Determination of arsenic in foods by flow injection on-line sorption pre-concentration with hydride generation atomic fluorescence spectrometry |
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Authors: | N. Li G. Fang L. Zhao |
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Affiliation: | Key Laboratory of Food Nutrition and Safety, Ministry of Education , Tianjin University of Science and Technology , 29 The Thirteenth Road, Tianjin Economy and Technology Development Area, Tianjin, Tianjin 300457, China |
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Abstract: | A method was developed for the determination of total arsenic in foods using flow injection on-line sorption coupled with hydride generation atomic fluorescence spectrometry (HG-AFS) using a cigarette filter as the sorbent material. After reducing As(V) to As(III) by using L-cysteine, the determination of total arsenic was achieved through on-line formation and retention of the pyrrolidine dithiocarbamate arsenic complex (As(III)–PDC) on the cigarette filter, which was packed in the pre-concentration column and total arsenic was determined by HG-AFS. The analytes were eluted with 1.68 mol l?1 HCl from the sorbent material. With consumption of 22 ml of the sample solution, an enrichment factor of 25.6 was obtained at a sample throughput of 11.6 h?1. The detection limits (3 standard deviations) and the precision (relative standard deviation) in foods ranged from 2.5 to 9.9 ng g?1 and from 1.1 to 2.2%, respectively. The method was used to determine arsenic in carrot, mushroom, chicken tissue, cod fish, rice, common carp and shrimp. |
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Keywords: | arsenic hydride generation atomic fluorescence spectrometry (HG-AFS) cigarette filter flow injection foods |
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