Determination of ultratrace gallium in river water by electrothermal atomic absorption spectrometry after preconcentration with solvent extraction and back extraction

被引：19

作者：

Kawaguchi, H ^{[1
]}

Shimizu, T ^{[1
]}

Shirakashi, T ^{[1
]}

Shijo, Y ^{[1
]}

机构：

[1] Utsunomiya Univ, Fac Engn, Dept Appl Chem, Utsunomiya, Tochigi 3218585, Japan

来源：

BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN | 1998年 / 71卷 / 03期

关键词：

D O I：

10.1246/bcsj.71.647

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A method for the determination of gallium at ng dm(-3) levels in river water is described. Gallium is extracted into carbon tetrachloride as an ion pair of gallium-5-sulfo-8-quinolinol (H(2)QS) chelate anion with tetradecyldimethylbenzylammonium chloride (Zephiramine), and subsequently back-extracted into 0.3 cm(3) of a nitric acid solution. The high efficiency of extraction and back extraction allows gallium to be concentrated about 5000-fold with a combined single extraction and back extraction. The back-extracted solution, containing 250 mu g cm(-3) of nickel as a matrix modifier, is suitable for the determination of gallium by electrothermal atomic absorption spectrometry (ETAAS). The detection limit (3 sigma) for gallium is 0.29 ng dm(-3) based on a 1500-fold preconcentration. The concentration of dissolved gallium in river water was found to be 5.3-9.2 ng dm(-3) by the proposed method.

引用

页码：647 / 650

页数：4

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