松花江水中多环芳烃(PAHs)的环境风险评价

以松花江10个采样点江水中8种多环芳烃(PAHs)的监测质量浓度为基础数据,采用推广风险系数法和健康评价四步法对PAHs进行生态风险评价和人体健康风险评价.结果表明:枯水期和平水期,蒽对水生生物的风险最大;风险商表征说明:枯水期PAHs对水生生物存在风险;平水期8种PAHs对水体生态系统的风险影响较低,需要进一步跟踪分析.人体健康评价结果表明:PAHs对人体健康存在风险,但风险值在10-6～10-7,属于可接受范围.PAHs的承纳水平分析表明:松花江水体对于PAHs污染物具有一定承载能力.

Risk assessment of polycyclic aromatic hydrocarbons in water of the Songhua River

Based on the observed concentration of eight PAHs from water of the Songhua River,generalized risk factor and four-step health risk approach were employed to address the ecological and health risk of PAHs to local aquatic ecosystem.The results show that anthracene was the most toxic compound to aquatic organisms both in low-flow period and mean-flow period.The hazard quotient indicates that the ecological risk of 8 PAHs is high in low-flow period,but low in mean-flow period.The concentration of 8 PAHs probably brings risk to human health,but the risk is in an acceptable range of 10 -6-10 -7.The main stream water of the Songhua River is with a certain carrying capacity of PAHs pollution.