Zeolites as supports for the biorecovery of hexavalent and trivalent 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) ...

Pollution Prevention Technology Profile Trivalent Chromium Replacements for Hexavalent Chromium Plating

nano-rods zno as an efficient catalyst for the synthesis of chromene phosphonates, direct amidation and formylation of amines

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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...

I Fifteen Years of Outdoor Corrosion of Trivalent and Hexavalent Chromium Electrodeposits

hen the first trivalent chromium electroplating process was commercially introduced in the mid-l970s, information on the corrosion properties of the deposits and other physical properties was unknown. To obtain a comprehensive understanding about the corrosion properties of trivalent chromium electrodeposits over a variety of nickel deposits, chromium deposits from trivalent chromium electrolyt...