Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1245592 | Talanta | 2008 | 6 Pages |
Abstract
A non-chromatographic, sensitive and simple analytical method has been developed for the determination of toxic arsenic species in vegetable samples by hydride generation-atomic fluorescence spectrometry (HG-AFS). As(III), As(V), dimethylarsinic acid (DMA) and monomethylarsonic acid (MMA) were determined by hydride generation-atomic fluorescence spectrometry using a series of proportional equations. The method is based on a single extraction of the arsenic species considered from vegetables through sonication at room temperature with H3PO4 1 mol Lâ1 in the presence of 0.1% (w/v) Triton XT-114 and washing of the solid phase with 0.1% (w/v) EDTA, followed by direct measurement of the corresponding hydrides in four different experimental conditions. The limit of detection of the method was 3.1 ng gâ1 for As(III), 3.0 ng gâ1 for As(V), 1.5 ng gâ1 for DMA and 1.9 ng gâ1 for MMA, in all cases expressed in terms of sample dry weight. Recovery studies provided percentages greater than 91% for all considered species in spiked samples of chards and aubergines. Total toxic As found in the aforementioned samples was at the level of 90 ng gâ1; As(III) is followed by As(V), DMA and MMA which are the main species of As in chards being As(V) the main As compound in aubergines.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Mariela N. Matos Reyes, M. Luisa Cervera, Reinaldo C. Campos, Miguel de la Guardia,