Proportion of Soil Remedies of the Lead-contaminated Soil in Guangxi

doi:10.11924/j.issn.1000-6850.2014-2172

Abstract

Abstract: In this paper, research of influence of different types of soil remedies on high lead-contaminated soils in Guangxi Huanjiang and Yangshuo was carried out. In view of the selected physical and chemical properties of soil, the effects of pH, total Pb, DTPA-Pb and H2O extractable-Pb in soil were studied by using water or DTPA one step extraction test. The results indicated that with the applied level increasing, the effects of different remedies on soil pH increased as the order: organic fertilizer ＞ ground phosphate rock ＞ calciummagnesia phosphate fertilizer ＞ lime, and phosphate rock powder and organic fertilizer could greatly improve the soil pH. Potassium dihydrogen phosphate and calcium superphosphate (high, medium and low) significantly reduced soil DTPA-Pb content by 32%-72% and 31%- 57%, respectively. By contrast, potassium dihydrogen phosphate had opposite effect on water soluble lead and increased water soluble lead content 1-3.4 times. Calcium superphosphate (high) significantly reduced water soluble lead content by about 88% . Organic fertilizer could reduce the amount of water soluble lead in the soil, and increase the leaching rate of DTPA. For tested soil S-1, lime, organic fertilizer and phosphate rock powder significantly reduced the amount of soil water extracted lead, soil water extracted lead content in low concentration treatment was higher than that in high concentration treatment; for tested soil S-2, organic fertilizer and phosphate rock powder significantly reduced water soluble lead content by 41%-55% with different applied concentrations.

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