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《Environmental Science》 2015-11
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Heavy Metals Pollution in Topsoil from Dagang Industry Area and Its Ecological Risk Assessment

ZHANG Qian;CHEN Zong-juan;PENG Chang-sheng;LI Fa-sheng;GU Qing-bao;State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences;College of Geoscience and Surveying Engineering,China University of Mining and Technology ( Beijing);College of Environmental Science and Engineering,Ocean University of China;  
Based on previous studies and field investigation of Dagang industry area in Tianjin,a total of 128 topsoil samples were collected,and contents of 10 heavy metals( As,Cd,Cr,Co,Cu,Pb,Ni,V,Zn and Hg) were determined. The geoaccumulation index and geostatistics were applied to examine the degree of contamination and spatial distribution of heavy metals in topsoil. The assessment on ecological risk of heavy metals was carried out using Hakanson's method,and the main resources of the heavy metals were analyzed as well. It was found that As,Cd and Co had the highest proportions exceeding Tianjin background value,which were100%,97. 66% and 96. 88%,respectively; the heavy-metal content increased to some extent comparing with that in 2004,and the pollutions of As and Cd were the worst,and other metals were at moderate pollution level or below. The ecological risks of heavy metals were different in topsoil with different land use types,the farmland soil in the southwest as well as soils adjacent to the industrial land were at relatively high potential ecological risk level,and the integrated ecological risk index reached up to 1 437. 37. Analysis of correlation and principal component showed that traffic and transportation as well as agricultural activities might be the main resources of heavy metals in the area,besides,the industrial activities in the region might also affect the accumulation of heavy metals.
【Fund】: 环境保护公益性行业科研专项(201309032)
【CateGory Index】: X53;X825
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