Occurrence and congeners specific of polychlorinated biphenyls in agricultural soils from Southern Jiangsu, China |
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Authors: | ZHANG Jian-ying QIU Li-min HE Ji LIAO Yuan and LUO Yong-min |
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Institution: | 1. ColleRe of Environmental and Resource Sciences,Zhejiang University,Hangzhou 310028,China 2. Soil and Environment Bioremediation Research Center,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China |
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Abstract: | A total of 198 agricultural soil samples were collected from Zhangjiagang and Changshu in Southern Jiangsu for analysis of 13 polychlorinated biphenyls(PCBs)in order to assess the levels of pollution,sources,area distribution,and potential risk for the environment.All methods were rigorously tested and an adequate quality control was ensured.Only one site had no PCBs residues,and the highest total PCBs concentration in the surface soils was 32.83 ng/g.The average concentration in all the soil samples was 4.13ng/g.signaling low-level pollution.Tetra-,penta-,and hexa-chlorinated biphenyls were dominant speoes in soil samples,accounnng for more than 75%of ΣPCBs in the soil samples.PCB118 was the most abundant congener in all the samples.The PCB118 Was about 20%of ΣPCBs.The soil organic matter content showed only a weak correlation with the levels of all PCB congeners,in which a better correlation was noted for the more volatile lighter PCB congeners than for the heavier homologues.To a certain extent,the sources and land use seemed to influence the levels of PCBs. |
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Keywords: | agriculture soil polychlorinated biphenyls(PCBs) congeners distribution Southern Jiangsu agricultural soils polychlorinated biphenyls specific land use influence extent better volatile soil organic matter content weak correlation congener signaling average concentration surface site residues |
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