To reveal the pollution characteristics of heavy metals in agricultural soil contaminated by electric wastes generated in electric treating industry, 33 agricultural soil samples were collected around electric wastes at Longtang Town, Qingyuan City, Guangdong Province. The mass fraction, comprehensive pollution index and risk index of Cd, Cr, Cu, Pb, Zn and Ni in surface and profile soil were investigated to provide a basis for remediation and pollution prevention and cure of electric treating industry. The results indicated that Cd, Cu, Pb and Zn in surface soil (0~20 cm) are 1.40, 2.94, 1.25 and 1.28 times more than Environmental Quality Standard for Soils (GB19618─1995) which shows a surface enrichment feature whereas Cr and Ni were close to the Soil Environmental Background Value of Guangdong Province. Nemerow Pollution Index of research areas ranged from 1.42 to 18.29, with an average of 4.57 which reached severe pollution resulting aggravated potential hazards to safety of agricultural products. Cu, Pb, Zn and Ni in soils may originated from the same source for their highly significant correlation (P<0.01) while Cd, Cr may differ from different sources. Potential ecological risk of agricultural soil around electric waste was medium or high with risk index in the range of 275.56~596.47 mainly due to high potential ecological risk index of Cadmium. Descending order of risk index of heavy metals in research soil was Cd>Cu>Zn>Pb>Ni>Cr.%为揭示电子拆解行业产生的固体废物对周边农田土壤重金属的污染特征，选取广东省清远市龙塘镇的典型废渣为研究对象，在其周边农田中采集33个土壤样品，分析表层土壤与剖面土壤中Cd、Cr、Cu、Pb、Zn和Ni的质量分数、综合污染指数和潜在生态危害程度，以期为电子废物拆解行业的整治与污染防治提供依据。调查结果表明：Cd、Cu、Pb 和Zn在表层土壤（0~20 cm）中含量较高，呈现出表层富集型特征，其平均值分别是国家土壤环境质量二级标准的1.40、2.94、1.25和1.28倍，Cr和Ni含量则接近于广东省土壤重金属背景值。研究区域的内梅罗综合污染指数范围为1.42~18.29，平均值为4.57，达到重度污染，严重威胁农产品安全。土壤中Cu、Pb、Zn和Ni的来源可能相同，呈现出极显著相关（P<0.01），而Cd、Cr的来源可能不同于上述4种元素。废渣周边农田的潜在生态危害指数RI的范围为275.56~596.47，危害风险程度属于中等或强，这主要是由于Cd的潜在生态危害系数较大所致，6种重金属的潜在生态危害系数排序是Cd>Cu>Zn>Pb>Ni>Cr。
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机译：Pollution Characteristics and Ecological Risk Assessment of Polycyclic Aromatic Hydrocarbons in Agricultural Soils of Hohhot,China呼和浩特周边农田土壤中多环芳烃污染特征与生态风险评价
