黄浦江水相的新型有机氯农药污染特征分析

Pollution Status Analysis of Newly-used Organochlorine Pesticides in Huangpu River

该文研究了黄浦江17种新型有机氯农药的浓度分布特征并对其环境风险进行了评价。结果表明,在共22个水体样品中,除了四氯硝基苯、甲氧滴滴涕、喹氧灵3种新型有机氯农药未检出外,其他14种新型有机氯农药均有检出。所有水样中,新型有机氯农药的总浓度为0.272~0.924 ng/L(中值:0.467 ng/L),其中异啊恶草酮与啊恶草酮浓度较高。另外,啊恶草酮在黄浦江上游顺流向呈显著下降趋势,基本符合一级动力学,半衰期为36.87 h(R2=0.73,P=0.024)。黄浦江新型有机氯农药的生态环境风险熵RQ的平均值为0.0013,整体生态环境风险处于低水平。

This study investigated the concentration distribution characteristics and environmental risk assessment of 17 newly-used organochlorine pesticides in Huangpu River.In a total of 22 water samples,except for three newly-used organochlorine pesticides of Tecnazene,Methoxychlor and Quinoxyfen which were not detected,14 other newly-used organochlorine pesticides were detected.Concentrations of the all organochlorine pesticides ranged from 0.272 to 0.924 ng/L(median:0.467 ng/L)in all water samples,with higher concentrations of clomazone and oxadiazon.In addition,oxadiazon exhibited a significant and gradual downward trend in the upper reaches of the River,and the changing trend was basically in line with the first-order kinetics,with the half-life of 36.87 h(R2=0.73,P=0.024).The average ecological environmental risk coefficient(RQ)of newly-used organochlorine pesticides in Huangpu River is 0.0013,indicating that the overall eco⁃logical environmental risk is still at a very low level.