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山美水库沉积物重金属污染状况及风险评价

张文慧 许秋瑾 胡小贞 耿荣妹 邱祖凯 姚程

张文慧, 许秋瑾, 胡小贞, 耿荣妹, 邱祖凯, 姚程. 山美水库沉积物重金属污染状况及风险评价[J]. 环境科学研究, 2016, 29(7): 1006-1013.
引用本文: 张文慧, 许秋瑾, 胡小贞, 耿荣妹, 邱祖凯, 姚程. 山美水库沉积物重金属污染状况及风险评价[J]. 环境科学研究, 2016, 29(7): 1006-1013.
ZHANG Wenhui, XU Qiujin, HU Xiaozhen, GENG Rongmei, QIU Zukai, YAO Cheng. Pollution and Potential Ecological Risks of Heavy Metals in Sediment of Shanmei Reservoir[J]. Research of Environmental Sciences, 2016, 29(7): 1006-1013.
Citation: ZHANG Wenhui, XU Qiujin, HU Xiaozhen, GENG Rongmei, QIU Zukai, YAO Cheng. Pollution and Potential Ecological Risks of Heavy Metals in Sediment of Shanmei Reservoir[J]. Research of Environmental Sciences, 2016, 29(7): 1006-1013.

山美水库沉积物重金属污染状况及风险评价

基金项目: 国家水体污染控制与治理科技重大专项(2014ZX07510-001)

Pollution and Potential Ecological Risks of Heavy Metals in Sediment of Shanmei Reservoir

  • 摘要: 为了解泉州市山美水库沉积物重金属空间分布及污染水平,采用电离子耦合法(ICP-MS)测定了库区20个采样点不同分层的67个沉积物样品的w(As)、w(Zn)、w(Cd)、w(Pb)、w(Cu)、w(Cr),并采用地累积指数法和潜在生态危害指数法进行了库区重金属污染程度及生态风险的评价. 结果表明,Cd是山美水库最主要的重金属污染物,不同分区分层w(Cd)平均值为0.24~0.49 mg/kg,受人为活动影响较大.不同分区w(Cd)存在差异,污染层的Ⅰ区、Ⅱ区显著高于Ⅲ区(P<0.05). Pb和Cu虽有累积但污染情况较轻. 重金属污染来源主要为入库河流承接的沿程生活、工业及农业污染物,部分来源为周边村庄的生活及农业污染物. 地累积指数法评价结果显示,山美水库各重金属元素的平均污染程度由强到弱依次为Cd(轻度污染)>Cu(清洁)>Pb(清洁)>As(清洁)>Zn(清洁)>Cr(清洁). 潜在生态风险结果显示,6种元素中,Cd的生态风险为“强”,其他重金属则是低或无生态风险. 研究显示,在开展底泥疏浚工作中,疏浚深度的确定应综合考虑沉积物氮、磷及重金属污染状况,并需在底泥堆场采取防渗措施避免重金属对土壤及地下水产生二次污染.

     

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出版历程
  • 收稿日期:  2015-12-02
  • 修回日期:  2016-03-25
  • 刊出日期:  2016-07-25

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