Arc welding is a common unit operation in the construction industry, where frequent changes in location and welding position make it more difficult to control fume exposures than in industries where fixed locations are the norm. Welders may be exposed to a variety of toxic airborne contaminants including manganese (Mn) and hexavalent chromium (CrVI). Local exhaust ventilation (LEV) is a well-kn...

results the level of gsh significantly decreased. in contrast, the plasma level of mda significantly increased in a dose dependent manner in crvi-treated rats, when compared to control animals. simv had no effect on the biochemical parameters when compared to control rats, but significantly increased gsh concentration and decreased mda level in crvi-treated rats. materials and methods sixty-fou...

Although the genotoxic mechanism(s) of hexavalent chromium (CrVI) carcinogenicity remain to be fully elucidated, intracellular reduction of CrVI and concomitant generation of reactive intermediates including reactive oxygen species and subsequent oxidative damage to DNA is believed to contribute to the process of carcinogenesis. In the current study, substantial interindividual variation (7.19-...

The presence of hexavalent chromium water pollution is a growing global concern. Among the currently applied technologies to remove CrVI, its adsorption and photocatalytic reduction CrIII less mobile toxic forms are most appealing because their simplicity, reusability, low energy consumption. However, little attention has been paid bifunctional catalysts, that is, materials can reduce CrVI reta...

The aim of the present study was to provide new knowledge regarding effect non-expansive inert material addition on anionic pollutant removal efficiency in Fe0-H2O system. Non-disturbed batch experiments and continuous-flow-through column tests were conducted using CrVI as a redox–active contaminant three different systems: “Fe0 + sand”, only” ”sand only”. Both experimental procedures have adva...

Please include the attached comments on the Office ofEnvironmental Health Hazard Assessment's (OEHHA) draft CrVI public health goal (PHG) released for public comment in August 2009. We believe that these comprehensive comments address the many weaknesses in the proposed PHG requiring further evaluation and appropriate change to the proposed PHG at this time. We further believe that the now ongo...