【摘要】 考察第二松花江表层沉积物中16种多环芳烃类化合物(PAHs)的质量比.结果表明:16种PAHs的总质量比为350.0~3 877.4ng/g,平均质量比为1 322.6ng/g,4~6环相对丰度为58.5%,2~3环相对丰度为41.5%;PAHs在上游水区的质量比最高,与长江河口相近;除河源区外,大部分水域沉积物中PAHs人为来源为化石燃料的燃烧,少部分为石油源;除表层沉积物中芴和苊烯可能具有一定的暴露风险外,其他PAHs存在的暴露风险较小,即第二松花江沉积物PAHs总量远低于风险评估低值(ERL),存在的暴露风险较小.更多还原

【Abstract】 The mass contents of 16polycyclic aromatic hydrocarbons(PAHs)in the surface sediments of the second Songhua River were investigated.The total PAHs mass rate varied from 350.0to3 877.4ng/g,with the mean value being 1 322.6ng/g.The 4—6rings PAHs made up 58.5%,whereas 2—3rings PAHs made up 41.5%.The study shows that the mass content of PAHs was the highest in the surface sediments of the upstream of the second Songhua River.The total mass content of PAHs was close to that of the Yangtze River estuary.In addition to that from the source regions,the PAHs in the sediments were mainly from anthropogenic emission.Anthropogenically produced PAHs in the sediments in most of waters was from the burning of fossil fuels and a small part was from the petroleum derived.Exposure risk assessment results show that in addition to the fluorene and acenaphthylene,there was not obvious risk of exposure of other polycyclic aromatic hydrocarbons.The total mass content of PAHs in the sediments of the second Songhua River was much lower than the effects range-low(ERL),and there was not obvious risk of exposure basically.更多还原