Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10561441 | Talanta | 2005 | 7 Pages |
Abstract
A rapid, sensitive and economic method has been developed for the direct determination of toxic species of arsenic present in fish and mussel samples. 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 without the need of a chromatographic previous separation. The method is based on the extraction of arsenic species from fish through sonication with HNO3 3 mol lâ1 and 0.1% (m/v) Triton and washing of the solid phase with 0.1% (m/v) EDTA, followed by direct measurement of the corresponding hydrides in four different experimental conditions. The limit of detection of the method was 0.62 ng gâ1 for As(III), 2.1 ng gâ1 for As(V), 1.8 ng gâ1 for MMA and 5.4 ng gâ1 for DMA, in all cases expressed in terms of sample dry weight. The mean relative standard deviation values (R.S.D.) in actual sample analysis were: 6.8% for As(III), 10.3% for As(V), 8.5% for MMA and 7.4% for DMA at concentration levels from 0.08 mg kgâ1 As(III) to 1.3 mg kgâ1 DMA. Recovery studies provided percentages greater than 93% for all species in spiked samples. The analysis of SRM DORM-2 and CRM 627 certified materials evidenced that the method is suitable for the accurate determination of arsenic species in fish.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Patricia Cava-Montesinos, Katja Nilles, M. Luisa Cervera, Miguel de la Guardia,