期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 175, 期 1-3, 页码 146-150出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2009.09.141
关键词
Cloud point extraction; Speciation analysis; Antimony; Food packaging materials; Electrothermal atomic absorption spectrometry
资金
- Natural Science Foundation of Henan University of Technology [2006 BS005]
A simple, sensitive method for the speciation of inorganic antimony by cloud point extraction combined with electrothermal atomic absorption spectrometry (ETAAS) is presented and evaluated. The method based on the fact that formation of a hydrophobic complex of antimony(III) with ammonium pyrrolidine dithiocarbamate (APDC) at pH 5.0 and subsequently the hydrophobic complex enter into surfactant-rich phase, whereas antimony(V) remained in aqueous solutions. Antimony(III) in surfactant-rich phase was analyzed by ETAAS after dilution by 0.2 mL nitric acid in methanol (0.1 M). and antimony(V) was calculated by subtracting antimony(III) from the total antimony after reducing antimony(V) to antimony(III) by L-cysteine. The main factors affecting the cloud point extraction, such as pH, concentration of APDC and Triton X-114, equilibrium temperature and incubation time, sample volume were investigated in detail. Under the optimum conditions, the detection limit (3 sigma) of the proposed method was 0.02 ng mL(-1) for antimony(III), and the relative standard deviation was 7.8% (c = 1.0 ng mL(-1), n = 7). The proposed method was successfully applied to speciation of inorganic antimony in the leaching solutions of different food packaging materials with satisfactory results. (C) 2009 Elsevier B.V. All rights reserved.
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