期刊
ENVIRONMENTAL MONITORING AND ASSESSMENT
卷 184, 期 3, 页码 1645-1655出版社
SPRINGER
DOI: 10.1007/s10661-011-2067-x
关键词
Sludge; Heavy metal; Sequential extraction; Mobility; Principal component analysis
资金
- National Nature Science Foundation of China [50821002]
- National Water Pollution Control and Management Key Project [2009ZX07317-008]
- Key Projects in the National Science & Technology Pillar Program [2006BAC19B04]
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [2010DX17]
The analysis of heavy metals is very important for assessing the feasibility of the agricultural utilization for the municipal sludge. In this paper, a four-step sequential extraction method was applied to extract heavy metals (Cu, Zn, Mn, Cr, and Ni) in municipal sludges from seven individual wastewater treatment plants located in Jilin and Heilongjiang Province, China, for estimating the mobility and bioavailability of the metal ions in the agricultural application. The total concentrations of heavy metals and their chemical fractions after the sequential extraction were determined. Principal component analysis (PCA) was applied to analyze the relations of heavy metals fractions in the municipal sludges. Experimental results indicated that the total concentrations of Cu, Zn, Cr, and Ni in all sludge samples were below the threshold values set out by the Chinese legislation (GB18918-2002). Specially, Zn had a high bioavailability and mobility, Cu and Cr had potential bioavailability, while Mn mainly existed in the residual fraction of municipal sludge. On the other hand, Ni had different mobility in different municipal sludge. PCA results were confirmed by the environmental behavior of heavy metals.
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