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浙北农田土壤中HCH和DDT的残留及其风险

Keywords: DDT,HCH,土壤,统计分析,风险评估

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Abstract:

通过采样及样品测试,分析了浙北平湖县和海盐县两地81个样点的农田土壤HCH、DDT及其代谢物的残留情况,采用数理统计方法研究了不同深度与不同土地利用方式的HCH、DDT残留。结果表明,HCH残留低于DDT,ΣHCHs介于0.20~20.1ng·g-1,平均值为1.73ng·g-1,ΣDDTs介于1.50~362.84ng·g-1,平均值为44.68ng·g-1;残留水平较高的是p,p′-DDE、p,p′-DDD和p,p′-DDT,平均值分别达到15.45、5.79和13.71ng·g-1,23.5%的表层土壤中的ΣDDTs超出了中国土壤环境质量标准的自然背景值。HCH、DDT残留与土地利用类型呈较好的相关性,水田土壤高于菜地土壤。浙北农田土壤中的HCH残留对于土壤生物的风险较低,而DDT对食物链高营养级生物具有一定的风险。

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