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The schemes for fractionation of soil microelement compounds were analyzed. A scheme of extracting As compounds that are sorbed specifically and nonspecifically and bound with oxides (hydroxides) of Fe, Al, Mn, organic matter, carbonates, and soil minerals is proposed. The scheme differs from the existing ones in the higher selectivity of extracting the fractions due to changes in the combination of the extractants and the sequence of their use.
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Мотузова et al. (2006) studied this question.
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