对杭埠-丰乐河12个采样点的表层沉积物中16种优控多环芳烃(PAHs)的含量进行了测定.结果表明:16种PAHs均被普遍检出,总含量(∑PAHs)范围为71.3±15-3372±402 ng· g-1干重(dw),平均值为938 ng·g-1(dw),与国内主要河流相比其浓度处于中等水平.底泥中多环芳烃组成以4环和5环为主,共占∑PAHs的81％,其中,二苯并[a.h]蒽(DBA)浓度最高,平均浓度为254 ng·g-1.底泥总有机碳(TOC)与∑PAHs之间有良好线性关系.利用特征比值法和主成分分析探讨了PAHs的可能来源,结果显示,杭埠-丰乐河底泥中PAHs主要来自于流域周边居民生物质、煤燃烧及汽车燃油污染.利用沉积物质量基准法和苯并[a]芘毒性当量(TEQBaP)法分别评价了杭埠-丰乐河沉积物PAHs的生态风险和致癌风险,发现部分采样点某些多环芳烃含量超过了效应区间低值(ERL),具有潜在的生态风险;沉积物中TEQBap均值高达343 ng· g-1,具有相当高的致癌风险.
In the present study,the concentrations of 16 priority PAHs in surface sediments from 12 sites of Hangbu-Fengle River were determined.The sixteen types PAHs were all detected in the sediment samples.The concentration of PAHs varied from 71.3±15 to 3372±402 ng·g-1 dry weight (dw) and the average was 938 ng·g-1(dw),which suggested the pollution status was in the medium level compared with other major rivers and lakes in China.The composition of PAHs showed that 4 and 5 ring PAHs were predominant,which accounted for 81％ ∑PAHs.Dibenzo[a,h] anthrancene (DBA) was the most abundant PAH compound in the sediments,with an average concentration of 254 ng· g-1(dw).There was a linear correlation between ∑PAHs.concentrations and sediment TOC contents.Using characteristic ratio method and principal component analysis,the potential sources of PAHs were analyzed.Results suggested the PAHs in sediments from Hangbu-Fengle River were mainly from coal and wood combustions,gasoline and diesel emissions.The ecological risk and carcinogenic risk of PAHs in sediments from Hangbu-Fengle River were assessed by sediment quality guideline and the total toxic benzo[a] pyrene equivalent (TEQBap).Results demonstrated that some of PAHs exceeded ERL several sample sites,which has the potential ecological risk.The calculated TEQBaP was 343 ng·g-1,suggesting high potential risk from the sediments.
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