期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 425, 期 -, 页码 66-74出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2012.03.003
关键词
Multivariate analysis; Geostatistical analysis; Heavy metal; Agricultural soil
资金
- Agro-scientific Research in the Public Interest
- Ministry of Agriculture of the People's Republic of China [201003008]
- National Key Technology RD Program [2009BADB9B07]
An extensive survey was conducted in this study to determine the spatial distribution and possible sources of heavy metals in the agricultural soils in Shunyi, a representative agricultural suburb in Beijing, China. A total of 412 surface soil samples were collected at a density of one sample per km(2), and concentrations of As, Cd, Cu, Hg, Pb and Zn were analyzed. The mean values of the heavy metals were 7.85 +/- 2.13, 0.136 +/- 0.061, 22.4 +/- 631, 0.073 +/- 0.049, 20.4 +/- 52, and 69.8 +/- 16.5 mg kg(-1) for As, Cd, Cu, Hg, Pb, and Zn, respectively, slightly higher than their background values of Beijing topsoil with the exception of Pb. but lower than the guideline values of Chinese Environmental Quality Standard for Soils. Multivariate and geostatistical analyses suggested that soil contamination of Cd, Cu and Zn was mainly derived from agricultural practices. Whereas, As and Pb were due mainly to soil parent materials, and Hg was caused by the atmospheric deposits from Beijing City. The identification of heavy metal sources in agricultural soils is a basis for undertaking appropriate action to protect soil quality. (C) 2012 Elsevier B.V. All rights reserved.
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