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  • adsorption
  • Chromate (CrO 4 2- ) adsorption was investigated on kaolinite (0.2-2 µm) saturated with NaClO 4 over a range of pH. (clays.org)
  • Adsorption increased with decreasing pH because of protonation of chromate and/or variable charge sites on kaolinite. (clays.org)
  • Chromate adsorption at different sorbate and sorbent concentrations increased below the pH zpc for the kaolinite edge, suggesting the formation of weak surface complexes. (clays.org)
  • The adsorption of both chromate and sulfate can be described in terms of a site-binding model of the kaolinite edge, in which the edge is viewed as composite layers of Al and Si oxide. (clays.org)
  • Surface complexation constants for CrO 4 2- on kaolinite were similar to those for alumina, pointing to the importance of Al-OH edge sites in chromate adsorption. (clays.org)
  • salts
  • Most of be emphasis is centered on the traditional metal oxides, such as chromate or permanganate salts, in spite of the hazards and waste management concerns associate with them. (thefreedictionary.com)
  • 2000
  • However, there was significant negative publicity surrounding chromates wrought in 1993 by Erin Brokovich and the subsequent dramatisation of events in the eponymous 2000 movie. (spectroscopynow.com)
  • viable
  • From the results we have so far, I am certain that we can develop a viable treatment for former industrial sites where chromate compounds are a problem," said Dr Stewart. (thefreedictionary.com)
  • The main obstacle until now for finding a viable replacement is that chromate coatings can "self heal" if they are damaged or scratched whereas no previous alternative has had that property. (spectroscopynow.com)
  • lead
  • All units are phosphate washed, caulked with polyurethane sealant to prevent rust in seams, and painted with an epoxy primer using an acrylic enamel paint that is lead and chromate free. (thefreedictionary.com)
  • Lead scientist Dev Chidambaram, who has built on fourteen years work to develop the coating, explains that, "There is no question that this will be able to replace the chromate-based coating. (spectroscopynow.com)
  • Return to Lead chromate . (mfa.org)
  • GETEX has completed a two-month project on the former RAN destroyer, HMAS VAMPIRE, surveying it for asbestos, lead paint and chromate-based paints and managing asbestos removal. (ferret.com.au)
  • DATA
  • CONCLUSIONS: These data illustrate that repetitive exposure to particulate chromate induces chronic injury and an inflammatory microenvironment that may promote Cr(VI) carcinogenesis. (thefreedictionary.com)
  • replace
  • The coating could replace chromate coatings, which have been used in aerospace and other applications for more than half a century. (spectroscopynow.com)
  • Materials scientists have been attempting to find ways to replace chromate coatings with non-toxic alternatives since the 1980s. (spectroscopynow.com)
  • process
  • Our results suggest a novel process where the in situ microbial production of hydrogen is directly coupled to the catalytic bio-Pd mediated reduction of chromate. (rti.org)
  • feature
  • All units feature V-shaped chromate treated condensers and low noise fans (2dBA less than R22 models), double antifreeze protection and optimum water distribution. (thefreedictionary.com)