A sensitive and selective method for determination of gold(III) based on electrothermal atomic absorption spectrometry in combination with dispersive liquid-liquid microextraction using dicyclohexylamine

TALANTA

卷:80

Article

Kagaya, Shigehiro¹  Takata, Daisuke¹  Yoshimori, Torajiro¹  Kanbara, Takaki²  Tohda, Koji¹ 

[1] Toyama Univ, Grad Sch Sci & Engn Res, Toyama 9308555, Japan

[2] Univ Tsukuba, Tsukuba Res Ctr Interdisciplinary Mat Sci, Tsukuba, Ibaraki 3058573, Japan

关键词: Gold(III);    Homogeneous liquid-liquid extraction;    Dispersive liquid-liquid microextraction;    Dicyclohexylamine;    Electrothermal atomic absorption spectrometry;   

DOI  :  10.1016/j.talanta.2009.09.037

来源: Elsevier

【 摘 要 】

A combined method with dispersive liquid-liquid microextraction (DLLME) and electrothermal atomic absorption spectrometry (ETAAS) has been developed for determining gold(III). Dicyclohexylamine, a new extractant for gold(III), showed excellent performance in DLLME. Acetone was indispensable to the quantitative extraction of gold(III), contributing to decrease in hydration, decrease in the difference in the dielectric constants between the Supernatant phase and the sedimented phase, and dissolution of a part of chloroform as an extraction solvent to the supernatant phase as well as improvement of dipersibility. In DLLME using a mixture of 1.0 mL of acetone and 100 mu L of chloroform containing 50 mmol L(-1) of dicyclohexylamine, gold(III) could be extracted selectively and effectively from 8 mL of a sample solution in the presence of iron(III), cobalt(II). nickel(II), copper(II). palladium(II), and platinum(IV) at pH 1. The extracted gold(III) was determinable by ETAAS: the detection limit was 0.002 mu g L(-1) (three times the standard deviation of the blank values, n = 8) as a gold(III) concentration in 8 mL of sample solution. The proposed method was applicable to the determination of gold in platinum metal and its alloy as well as effluent without any interference by the matrices. (C) 2009 Elsevier B.V. All rights reserved.

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