A biokinetic model for trivalent or hexavalent chromium in adult humans

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) ...

Pollution Prevention Technology Profile Trivalent Chromium Replacements for Hexavalent Chromium Plating

Acute toxicity by water containing hexavalent or trivalent chromium in native Brazilian fish, Piaractus mesopotamicus: anatomopathological alterations and mortality.

This study evaluated the toxicity of hexavalent and trivalent compounds of chromium to the pacu, Piaractus mesopotamicus, in acute exposures of 96 h through mortality and histopathological responses. Hexavalent potassium dichromate was more toxic than trivalent compounds of chromium chloride, chromium oxide and chromium carbochelate. Sufficient mortalities occurred only with potassium dichromat...

Comparative toxicity of trivalent and hexavalent chromium V: Enzymatic alterations in rat liver and kidneys.

The effect of trivalent and hexavalent chromium compounds on the activities of selective hepatic drug metabolising enzymes and renal enzymes, in relation to the duration of exposure and tissue concentration of the metal in rats, was investigated to evaluate their potential toxicity. The activity of hepatic aniline hydroxylase decreased more markedly than that of amino N-demethylase on treatment...

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...