A comparative study of methods for availability of Pb, Zn and Cd in polluted calcareous soils
1999
Zlatareva, E. | Nikolov, N. (N. Poushkarov Institute for Soil Science and Agroecology, BG-1080 Sofia (Bulgaria))
The availability of Pb, Zn and Cd in 24 soils (22 polluted and 2 not polluted) from an area located near a Pb and Zn smelted has been studied in a pot experiment with alfalfa. The content of Pb, Zn and Cd in the soils was measured using 7 methods of extraction and the results were correlated with the concentration of the elements in the second cut of alfalfa. The best correlation for Zn was found with the malate extraction (r=0.733). In the case of all soils the best correlation for Cd was found with MN4HCO3 + EDTA extraction (r=0.738). It is concluded that methods based on complexing agents are more successful in predicting availability of Pb, Zn and Cd in contaminated calcareous soils than the method based on extraction of total content, on acid dissolution and on ion exchange.
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