Journal ArticleDOI
Product speciation and aquation after the reaction of 51Cr(VI) with concentrated HCl or H2SO4
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In this article, the authors investigated the reaction of Cr(VI) in concentrated hydrochloric acid or concentrated sulfuric acid, as well as evaluate the products formed when complexing anions are present during the reaction.Abstract:
The present study was undertaken to investigate the reaction of Cr(VI) in concentrated hydrochloric acid or concentrated sulfuric acid, as well as to evaluate the products formed when complexing anions are present during the reaction. The results show that trace level Cr(VI) is rapidly reduced to Cr(III) in both 37% HCI and 98% H2SO4 in the absence of conventional reducing agents and that the initial products are, respectively, CrCl3(H2O)3 and Cr(H2O)2(SO4)2-}, which undergo slow aquation reactions at pH 1, giving Cr(H2O)63+.read more
Citations
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Chromatographic speciation of Cr(III)-species, inter-species equilibrium isotope fractionation and improved chemical purification strategies for high-precision isotope analysis.
TL;DR: These procedures significantly improve cation chromatographic purification of Cr over previous methods and allow for high-purity Cr isotope analysis with a total recovery of >95%.
Journal ArticleDOI
Speciation of aqueous chromium(VI) solutions with the aid of Q-mode factor analysis followed by oblique projection.
TL;DR: The composition of the Cr(VI) equilibria was estimated from the UV-vis spectra of dilute potassium dichromate solutions, without any prior knowledge of the quantities of pure components, with the aid of Imbrie Q-mode factor analysis (Q-mode FA) followed by Varimax rotation and Imbries oblique projection.
Journal ArticleDOI
Chromium removal using modified poly(4-vinylpyridinium) bentonite salts
TL;DR: In this article, a new composite material able to remove hexavalent chromium [Cr(VI)] ions from aqueous solutions was obtained by reacting poly(4-vinylpyridine) (P4VP) with bentonite clay [Bf].
Journal Article
A Radiochromatograpic Study Of The Reaction Of 51cro3 With Hydrochloric Acid
TL;DR: In this paper, the reduction of CrO 3 in concentrated hydrochloric acid, using 5 1 Cr as a tracer, was verified using a NaI(Tl) detector and a single channel analyzer.
Journal ArticleDOI
A radiochromatograpic study of the reaction of 51CrO3 with hydrochloric acid
TL;DR: In this paper, the reduction of CrO 3 in concentrated hydrochloric acid, using 5 1 Cr as a tracer, was verified using open column cation and anion chromatography.
References
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Chromium in the natural and human environments
Jerome O. Nriagu,Evert Nieboer +1 more
TL;DR: In this paper, Nieboer et al. studied the effect of Chromium toxicity on algae and bacteria in aquatic habitats and found that Chromium is toxic to algae and Bacteria.
Journal ArticleDOI
Reduction of hexavalent chromium in water samples acidified for preservation
TL;DR: Les echantillons d'eau preleves pour le dosage de Cr(VI) devraient etre filtres, refrigeres et analyses le plus rapidement possible.
Journal ArticleDOI
Column chromatographic speciation of chromium for Cr(VI) and several species of Cr(III)
K. E. Collins,Pierina Sueli Bonato,C. Archundia,Maria Eliana Lopes Ribeiro de Queiroz,Carol H. Collins +4 more
TL;DR: In this paper, a simple and effective cation exchange procedure for the separation of various of these species uses a small glass column containing 1 mL of pre-treated Cation exchange resin (Na+ form), stepwise elution with solutions of perchloric acid, Ca2+ (pH=2) and La3+(pH = 2) separates Cr(VI) and seven Cr(III) species from CrX3 to tetramer.
Journal ArticleDOI
Liquid chromatographic separation of aqueous species of Cr(VI) and Cr(III)
Carol H. Collins,Sérgio Henrique Pezzin,Jose Francisco Lugo Rivera,Pierina Sueli Bonato,Claudia Carvalhinho Windmoller,C. Archundia,Kenneth E. Collins +6 more
TL;DR: In this article, the authors give examples of characterizations involving Cr(VI) and several typical forms of Cr(III) using a cation-HPLC separation scheme with spectrophotometric or radiometric detection.
Journal ArticleDOI
Preservation of traces of chromium (VI) in water and waste water samples
TL;DR: In this paper, the lifetime of Cr(VI) as a function of pH, container material, initial concentration and temperature has been investigated in pure water solutions, and based on these results, a recommendation for the preservation of samples for the determination of chromium in water and waste water is made: by means of a preservation solution containing carbonate buffer (pH 9) and EDTA [for masking Cr(III)] losses of CrVI over 7 days could be reduced from 60-80% to less than 20%.