EXTRACTION STUDIES ON THE SYSTEM BETWEEN BIS(2-ETHYLHEXYL) PHOSPHORIC ACID AND CHROMIUM(III) IN SEVERAL AQUEOUS SOLUTIONS
作者:
P. Beneitez,
S. Ayllon,
期刊:
Solvent Extraction and Ion Exchange
(Taylor Available online 1987)
卷期:
Volume 5,
issue 4
页码: 597-609
ISSN:0736-6299
年代: 1987
DOI:10.1080/07366298708918583
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The extraction of chromium(III) by carboxylic acids and acidic organophosphorus compounds has been investigated. In general, chromium(III) was not extracted by carboxylic acids but the organophosphorus compound, di-2-ethylhexyl phosphoric acid, was found to be particularly adequate for the extraction. The partition of chromium(III) in nitrate medium and solutions of di-2-ethylhexyl phosphoric acid in Shellsol-T was studied using a tracer of 51cr. Distribution measurements of the metal ion in a wide range of pH and organophosphoric acid concentrations have been performed. The experimental data treated by a graphical method have been explained assuming the presence in the organic phase of the species Cr(DEHP)3(H2O)2(HDEHP). Equilibrium constants for the different extraction reactions are given. The extraction of the monomeric species was found to be independent of Ac−or SO=4ions presence.
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