黄河头道拐断面水体中多氯联苯的季节性分布特征及源汇分析

根据黄河头道拐断面2008年4月—12月水环境的监测数据，分析了PCBs在该断面水体中的季节性分布特征及源汇。结果表明：头道拐断面∑PCBs各季度平均浓度呈夏季＞秋季＞春季＞冬季的变化特征，水体中PCBs各同系物的最大浓度大多出现在6、7、8月。PCB29和PCB98的浓度相对较高，这与我国曾大量生产低氯联苯相吻合。头道拐水体中PCBs的浓度与其他水体中PCBs的污染水平相比处于低值水平。PCBs的主要贡献源有历史残留，污废水的汇入，大气的干湿沉降作用，主要归宿是沉积物。

Seasonal Distribution Characteristics and Source-receptor Analysis of PCBs of the Yellow River in Toudaoguai of Inner Mongolia

According to monitoring data of the water environment of the Yellow River in April of 2008 to December of 2008 in Toudaoguai section. The results show that: A variation of ΣPCBs each quarter concentration in water in Toudaoguai was summer> fall > spring> winter. Abstract:maximum concentration of the homolue of PCBs mostly appear in june july and august in water. Concentration of PCB29 and PCB98 is relatively high in water.This is consistent with the production of low chlorinated biphenyls in China. The concentration of PCBs in water in Toudaoguai at a lower level compared with the others in water pollution levels of PCBs. The major contributing sources of PCBs are historical residues, sewage and waste import, atmospheric dry and wet deposition.The sediment is the main destination of PCBs in the water.