温岭农业土壤中重金属的分布、来源及生态风险评价

摘要

采用电感耦合等离子体发射光谱法（ICP—AES）定量分析了温岭37个土壤样品中的Cu、Pb、Ni、Ag,As、Cd、Zn、Sn、Sb和Hg，并对其分布、来源及生态风险进行了评价。土壤中10种重金属的浓度范围在193．1-603．4mg／kg之间，平均值为265．2mg／kg。通过对照荷兰土壤标准限值和国家土壤质量二级标准，表明温岭地区土壤已经受到重金属的普遍污染。来源分析表明，温岭土壤中金属主要来源于工业活动、污水灌溉和农药施用等人类活动。对金属的生态风险评价表明，温岭为中等生态危害，对单个污染物的生态风险评价表明，Hg和Cd是主要的生态危害因子，应该受到重视。%The concentration of ten metals (Cu, Pb, Ni, Ag, ks, Cd, Zn, Sn, Sb and Hg) in the 37 soil samples of Wenling were determined by inductively coupled plasma emission spectrometry (ICP-AES), and their distribution, sources and potential ecological risk were evaluated. The total concentration of the 10 metals in the with the mean concentration 265.2 mg/kg. According to Dutch soil samples ranged from 193.1 mg/kg to 603.4 mg/kg, soil standard limits and the Secondary standard of national stand~ for quality, the soil of Wenling was generally polluted. The source analysis indicated that metals in Wenling soil came mainly from human activities such as industrial activities, sewage irrigation and pesticide application. Potential ecological risk assessment showed that the pollution level in Wenling was moderate, Hg and Cd were the major ecological risk factors, and should be taken seriously.