LIQUID-LIQUID-EXTRACTION BEHAVIOR OF INORGANIC AND ORGANIC-ANIONS WITH COLOR-CHANGEABLE NEUTRAL EXTRACTANTS

被引：4

作者：

KUBOTA, H

MOTOMIZU, S

机构：

[1] Department of Chemistry, Faculty of Science, Okayama University, Okayama 700, Tsushimanaka

来源：

ANALYTICAL SCIENCES | 1990年 / 6卷 / 05期

关键词：

extraction behavior; ion associates; N; N-Dimethylaminophenylazoquinoline; parameter of ion extractability; spectrophotometry;

D O I：

10.2116/analsci.6.737

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Color-changeable extractants for acids, acidophores, were synthesized and examined; they were 4-(N,N-dimethylaminophenylazo)-pyridines and quinolines. The fundamental physicochemical constants for the acidophores and their ion associates were determined by spectrophotometry. The liquid-liquid distribution was carried out between an aqueous phase and a chloroform phase. A parameter of the extractability of the protonated cations of the acidophores and of several inorganic and organic anions as ion associates was determined on the basis of the assumption that the extraction constant of an ion association complex, log Kex, is divided into a cationic and an anionic contributions, C and A, respectively. The order of the extractability of the anions was: Br-<I-<ClO4<SCN-<Pic-<(Ethyl Orange)-<C12H25-OSO3. Anionic surfactants could be quantitatively extracted into chloroform with 4-(4-N,N-dimethylaminophenylazo)-2-methylquinoline: the molar absorptivity was 4.5×104 1 mol-1 cm-1 at 560 nm. The acidophores once used could be recycled and be used repeatedly. © 1990, The Japan Society for Analytical Chemistry. All rights reserved.

引用

页码：737 / 745

页数：9

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