Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10561426 | Talanta | 2005 | 5 Pages |
Abstract
Arsenic compounds including arsenous acid (As(III)), arsenic acid (As(V)), dimethylarsinic acid (DMA) and monomethylarsonic acid (MMA) were separated by high-performance liquid chromatography (HPLC) and detected by inductively coupled plasma mass spectrometry (ICP-MS). A Hamilton PRX-100 anionic-exchange column and a pH 8.5 K2HPO4/KH2PO4 5.0 Ã 10â3 mol Lâ1 mobile phase were used to achieve arsenic speciation. The separation of arsenic species provided peaks of As(III) at 2.75 min, DMA at 3.33 min, MMA at 5.17 min and As(V) at 12.5 min. The detection limits, defined as three times the standard deviation of the lowest standard measurements, were found to be 0.2, 0.2, 0.3 and 0.5 ng mLâ1 for As(III), DMA, MMA and As(V), respectively. The relative standard deviation values for a solution containing 5.0 μg Lâ1 of As(III), DMA, MMA and As(V) were 1.2, 2.1, 2.5 and 3.0%, respectively. This analytical procedure was applied to the speciation of arsenic compounds in drinking (soft drink, beer, juice) samples. The validation of the procedure was achieved through the analysis of arsenic compounds in water and sediment certified reference materials.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
N.M.M. Coelho, L.M. Coelho, E.S. de Lima, A. Pastor, M. de la Guardia,