Selective cloud point extraction and preconcentration of trace amounts of silver as a dithizone complex prior to fame atomic absorption spectrometric determination

被引:125
作者
Manzoori, JL [1 ]
Karim-Nezhad, G [1 ]
机构
[1] Univ Tabriz, Fac Chem, Dept Analyt Chem, Tabriz, Iran
关键词
cloud point preconcentration; flame atomic absorption spectrometry; dithizone; Triton X-114; silver determination;
D O I
10.1016/S0003-2670(03)00343-X
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Dithizone (diphenylthiocarbazone) was used as a complexing agent in cloud point extraction for the first time and applied for selective preconcentration of trace amounts of silver. The analyte in the initial aqueous solution was acidified with sulfuric acid (pH < 1) and Triton X-114 was added as a surfactant. After phase separation, based on the cloud point separation of the mixture, the surfactant rich phase was diluted with tetrahydrofuran (THF) and the analyte determined in the enriched solution by flame atomic absorption spectrometry. After optimization of the complexation and extraction conditions, a preconcentration factor of 43 was obtained for only 10 ml of sample. The analytical curve was linear in the range of 3-200 ng ml(-1) and the limit of detection was 0.56 ng ml(-1). The proposed method was applied to the determination of silver in water samples. (C) 2003 Elsevier Science B.V All rights reserved.
引用
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页码:155 / 161
页数:7
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