A Comparative Study of Extraction of Selenium(IV) Using Various Organic Solvents in Hydrochloric Acid Media

Tatsuya OSHIMA, Mai HASHIZUME, Naoki MATSUO, Yuki KAWAGUCHI, Kaoru OHE, Asuka INADA
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Abstract

To date, suitable organic solvents for the extraction of tetravalent selenium (Se(IV)) in highly concentrated hydrochloric acid have not been clarified systematically. In this study, the extraction of Se(IV) using various organic solvents was compared. Se(IV) was extracted from 8.0 mol/dm3 hydrochloric acid using various ketones. Se(IV) extraction using ethers was lower, while that using hydrocarbons was negligible. The correlation between the extraction and logP value of solvents was small, however, the extraction using a hydrophobic dicyclohexyl ketone was lower. The extractability of Se(IV) by most solvents can be classified with the Hansen solubility parameters of the solvents. However, Se(IV) extracted by 2-nonanone was not stripped by contact with fresh aqueous solutions containing HCl, HNO3, NaOH, or EDTA.

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盐酸介质中使用各种有机溶剂萃取硒(IV)的比较研究
迄今为止,用于在高浓度盐酸中萃取四价硒(Se(IV))的合适有机溶剂尚未得到系统的阐明。本研究对使用各种有机溶剂萃取 Se(IV) 进行了比较。使用各种酮类从 8.0 mol/dm3 盐酸中萃取 Se(IV)。使用醚的 Se(IV)萃取率较低,而使用碳氢化合物的萃取率可以忽略不计。萃取率与溶剂对数值的相关性很小,但使用疏水性二环己基酮的萃取率较低。大多数溶剂对 Se(IV)的萃取率都可以根据溶剂的汉森溶解度参数进行分类。然而,用 2-壬酮萃取的 Se(IV)与含有 HCl、HNO3、NaOH 或 EDTA 的新鲜水溶液接触后不会被剥离。
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