• ions
  • It transfers ions from the liquid phase to the gas phase for analysis. (wikipedia.org)
  • These ions are then separated according to their mass-to-charge ratio, typically by accelerating them and subjecting them to an electric or magnetic field: ions of the same mass-to-charge ratio will undergo the same amount of deflection. (wikipedia.org)
  • Early spectrometry devices that measured the mass-to-charge ratio of ions were called mass spectrographs which consisted of instruments that recorded a spectrum of mass values on a photographic plate. (wikipedia.org)
  • A mass spectroscope is similar to a mass spectrograph except that the beam of ions is directed onto a phosphor screen. (wikipedia.org)
  • An extraction system removes ions from the sample, which are then targeted through the mass analyzer and onto the detector. (wikipedia.org)
  • The differences in masses of the fragments allows the mass analyzer to sort the ions by their mass-to-charge ratio. (wikipedia.org)
  • organic
  • It is actually two techniques that are combined to form a single method for analyzing mixtures of organic chemicals. (springer.com)
  • Goñi MA, Ruttenberg KC, Eglinton TI (1997) Sources and contribution of terrigenous organic carbon to surface sediments in the Gulf of Mexico. (springer.com)
  • discharges
  • In 1886, Eugen Goldstein observed rays in gas discharges under low pressure that traveled away from the anode and through channels in a perforated cathode, opposite to the direction of negatively charged cathode rays (which travel from cathode to anode). (wikipedia.org)
  • With persistence Miller persuaded Urey to pursue electric discharges in gases. (wikipedia.org)
  • 1987
  • The original interface between capillary zone electrophoresis and mass spectrometry was developed in 1987 by Richard D. Smith and coworkers at Pacific Northwest National Laboratory, and who also later were involved in development of interfaces with other CE variants, including capillary isotachophoresis and capillary isoelectric focusing. (wikipedia.org)
  • affinity
  • The difference in the chemical properties between different molecules in a mixture and their relative affinity for the stationary phase of the column will promote separation of the molecules as the sample travels the length of the column. (wikipedia.org)
  • relatively
  • Helium has traditionally been the first-choice carrier gas, owing to its inertness, performance, and relatively cheap price. (chromatographyonline.com)
  • Perfume formulations cannot be protected by patents, and with the aid of modern analytic techniques, such as gas chromatography-mass spectrometry (GC-MS), it is relatively easy to analyze their composition, and thus to imitate a fragrance composed only of commercially available perfumery raw materials, such as essential oils and synthetic odorants sold on the market. (wikipedia.org)
  • characteristic
  • The concept that individuals might have a "metabolic profile" that could be reflected in the makeup of their biological fluids was introduced by Roger Williams in the late 1940s, who used paper chromatography to suggest characteristic metabolic patterns in urine and saliva were associated with diseases such as schizophrenia. (wikipedia.org)
  • Instrumentation
  • Further, it was noted that further progress in the field depended in large part, through addressing otherwise "irresolvable technical challenges", by technical evolution of mass spectrometry instrumentation. (wikipedia.org)
  • chambers
  • 8. The cartridge of claim 1, wherein at least one of the dispensing chambers is configured to dispense a mixture comprising at least one reagent. (patentgenius.com)
  • patterns
  • Relative toxicity and occurrence patterns of pesticide mixtures in streams draining agricultural watersheds dominated by corn and soybean production. (springer.com)
  • spectrometers
  • Sector mass spectrometers known as calutrons were developed by Ernest O. Lawrence and used for separating the isotopes of uranium during the Manhattan Project. (wikipedia.org)
  • Calutron mass spectrometers were used for uranium enrichment at the Oak Ridge, Tennessee Y-12 plant established during World War II. (wikipedia.org)
  • ratio
  • A mass spectrum is a plot of the ion signal as a function of the mass-to-charge ratio. (wikipedia.org)
  • Wilhelm Wien found that strong electric or magnetic fields deflected the canal rays and, in 1899, constructed a device with perpendicular electric and magnetic fields that separated the positive rays according to their charge-to-mass ratio (Q/m). (wikipedia.org)
  • Wien found that the charge-to-mass ratio depended on the nature of the gas in the discharge tube. (wikipedia.org)
  • The dry matter content of sample is calculated as the ratio of mass after to the mass before the drying. (wikipedia.org)
  • spectral
  • In 2005, the first metabolomics web database, METLIN, for characterizing human metabolites was developed in the Siuzdak laboratory at The Scripps Research Institute and contained over 10,000 metabolites and tandem mass spectral data. (wikipedia.org)
  • reagent
  • In such a determination, the lignin sample is dissolved using a mixture of DMF and pyridine (in excess for a quantitative reaction), in the presence of an internal standard (IS) and a relaxation reagent (RR), and then phosphitylated using a mixture of a derivatisation regent (DR) and deuterated chloroform. (wikipedia.org)
  • inert
  • Pyrolysis is a thermal decomposition of materials at elevated temperatures in an inert atmosphere such as a vacuum or nitrogen gas. (wikipedia.org)
  • sample
  • In simpler terms, a mass spectrum measures the masses within a sample. (wikipedia.org)
  • To determine the dry matter content, The sample is dried at a temperature of 105 °C ± 2 °C. The mass before and after the drying is determined gravimetrically. (wikipedia.org)
  • capillary
  • The gas chromatograph utilizes a capillary column which depends on the column's dimensions (length, diameter, film thickness) as well as the phase properties (e.g. 5% phenyl polysiloxane). (wikipedia.org)
  • instruments
  • By 1966 Finnigan and collaborator Mike Uthe's EAI division had sold over 500 quadrupole residual gas-analyzer instruments. (wikipedia.org)
  • A mass spectroscope configuration was used in early instruments when it was desired that the effects of adjustments be quickly observed. (wikipedia.org)
  • Methods
  • Two methods for qualitatively screening hazardous waste drum mixtures were described. (cdc.gov)
  • Devices, systems, and methods for separating an analyte from a mixture, and devices, systems, and methods for measuring an amount of an analyte are disclosed. (patentgenius.com)
  • One or more embodiments of the present invention generally relate to devices, systems, and methods for separating an analyte from a mixture. (patentgenius.com)
  • process
  • Thus, conceptually this can be thought of as a pneumatic process where the expanding solvent vapor is used as a nebulization gas. (wikipedia.org)
  • possibility
  • The use of the term mass spectroscopy is now discouraged due to the possibility of confusion with light spectroscopy. (wikipedia.org)
  • greater
  • Results show that vegetation ameliorated pesticide mixture 48-h sediment toxicity to H. azteca earlier and to a greater extent than non-vegetated constructed wetlands. (springer.com)
  • light
  • The original vascular structure of the wood and the pores created by escaping gases combine to produce a light and porous material. (wikipedia.org)