Soil Pollution Characteristics and Ecological Risk Assessment of As at a Large-scale Arsenic Slag-contaminated Site
(2.Department of Biology, Taiyuan Normal University , Taiyuan, China 030619)
(3.Yunnan Jingshangda Environmental Consulting Co., Ltd. , Kunming, China 650228)
(4.State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences , Beijing, China 100012)
【Abstract】A large-scale arsenic slag-contaminated site was selected to determine soil pollution characteristics and the degree of ecological risk of a large-scale contaminated site. In this study, 184 site soil samples, 101 agricultural soil samples, and 14 arsenic slag samples were collected, and the pollution characteristics and ecological risk of As were evaluated by using multivariate statistics, geostatistics, and the geo-accumulation and potential ecological risk index methods. The results show that the average As contents in site soil, agricultural soil, and arsenic slag are 1 333.0, 358.1, and 17 316.1 mg·kg−1, respectively. The degree of contamination of As exceeds the Grade III standard of environmental soil quality of China. The results of the vertical and three-dimensional distributions of contamination show that As is accumulated to different extents in different strata. The accumulation in the site surface soil is the most serious. The As concentrations in site soil samples are higher than that in agricultural soil samples. The potential ecological risk index method shows that all mean potential ecological risk indexes exceed 100 in different layers. Moreover, the percentage of samples in site and agricultural soils at medium pollution level is 58.21% and 61.39%, respectively, illustrating that the As pollution of soil samples from this contaminated site and surrounding farm areas is serious.
【Keywords】 large-scale contaminated site ; heavy metals; pollution assessment; ecological risk; distribution characteristics;
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