Assessment of the Remediation Effect of Nano-hydroxyapatite in Exogenous Pb-contaminated Soil Using Toxicity Characteristic Leaching Procedure and Soil Enzyme Activities.

Autor: Liang, Shu-xuan1 liangsx168@126.com, Ding, Ling1, Shen, Shigang1, Liu, Wei1, Li, Jianbing2, Xi, Xiaocan1
Předmět:
Zdroj: Bulletin of Environmental Contamination & Toxicology. Aug2018, Vol. 101 Issue 2, p250-256. 7p. 1 Chart, 5 Graphs.
Abstrakt: Lead (Pb) is one of the most abundant metal soil pollutants. In this research, effects of nano-hydroxyapatite (NHAP) on remediation of Pb-contaminated soil were evaluated by the measure of extractable Pb using toxicity characteristic leaching procedure (TCLP) and soil enzyme activities. Results suggested NHAP significantly decreased the concentrations of extractable Pb, achieving the maximum decrement rate of 75.71%. Activity of urease decreased with increasing Pb concentrations. Moreover, activities of alkaline phosphatase, dehydrogenase, and catalase increased at the lower Pb levels and decreased at the higher Pb levels. NHAP had a positive effect on regulating soil enzymes. Thus, soil enzyme activities, especially dehydrogenase, could be used as biological indicators of Pb pollution and NHAP remediation. Moreover, NHAP could reduce the mobility and bioavailability of Pb, while increasing enzyme activities, thereby lowering the leaching risk and biotoxicity of Pb. [ABSTRACT FROM AUTHOR]
Databáze: GreenFILE
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