Bacterial-Assisted Immobilization of Lead in Soils : Implications for Remediation(Symposium 3.5.1 Heavy Metal Contaminated Soils,<Special Issue>International Symposium: Soil Degradation Control, Remediation, and Reclamation, Tokyo Metropolitan University

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A large number of sites throughout the world are contaminated by heavy metals, which represents a significant threat to both the environment and human health. Lead (Pb) contamination in particular can cause toxic effects to plants, animals, and humans. Lead reacts in soil through sorption, complexation, and precipitation processes, which lead to its immobilization in soil. This review examines the role of bacteria in the immobilization of Pb and includes a case study examining phosphate-solubilizing bacteria-assisted Pb immobilization using insoluble phosphate compounds. Soil bacteria are capable of directly and indirectly contributing to Pb immobilization by a number of mechanisms, including biosorption and accumulation of metals by bacterial cells, complexation by extracellular polymers and protein substances, and precipitation of Pb by phosphate, sulfide, hydroxide, or carbonate. In addition, phosphate-solubilizing bacteria ameliorate Pb toxicity by dissolution of insoluble rock phosphate and subsequent immobilization of Pb.
日本ペドロジー学会の論文