Plant Soil Environ., 2004, 50(8):339-345 | DOI: 10.17221/4041-PSE

Heavy metal distribution between fractions of humic substances in heavily polluted soils

L. Borůvka, O. Drábek
Czech University of Agriculture in Prague, Czech Republic

Soil organic matter is important in controlling heavy metal behaviour in soils. This study aims to determine the distribution of organically bound Cd, Pb, and Zn between humic and fulvic acids in 20 samples of heavily polluted Fluvisols. Traditional procedure of alkaline sodium hydroxide/pyrophosphate extraction of humic substances with consequent humic acids precipitation by acidification was used. All of the three metals were bound predominantly on fulvic acids (mean share was 98.4, 82.0, and 95.7% of total organically bound Cd, Pb, and Zn content, respectively). Mainly the level of pollution controlled the amount of metals bound on fulvic acids. On humic acids, a limited amount of specific sorption sites for the metals is expected. Lead content bound on humic acids was negatively correlated with soil pH. The results suggest relatively high potential mobility of organic fractions of heavy metals in soils under this study. The selectivity of alkaline extracting agent is briefly discussed.

Keywords: heavy metals; humic acids; fulvic acids; soil pollution; speciation

Published: August 31, 2004  Show citation

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Borůvka L, Drábek O. Heavy metal distribution between fractions of humic substances in heavily polluted soils. Plant Soil Environ. 2004;50(8):339-345. doi: 10.17221/4041-PSE.
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