京杭大运河（徐州铜山段）沉积物表层样品中有机氯农药残留状况

京杭大运河(徐州铜山段)位于南水北调东线工程路线上,利用GC-ECD检测了该段河流7个断面上的沉积物样品中的有机氯农药含量,主要检测出六六六(HCHs)、滴滴涕(DDTs)、六氯苯等.结果表明,总有机氯农药含量范围是57.80～236.65 ng·g~(-1),其中HCHs、DDTs的含量较高,分别为12.19-43.08 ng·g~(-1)和3.29～135.08 ng·g~(-1),从蔺家坝到解台闸沿程沉积物中有机氯农药的含量呈下降的趋势,显示有机氯农药的残留物可能主要来自于农田壤的残留,并且近期无新的污染源输入.

Residual State of Organocldorine Pesticides in Surface Samples of Sediments from Beijing-Hangzhou Grand Canal(Tongshan Xuzhou Section)

Beijing-Hangzhou Grand Canal is located in the Eastern Route Project for Transferring Water from Southern to Northern China, the water quality of it directly affects the transferring water quality. Organochlorine pesticides (OCPs ) in seven sediment samples from Beijing-Hangzhou Grand Canal(Tongshan Xuzhou section) were analyzed by GC-ECD in this paper. The OCPs detected were comprised mainly of HCHs, DDTs, hexachlorobenzene etc. The range of total OCPs concentration was 57.80～236.65 ng·g~(-1). The concentrations of HCHs and DDTs were much higher than the other compounds and varied from 12.19～43.08 ng·g~(-1) and 3.29～135.08 ng·g~(-1), with the average of 24.69 ng·g~(-1) and 32.25 ng·g~(-1), respectively. Contamination level of OCPs in sediments decreased from Linjia Dam to Xietai Gateway. Compared with the foreign and national rivers, concentrations oT HCHs and DDTs in sediments from Beijing-Hangzhou Grand Canal (Tongshan Xuzhou section) were higher, which illustrated that the contamination of OCPs was serious in Beijing-Hangzhou Grand Canal (Tongshan Xuzhou sec-tion). And the results indicated that the residue of OCPs might mainly come from the use of pesticide in agriculture in history and the soil of farmland, and there was no new pollution source into the river recently.