2013•Physical Testing and Chemical AnalysisRequires access
AFS Determination of Arsenic,Antimony and Mercury in Leather and Its Products with Microwave Assisted Sample Digestion
Zhu ZhongWu
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Abstract
AFS was applied to the determination of As,Sb and Hg in leather and its products.The sample was digested with mixed solution of HNO3-H2O2,and reduced with mixed solution of thiourea and ascorbic acid.Hydrides of the 3 elements were generated from acidic solution using NaBH4 solution(dissolved in NaOH solution) as reducing reagent.Flow-rates of the carrier gas selected were 300 mL·min-1 for As and 400 mL·min-1 for Sb and Hg.Linear relationships between values of fluorescence intensity and mass concentration of the 3 elements were found in definite ranges,with detection limits(3s/k) of 0.22 μg·L-1(for As),0.16 μg·L-1(for Sb) and 0.04 μg·L-1(for Hg).The proposed method was applied to the analysis of leather and its products,giving values of recovery in the range of 94.0%-107% with RSD′s(n=5) less than 10%.