Distribution and Excretion of Chromium in Rats Injected with Trivalent and Hexavalent Chromium

Removal of Trivalent and Hexavalent Chromium by Seaweed Biosorbent

Protonated or Ca-form Sargassum seaweed biomass bound up to 40 mg/g of Cr(III) by ion exchange at pH 4. An ion-exchange model assuming that the only species taken up by the biomass was Cr(OH)2+ successfully fitted the experimental biosorption data for Cr(III). The maximum uptake of Cr(VI) by protonated Sargassum biomass at pH 2 was explained by simultaneous anion exchange and Cr(VI) to Cr(III) ...

Chronic toxicity studies. II. Hexavalent and trivalent chromium administered in drinking water to rats.

Acute toxicity of chromium by topical exposure or inhalation resulting in ulcerlike lesions has been recognized as an industrial hazard for many years. 1 Prolonged exposure to chromate mists has been suggested as contributing to the high incidence of lung cancer in certain industries.2•3 Acute poisoning by ingestion is.. well documented.4·5 Animal studies haYe also been made to determine sympto...

Pollution Prevention Technology Profile Trivalent Chromium Replacements for Hexavalent Chromium Plating

Urinary excretion of chromium as an indicator of exposure to trivalent chromium sulphate in leather tanning.

Two workers exposed to trivalent chromium sulphate in a leather tannery had high concentrations of chromium in the urine. The concentration of chromium showed a workshift-related diurnal fluctuation, but it was remarkably high even after a vacation, indicating accumulation of chromium in the body. The concentrations of chromium in the workplace air, as collected on filters using standard techni...

Carcinogenicity of hexavalent chromium.

Hexavalent chromium (Cr(VI)), a commonly used industrial metal, is a well known human lung carcinogen. Epidemiology and animal studies suggest that the particulate Cr(VI) compounds, specifically the water insoluble compounds, are the more potent carcinogens; however, the carcinogenic mechanism remains unknown. Here we summarize recent Cr(VI)-induced human tumour, in vivo, cell culture and in vi...