上海市农用地土壤污染物现状调查与评价

Investigation and evaluation of soil pollutants in agricultural land in Shanghai

选取上海市4个区9个农用地进行土壤污染物现状调查,测试指标共计56项。结果显示土壤呈碱性,p H值7.53~8.61,氰化物、六价铬、多氯联苯、有机农药在所有样品中未检出,9项重金属、总石油烃检出率为100%。4个地区重金属铜、铅、镍检测结果均高于上海市背景值,金山区呈现最高。总石油烃含量范围为4~14 mg/kg,平均值为29.20 mg/kg,不同地块VOCs检出项目数为2~5种,检出物质主要为氯仿、1,1-二氯乙烯、1,1-二氯乙烷、苯系物等。SVOC中检出物质为苯并(a)芘和邻苯二甲酸二(2-乙基己基)酯(检出率为61.7%、含量范围为0.1~1.1 mg/kg)。上海市不同区农用地污染物含量均低于第一类建设用地限值,污染物类型和含量无显著性差异。

Nine plots of agricultural land in four districts of Shanghai were selected to carry out a survey on the status of soil pollutants, and a total of 56 indicators were tested.The results showed that the soil was alkaline and the p H value ranged from 7.53 to 8.61.Cyanide, hexavalent chromium, polychlorinated biphenyls and organic pesticides were not detected in all samples.The detection rate of 9 heavy metals and total petroleum hydrocarbon is 100%.The detection results of heavy metals copper, lead and nickel in the four regions were all higher than the background values in Shanghai, and jinshan district showing the highest.The detection contents of total petroleum hydrocarbons ranged from 4 to 14 mg/kg, with an average value of 29.20 mg/kg.The number of VOCs detected in different blocks was 2~5, and the detected substances were mainly chloroform,1, 1-dichloroethane,1, 1-dichloroethane and benzene series.The detected substances in SVOC are benzo(a) pyrene and di2-ethylhexyl phthalate(detection rate: 61.7%, content range: 0.1~1.1 mg/kg).The pollutant content of agricultural land in different districts of Shanghai is lower than the limit of the first type construction land.There was no significant difference in the types and contents of agricultural land pollutants in different districts.