黄河三角洲表层土壤有机氯农药分布及生态风险评价

DISTRIBUTION OF ORGANOCHLORINE PESTICIDES IN SURFACE SOIL OF THE YELLOW RIVER DELTA AND ECOLOGICAL RISK ASSESSMENT

摘要: 利用GC-MS测定37个黄河三角洲表层土壤样品中的有机氯农药含量,揭示其中的有机氯农药残留特征,结果表明,HCHs的含量为0.04~1.19 ng/g,均值为0.47 ng/g,DDTs的含量为0.05~6 ng/g,均值为0.85 ng/g。多数站位β-HCH、DDE百分含量较高,表明可能来自土壤中农药残留,仅2个站位DDT/(DDE+DDD)>1,可能有新的农药输入。生态风险评价结果表明,该区有机氯污染的生态风险较低。

Abstract: Thirty-seven surface soil samples collected from the Yellow River Delta were analyzed for organchlorine pesticides (OCPs) residues. Data show that the contents of OCPs in the soil vary between 0.04~1.19ng/g (with a mean of 0.47ng/g) for HCHs, but 0.05~6ng/g (with a mean of 0.85 ng/g) for DDTs. High percentage of β-HCH、DDE in most sites indicates that they were from the pesticides residues in the soil. The ecological risk assessment suggests that the OCPs in the surface soil of this area remain at a low level and bear no environmental risk to human society.