三正辛胺─CHC_(l3)萃取Cr(Ⅵ)的研究

Study of Extracting Chromium(Ⅵ) with Tri-n-octylamine-Chloroform

研究了三正辛胺－ＣＨＣｌ３从Ｈ２ＳＯ４溶液中萃取Ｃｒ（Ⅵ）．考察了各种影响萃取的因素，用多种方法联合确定萃合物的组成和萃取平衡机理，表明萃取过程属阴离子交换机理、揭示了Ｄｅｐｔｕｔａ等对 Ｃｒ（Ⅵ）萃取型体的异论。

The extraction of chromium (VI) with tri-n-octylamine-chloroform has been investigated. The effects of pH of the aqueous phase, total or(Ⅵ) and SO_4^(2-) concentration, extractant concentratiom, extractive time as well as temperature on this extraction process have been examined. The composition of extracted compound has been determined by saturation method, molar ratio method, equirnolar series method, as well as IR method. The extracted Cr(VI)species and the molar ratio of CrO_4^(2-) to Cr2O_7^(2-) in the extracted complexes also have been studied. An ion-exchange mechanism of extraction is discussed. Differing conclusions of Deptuta et al. for the species in extracted Cr(VI) are clarified.