Distribution of cadmium and lead in dominant soil types in Slovakia
2001
Makovnikova, J. (Soil Science and Conservation Research Institute, Bratislava (Slovak Republic))_
Knowing about heavy metals bindings in a soil is the key to their evaluation from the point of soil vulnerability, bioavailability of metals as well as from the view of finding facilities and methods of manipulating their mobility. A methodical process of selecting sequential extraction has been used. Sequential extraction procedure according to Zeien and Brummer was developed for soils with higher redox potential and without higher content of carbonates. Heavy metals bindings were determined for a file of twenty-nine soils representing eight soil types. The soil samples were collected from the depth 0-0.1 m, there is the transport of heavy metals from soil into the plant very intense. Soil parameters were in the following ranges: pH (3.49 - 9.075), content of organic matter (0.86 - 13.7% of oxidizable carbon), content of cadmium (0.05 - 9.05 mg/kg), content of lead (9.3 - 1050 mg/kg). A mobile fraction, an easily mobile fraction, occluded on manganese oxides and coupled with organic mass, which both represent potentially bioavailable amount of metal has decreased in the order: cadmium (76.89%) lead (49.41% of total content). High rate of cadmium and lead in the mobile fraction was contained in Podzols and District Cambisol, low rate is characteristic for Haplic Chernozem, Rendzina and Chernozem what is in accordance with buffering potential of particular soil types to cadmium, lead and zinc
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