电厂运营初期温排水口沉积物中多环芳烃的监测和来源分析

Study on Characteristics and Sources of Polycyclic Aromatic Hydrocarbons(PAHs)in Sediments near the Warm Outlet of a Power Plant during Trial Operation

直接采用海水作为冷却水是沿海电厂主要的冷却方式,但由于浮游生物残体的富集作用可能导致局部海域有机污染物含量的增加。本研究在湛江湾某电厂运行初期对温排水口沉积物中PAHs的含量和来源进行监测和风险评估,为探讨海水冷却水对邻近海域有机污染物的影响提供比对资料。结果显示:15种PAHs的总含量为(43.18~133.06)ng/g,均值为80.53ng/g,Phe、Fla、Pyr和BbF是主要PAHs;特征分子比值和主成分分析表明沉积物中PAHs主要来自燃烧源和石油源;沉积物质量基准法(SQGs)显示监测海域沉积物PAHs的生态风险水平低。

Seawater is often used as cooling water for coastal power plant,but the enrichment of plankton residue may lead to the increase of organic pollutants in local sea areas.In this study,the content and source of PAHs in sediments from the warm discharge outlet of a power plant in Zhanjiang Bay were monitored and evaluated at the initial stage of operation,so as to provide background data for examing the influence of the warm discharge of the power plant on organic pollutants in adjacent sea areas.The results showed that the total content of 15 PAHs ranged from 43.18ng/g to 133.06ng/g,with an average of 80.53ng/g,and Phe,Fla,Pyr and BbF were the dominated PAHs.The characteristic molecular ratios and principal component analysis showed that PAHs in sediments were mainly from combustion sources and petroleum sources.Sediment quality reference method(SQGS)showed that the ecological risk level of PAHs in the monitored Marine sediments was low.