Speciation and bioavailability of heavy metals in paddy soil irrigated by acid mine drainage

• Published in: Huanjing kexue Vol. 30; no. 3; p. 900
• Main Authors: Xu, Chao, Xia, Bei-Cheng, Wu, Hai-Ning, Lin, Xiao-Fang, Qiu, Rong-Liang
• Format: Journal Article
• Language: Chinese
• Published: China 15.03.2009
• Subjects: Acids - analysis; Cadmium - analysis; Cadmium - toxicity; China; Copper - analysis; Copper - toxicity; Environmental Monitoring; Industrial Waste - analysis; Iron; Lead - analysis; Lead - toxicity; Metals, Heavy - analysis; Metals, Heavy - toxicity; Mining; Oryza - growth & development; Soil Pollutants - analysis; Soil Pollutants - toxicity; Water Pollutants, Chemical - analysis; China
• ISSN: 0250-3301

Based on field investigation and laboratory analysis, the speciation and bioavailability of the heavy metals (Cd, Cu, Pb, and Zn) was studied. These metals were tested from 16 soil samples taken from paddy soils irrigated by acid mine drainage in the lower stream of Dabaoshan mine area, Guangdong Province, China. The toxicity characteristic leaching procedure (TCLP) and three-step community bureau of reference (BCR) sequential extraction procedure methods were used to analyse the bioavailability of heavy metals. TCLP is currently recognized as an international method for evaluation of heavy metal pollution in soils. Two methods were compared in bioavailability by stepwise multiple linear regression analysis. Cd was dominated mainly by the acid-extractable and residual fractions, and followed by the order of acid-extractable > residual > oxidisable > reducible. Cu was dominated mainly by the residual fraction, and decreased in the following order: residual > reducible > acid-extractable > oxidisable. Pb was do