Sorption-x-ray fluorescence method for the determination of arsenic in water
Abstract
In many countries, researchers have found a clear correlation between the incidence and the content of arsenic in drinking water, therefore, the determination of arsenic in drinking water and food is a necessary and urgent task. A sorption-X-ray fluorescence method for the determination of arsenic (V) in waters based on the formation of molybdenum-arsenic heteropolyacid, its extraction in the form of an ionic associate with tri-n-octylamine on waxed cellulose filters and subsequent determination of arsenic by X-ray fluorescence spectroscopy is proposed. The dependence of the extraction on the nature and pore size of the filters has been established. It is shown that the formation of the analytical signal is influenced by the nature of the ion-pair reagent and the surface density of arsenic on the concentrator filter. The conditions for the extraction of arsenic (V) have been optimized. The detection limit of the proposed method, calculated according to the 3S criterion, was 1 μg, and taking into account the concentration ‒ 10 μg/L, which is significantly lower than the maximum permissible concentration in tap water.
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