太湖底泥中多氯联苯的特征与环境效应

分析了太湖底泥中6种PCB同系物（PCB28、52、101、138、153、180），其中含量最高的为PCB52，平均为0.983 ng/g，最低为PCB138，平均为0.104 ng/g。表层底泥中，检出率最高的为PCB101，达100%，最低为PCB180，只有58.3%。太湖底泥的多氯联苯含量与底泥中有机质和营养元素几乎不相关，表明大气沉降可能是多氯联苯的重要来源。根据沉积物有关风险评价标准，太湖底泥测定的PCB总量尚未达到毒性评价的低值。尽管底泥中PCBs含量不高，但在底栖生物中可以富集，并通过食物链逐级传递，因而其潜在的危害性仍不容忽视。

CHARACTERISTICS AND ENVIRONMENTAL EFFECTS OF POLYCHLORINATED\=BIPHENYLS IN SEDIMENTS FROM TAIHU LAKE

Six PCB congeners were studied in 43 samples collected in February and August 2000 from Taihu Lake. Most of PCBs for six congeners are detectable in the sediment samples. Among them the concentration of PCB52 is the highest (average 0.983 ng/g), and that of PCB138 is the lowest (average 0.104 ng/g). No pattem was found in the distribution of PCBs in different areas of the lake. PCBs in the sediment samples collected from the center of the lake are not lower than that in other parts of the lake, suggesting that atmospheric transport and deposition can be the major input of PCBs to the lake. PCBs in sediments has nearly no correlations with the organic carbon and nutrient elements in the lake. Based on the sediment quality criteria, PCBs from all samples are lower than the low range of effects. But its potential hazard can not be neglectable as they enrich in organisms through benthic feeder.