Plant Soil Environ., 2007, 53(5):225-238 | DOI: 10.17221/2201-PSE

Relationship of soil properties to fractionation, bioavailability and mobility of lead and zinc in soil

N. Finžgar1, P. Tlustoš2, D. Leštan1
1 BiotechnicalFaculty, University of Ljubljana, Slovenia
2 Facultyof Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Czech Republic

Sequential extractions, metal uptake by Taraxacum officinale, Ruby's physiologically based extraction test (PBET) and toxicity characteristic leaching procedure (TCLP), were used to assess the risk of Pb and Zn in contaminated soils, and to determine relationships among soil characteristics, heavy metals soil fractionation, bioavailability and leachability. Regression analysis using linear and 2nd order polynomial models indicated relationships between Pb and Zn contamination and soil properties, although of small significance (P < 0.05). Statistically highly significant correlations (P < 0.001) were obtained using multiple regression analysis. A correlation between soil cation exchange capacity (CEC) and soil organic matter and clay content was expected. The proportion of Pb in the PBET intestinal phase correlated with total soil Pb and Pb bound to soil oxides and the organic matter fraction. The leachable Pb, extracted with TCLP, correlated with the Pb bound to carbonates and soil organic matter content (R2 = 69%). No highly significant correlations (P < 0.001) for Zn with soil properties or Zn fractionation were obtained using multiple regression.

Keywords: soil contamination; soil characteristics; potentially toxic metals; risk assessment

Published: May 31, 2007  Show citation

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Finžgar N, Tlustoš P, Leštan D. Relationship of soil properties to fractionation, bioavailability and mobility of lead and zinc in soil. Plant Soil Environ. 2007;53(5):225-238. doi: 10.17221/2201-PSE.
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