Plant Soil Environ., 2003, 49(12):565-571 | DOI: 10.17221/4195-PSE

The influence of humic acid quality on the sorption and mobility of heavy metals

G. Barančíková, J. Makovníková
1 Soil Science and Conservation Research Institute, Prešov, Slovakia
2 Soil Science and Conservation Research Institute, Banská Bystrica, Slovakia

Mobile and potentially mobile forms of heavy metals are probably one of the most important toxic hazards in the environment. Besides pH, which is a factor influencing the mobility/availability of heavy metals to the greatest extent, the content and mainly the quality of soil organic matter play a very important role in the evaluation of heavy metal behaviour in the environment. The fraction of metals bound to organic compounds is exclusively associated with humic substances and particularly with humic acids (HA). A relationship between the parameters reflecting the actual structure of humic acids and mobile or potentially mobile fractions of heavy metals was studied in 12 soil localities representing different soil types. It can be stated on the basis of the acquired data that heavy metals tend to form complexes with soil organic matter that are different for each metal. The results suggest that copper is bound mainly in an unavailable form (significant correlations of fraction IV with HA parameters) and cadmium prefers exchangeable forms (significant correlations of fraction I with HA parameters) and is more available. It can be assumed on the basis Spearman's correlations that mobile fractions of cadmium are predominantly bound to the aliphatic part of humic substances, and copper prefers strong bonds to humic acids with a high degree of humification.

Keywords: humic acid parameters; cadmium; copper; sequential analysis

Published: December 31, 2003  Show citation

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Barančíková G, Makovníková J. The influence of humic acid quality on the sorption and mobility of heavy metals. Plant Soil Environ. 2003;49(12):565-571. doi: 10.17221/4195-PSE.
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