辽河中下游水体中有机氯农药的残留调查

Organic chlorinated pesticides in middle and lower reaches of Liaohe

对辽河中下游水及沉积物中有机氯农药 (OCPs)进行了分析测定。由色谱测得的结果表明 ,水和沉积物中所检出的OCPs浓度分别为 7.5 9～ 34.98ng/L和 0 .45～ 7.2 6ng/g。水中OCPs的浓度与其他几个水体水中的浓度接近或略低。毓宝台大桥 (L0 2 )水中六六六 (HCHs包括 )明显高于其他站点 ,且α HCH所占比例与工业产品中该异构体比例基本接近 ,因此 ,在L0 2上游附近应有HCHs污染源存在。各个站点滴滴涕及其降解产物 (DDTs)在水和沉积物两相中的分配不均匀 ,且相差较大 。

Using GC, we analyze the organic chlorinated pesticides (ocps) in water and sediment of the middle and lower reaches of Liaohe. It shows that the concentrations of OCPs in water and sediment are 7.59～ 34.98ng/Land 0.45～7.26ng/g, respectively. The concentrations of OCPs in waters are nearly equal or slightly lower than that in several other waters in China. The concentration of HCHs of Yu Bao Tai Bridge (the samplings point 2) is obviously higher than that of other stations. And at this station the ratio of α-HCH to HCHs is very similar to the ratio in the product HCH. It exhibits that there should be a pollution point near the sampling point 2. The distributions of DDTs in water and sediment vary with high fluctuation at different sampling points, indicating non-uniformly distribution of suspended solids depositions.