摘要
对东江干、支流(各5个采样点)沉积物中16种PAHs含量进行检测,结果表明:干流沉积物中16种PAHs的含量范围为473.41~892.32ng/g(均值为701.18ng/g),支流沉积物中16种PAHs含量范围为113.16~3055.02ng/g(均值为1413.24ng/g)。干、支流沉积物中PAHs以三环、四环的菲和荧蒽为主。荧蒽/(荧蒽+芘)与茚并(1,2,3-cd)芘/(茚并(1,2,3-cd)芘+苯并(g,h,i)芘)比值显示,东江流域主要受木材、煤炭及石油燃烧影响比较大。风险评价表明东江流域干、支流沉积物PAHs所致的生态风险处于可接受的水平。
16 polycyclic aromatic hydrocarbons(PAHs) were measured in sediments from main stream and tributary in Dongjiang river. The total PAH concentrations varied from 473.41 to 892.32 ng/g(average701.18ng/g) in main stream and 113.16 to 3055.02 ng/g(average 1413.24 ng/g). It showed that the main contributors of 3 ring and 4 ring respectively were phenanthrene and fluoranthene. Based on fluoranthene/(fluoranthene+pyrene) and Icd P/(Icd P+Bghi P) ratios, the main sources of PAHs were wood combustion, coal combustion and oil combustion. Risk assessment indicated that it was acceptable level in sediments ofmain stream and tributary in Dongjiang river.
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