Furthermore, most of the total Pb was enriched in coarse sand and clay, while its content was lower in fine sand and silt. The content of TCLP-Pb and available Pb (weak acid extraction and reducible Pb) significantly decreased by 71.60 and 25.12% respectively after the application of LP5 in the original soil. The content of DTPA-Pb was reduced with P5 by 65.27% and the percentage of available Pb decreased significantly in soil particles of the four sizes. The results showed that the single application of P5 and combined application of LP5 had optimum passivation efficiency. The characterization method of fine sand microstructure and mineral composition analysis was used. By passivation experiment in laboratory for 45 days, the passivation effect of the single and combined application treatments on exogenous Pb and partitioning characteristics were analyzed and compared. These soil passivators’ differential effects on total Pb and Pb with different chemical forms in soil particles of different sizes as well as Pb immobilization in soil were investigated. 1), goat manure, lime and phosphate were used to stabilize exogenous lead (Pb).
Study on the form partitioning and content of heavy metals in soil particles with different sizes is crucial for preventing and controlling heavy metals pollution, but few studies regard soil contaminated by heavy metals as a homogeneous body.
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