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Title: Thermodynamics Metastability of Chromium (III) and Chromium Speciation in Natural Waters
Authors: Kumar, M Dileep
Reddy, C V G
Issue Date: Sep-1985
Publisher: NISCAIR-CSIR, India
Abstract: Oxidation state diagrams and volt-equivalent values revealed the metastability of Cr(2) and Cr(3) states in aqueous solutions. The study also showed the (i) higher stability of Cr(2) - organic complexes over dissolved Cr(2) and Cr(3) - inorganic complexes, (ii) strong tendency of Cr(3) to adsorb onto suspended particulate matter, (iii) feasibility of reduction of CrO4 2 species by organic ligands via complexation in natural waters, and (iv) predominance of Cr(OH)3 over Cr(OH)2 + above 40 plus or minus 1 degree C in seawater. Transformation of Cr(OH)2+ and Cr2 O7 2- (stable species in river water having pH 6 for Cr(3) and Cr(4) states, respectively) to Cr(OH)2 + and CrO4 2 (more stable species in seawater) occur during an estuarine mixing.
Page(s): 151-155
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Appears in Collections:IJMS Vol.14(3) [September 1985]

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