湘江源头某河段水体重金属污染特征与健康风险评价

Pollution characteristics and health risk assessment of heavy metals of a certain river in headwater stream of Xiangjiang River

  • 摘要: 为探究湘江源头某河段水体重金属分布特征并探讨其对沿岸居民健康的影响,在丰水期、枯水期以及平水期对该河段13个地表水样品中的5种重金属(As、Cu、Pb、Zn、和Cd)进行监测,通过内梅罗综合污染指数法、健康风险评价模型评价了该河段水体中5种重金属的污染现状、分布特征和可能产生的健康风险。结果表明,该河段水体中重金属浓度表现为Zn>As>Pb>Cd>Cu,污染程度为平水期≈枯水期>丰水期,且上游≈中游>下游。内梅罗综合污染指数法评价结果表明,该河段水体86.1%的采样点全年处于重度污染状态。健康风险评价结果表明,该河段地表水体中重金属引起的环境健康风险主要来自于As、Cd,二者浓度表现为上游>中游>下游,枯水期>平水期>丰水期,且儿童所面临的健康风险约为成人的2.1倍。

     

    Abstract: To investigate the distribution characteristics of heavy metal elements in a river section in headwater stream of Xiangjiang River and assess their health risks to coastal residents, five heavy metal elements (As, Cu, Pb, Zn and Cd) in 13 surface water samples of the river were collected and monitored at three periods (wet, dry and normal). The Nemero comprehensive pollution index method and the health risk assessment model were employed to study the pollution levels, distribution characteristics and potential health risks of these heavy metals. The results showed that the average metal concentrations in the surface water samples in the river followed the order of Zn > As > Pb > Cd > Cu. The pollution levels of these heavy metals were arranged as follows: normal period ≈ dry period > wet period, and upstream ≈ midstream > downstream. The results of Nemero comprehensive pollution index method showed that 86.1% of the sampling sites in the river were heavily polluted by heavy metals throughout the year. The result of health risk assessment indicated that the environmental health risks in the surface water in the study area were mainly caused by As and Cd. The health risk level of these heavy metals in study area followed the order of upstream > midstream > downstream and dry period > normal period > wet period. And the children were nearly 2.1 times more susceptible to health effects than adults.

     

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