期刊
ENVIRONMENTAL EARTH SCIENCES
卷 68, 期 5, 页码 1331-1348出版社
SPRINGER
DOI: 10.1007/s12665-012-1831-8
关键词
Mining pollution; Land use; Karst terrain; Principal component analysis
资金
- National Basic Research Program of China [2004CB418507]
- National Natural Science Fund of China [40861024]
- Guangxi Scientific and Technological Brainstorm Project, Science and Technology [Guikegong 0779011]
A study of agricultural lands around an abandoned Pb-Zn mine in a karst region was undertaken to (1) assess the distribution of heavy metals in the agricultural environment, in both dry land and paddy field; (2) discriminate between natural and anthropogenic contributions; and (3) identify possible sources of any pollution discovered. Ninety-two samples of cultivated soils were collected around the mine and analyzed for eight heavy metals, pH, fluoride (F-), cation exchange capacity, organic matter, and grain size. The eight heavy metals included Cd, Cr, Cu, Ni, Pb, Zn, As, and Hg. The average concentrations (mg/kg) obtained were as follows: Cd 16.76 +/- A 24.49, Cr 151.5 +/- A 18.24, Cu 54.28 +/- A 18.99, Ni 57.5 +/- A 14.43, Pb 2,576.2 +/- A 1,096, Zn 548.7 +/- A 4,112, As 29.1 +/- A 6.36, and Hg 1.586 +/- A 1.46. In a site where no impact from mining activities was detected, the mean and median of Cd, Cu, Ni, Pb, Zn, As, and Hg concentrations in investigated topsoils were higher than the mean and median of heavy metal concentrations in reference soils. An ensemble of basic and multivariate statistical analyses was performed to reduce the multidimensional space of variables and samples. Two main sets of heavy metals were revealed as indicators of natural and anthropogenic influences. The results of principal component analysis (PCA) and categorical PCA demonstrated that Cd, Cu, Pb, Zn, and Hg are indicators of anthropogenic pollution, whereas Cr, As and Ni concentrations are mainly associated with natural sources in the environment. The contamination from Pb-Zn mining operations, coupled with the special karst environment, was a key contributing factor to the spatial distribution of the eight heavy metals in the surrounding soil. The values of heavy metals in the soil samples suggested the necessity of conducting a rigorous assessment of the health and environmental risks posed by these residues and taking suitable remedial action as necessary.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据