海河河口表层沉积物中PCBs和OCPs的源解析

采集海河河口表层沉积物样品,测定了其中12种多氯联苯(PCBs)和20种有机氯农药(OCPs)的浓度,运用主成分分析-多元线性回归法(PCA-MLR)解析该区域沉积物中PCBs和OCPs的来源,并定量计算了各污染源的贡献量.结果表明,海河沉积物中PCBs的特征源为非故意产生和大气输送2类,基于多元线性回归法的贡献率分别为55%和45%,对PCBs总量的贡献量均值为6.94,9.42ng/g;OCPs的特征源为历史残留和新的输入2类,贡献率分别为13%和87%,对OCPs总量的贡献量均值为21.18,171.97ng/g.海河河口沉积物中POPs的源贡献与该区域的工业生产有关,改善工业结构和妥善处理历史遗留的生产废物是控制海河河口沉积物中POPs的有效途径.

Source apportionment of polychlorinated bipheuyls and organoehlorine pesticides in surface sediments of Haihe Estuary

Principal component analysis and multiple linear regression were applied to apportion sources of PCBs and OCPs in surface sediment of Haihe Estuary, China, based on the concentrations of PCBs and OCPs in 29 surface sediment samples. For PCBs, two factors were identified representing: unintentional produce and long-range air transmission. The contributions based on multiple linear regression of major sources were quantified as 55% for unintentional produce and 45% from air transmission. The mean contribution concentration of the two sources were 6.94ng/g and 9.42ng/g, respectively. For OCPs, two factors were identified representing used residue and input of new OCPs. The contributions based on multiple linear regression of major sources were quantified as 13% for used residue and 87% for new input of OCPs, and the mean contributions concentration of the two source were 21.18ng/g and 171.97ng/g, respectively. It is concluded that PCBs and OCPs in the surface sediment have close relations with the commercial production in the area, which means the improvement of the industrial structure and treatment of the produce waste residue are the keys to reduce the PCBs and OCPs pollution in surface sediment of Haihe estuary.