Abstract
The potentiometric titration of water extracts from the upper horizons of taiga-zone soils by salt solutions of heavy metals (Pb, Cu, and Zn) showed that their addition is an additional source of the extract acidity because of the involvement of the metal ions in complexation with water-soluble organic substances (WSOSs). At the addition of 0.01 M water solutions of Al(NO3)3 to water extracts from soils, Al3+ ions are also involved in complexes with WSOSs, which is accompanied by stronger acidification of the extracts from the upper horizon of soddy soils (with a near-neutral reaction) than from the litter of bog-podzolic soil (with a strongly acid reaction). The effect of the Al3+ hydrolysis on the acidity of the extracts is insignificantly low in both cases. A quantitative relationship was revealed between the release of protons and the ratio of free Cu2+ ions to those complexed with WSOSs at the titration of water extracts from soils by a solution of copper salt.
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Original Russian Text © G.V. Motuzova, I.P. Makarychev, M.I. Petrov, 2013, published in Pochvovedenie, 2013, No. 1, pp. 48–55.
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Motuzova, G.V., Makarychev, I.P. & Petrov, M.I. Effect of aluminum, zinc, copper, and lead on the acid-base properties of water extracts from soils. Eurasian Soil Sc. 46, 44–50 (2013). https://doi.org/10.1134/S1064229313010067
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DOI: https://doi.org/10.1134/S1064229313010067