Abstract
The sorption of molybdoarsenic heteropoly acid (MAA) and its ion pair with tri-n-octylamine (TOA) on sorbents of different nature and hydrophobic filters has been studied. It is demonstrated that MAA is efficiently extracted on the polyacrylate sorbent Amberlyte XAD-8; the distribution coefficient of arsenic is 1 x 104 cm3/g for the sorption from 0.35-1.5 M H2SO4. Conditions of the quantitative extraction of MAA in the presence of TOA on thin-layer cellulose triacetate filters are found. A procedure is proposed for the sorption-X-ray fluorescence determination of arsenic in potable water. The detection limit of arsenic is 10 Μg/L for the sorption from 100 mL of a solution.
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