Solvent extraction of chromium(III) by salicylic, thiosalicylic, and phthalic acids

Sebastian, Dennis G.; Hilderbrand, David C.

doi:10.1021/ac50025a032

Cited by 4 publications

(2 citation statements)

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“…In acidic aqueous solutions, chromium(III) ion is present as [Cr(H2O)6] 3+ , which is inert compared with hydrated copper ions. The water-exchange rate constant (k,*,) for hexaquachromium(III) ion was 4.8 -50 x 10" 6 sec •' while k<,b, for the hydrated copper ion was 2x10* sec "' (Sebastin and Hilderbrand, 1978). Formation of chromium(III) complexes in aqueous solutions is very slow because water molecules in [Cr(H 2 O) 6 ] 3+ ion are not easily replaced by a hydrophobic ligand.…”

Section: Introductionmentioning

confidence: 99%

“…In a liquid-liquid extraction process, the chromium(III) complex is first precipitated by refluxing the mixture and then the complex is extracted into the Downloaded by [Florida State University] at 15:30 03 January 2015 chloroform phase (Sebastin and Hilderbrand, 1978). The extraction efficiency increased from 90.4 % to 97.4 % when the heating time was increased from 20 minutes to 60 minutes in mixed phthalic acid-thiosalicylic acid extraction at a pH of 3.0.…”

Section: Introductionmentioning

confidence: 99%

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Formation of chromium(III) complexes with 8‐hydroxyquinoline derivatives in nonionic micellar solutions

Wang

Martin

1998

Journal of Environmental Science and Health, Part A

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Due to the inertness of hydrated chromium ion, chromium(III) complexes are formed very slowly in aqueous solutions but not in surfactant solutions. Micelle effects were observed in the reaction of chromium(III) ion with 8-hydroxyquinoline or its derivatives. In nonionic surfactant solutions, reactions between chromium(III) ion and 8-hydroxyquinoline at 23 EC and 40 EC followed first-order kinetics. The reaction between chromium(III) ion and Kelex 100, 7-(4-ethyl-l-methyloctyl)-8-hydroxyquinoline, was zero order, and was much slower than the unsubstituted chelating agent. The rate of formation of the chromium(III)-Kelex 100 complex was dependent upon the surfactant concentration.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%