摘要
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。
DDT and its metabolites （DDTs） and hexachlorocyclohexane isomers （HCHs） were determined in agricultural soils from North of Zhejiang Province. All methods were rigorously tested and adequate quality control was conducted. Statistical methods were used to study the distribution and contamination of HCH and DDT in the soils. The results showed the concentration of ∑HCHs and ∑DDTs in the soils ranged from 0.20-20.1 ng·g^-1 and 1.50-326.8 ng·g^-1 respectively, and the mean of them were 1.73 ng. g-~ and 44.68 ng·g^-1, respectively. It was found that ∑DDTs concentrations in some samples （19 out of 81） exceeded the official Chinese norms for DDT. Soil type was a significant factor for the difference of concentrations of HCH and DDT, while the organic carbon content showed a weak relativity with the residues. With a simple risk assessment, concentration of DDT was above the maximum permissible concentration for soils which is based on the bioaccumulation in terrestrial food webs.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2005年第6期1161-1165,共5页
Journal of Agro-Environment Science
基金
国家重点基础研究发展计划项目(2002CB410810)
