commercially called Aroclors, changed over time. (cdc.gov)
  • 1.2 The PCB mixtures known as Aroclors 2 were used in the formulation of the PCB-containing askarels manufactured in the United States. (astm.org)
  • First produced in the 1930 s, due to their stability and fire resistance, they found widespread use as electrical and capacitor insulating fluids in the form of commercial PCB mixtures known in the U.S. as Aroclors and by other names worldwide. (chromatography-online.org)
  • This method requires the use of second column for confirming the detected compounds due to the low selectivity of the ECD detector comparing with GC-MS/MS. Also pattern recognition is required for accurate identification of Aroclors. (selectscience.net)
  • Aroclor 1248 dominated other aroclors in all fish samples. (bvsalud.org)
  • Uterine strips from pregnant rats were suspended in standard muscle baths and analyzed for changes in isometric contractions in response to in vitro exposure to commercial PCB mixtures (Aroclors) and their dechlorinated products after microbial degradation. (thefreelibrary.com)
  • The residues of twenty-five organochlorine pollutants as well as three aroclors were analyzed by capillary GLC in two Tillipia fish species and Cyprinus carpio collected from Mariut Lake, Alexandria, Egypt. (bvsalud.org)
  • They may also be referred to as Aroclors, a popular trade name of commercial PCB mixtures. (in.gov)
  • Aroclors are assigned specific 4-digit reference numbers dependent upon molecular type and degree of substitution of the biphenyl ring hydrogen atoms by chlorine atoms. (usgs.gov)
  • They are hydrophobic, with low water solubilities: 0.0027-0.42 ng/L for Aroclors brand,[page needed] but they have high solubilities in most organic solvents, oils, and fats. (wikipedia.org)
  • The Aroclors were used as a plasticzier and were added to the material to ease application and improve resiliency. (environmental-expert.com)
  • In addition further reference may be made to BS EN 144-1:2009 + A1:2012 for the testing of aggregates and BS 1377:2018 for soils for civil engineering purposes. (chemtest.com)
  • Performed data validation and usability assessment for PCB Aroclors and Congeners in marine sediments, water, and air in support of USEPA Superfund and MassDEP MCP compliance. (neh-inc.com)