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洞庭湖典型水域表层沉积物中重金属空间分布特征及其潜在生态风险评价

张光贵 谢意南 莫永涛

张光贵, 谢意南, 莫永涛. 洞庭湖典型水域表层沉积物中重金属空间分布特征及其潜在生态风险评价[J]. 环境科学研究, 2015, 28(10): 1545-1552.
引用本文: 张光贵, 谢意南, 莫永涛. 洞庭湖典型水域表层沉积物中重金属空间分布特征及其潜在生态风险评价[J]. 环境科学研究, 2015, 28(10): 1545-1552.
ZHANG Guanggui, XIE Yinan, MO Yongtao. Spatial Distribution Characteristics and Potential Ecological Risk Assessment of Heavy Metals in Typical Water Surface Sediments of Dongting Lake[J]. Research of Environmental Sciences, 2015, 28(10): 1545-1552.
Citation: ZHANG Guanggui, XIE Yinan, MO Yongtao. Spatial Distribution Characteristics and Potential Ecological Risk Assessment of Heavy Metals in Typical Water Surface Sediments of Dongting Lake[J]. Research of Environmental Sciences, 2015, 28(10): 1545-1552.

洞庭湖典型水域表层沉积物中重金属空间分布特征及其潜在生态风险评价

基金项目: 全国重点湖泊水库生态安全保障方案项目(WFLY-2009-01-PG05)

Spatial Distribution Characteristics and Potential Ecological Risk Assessment of Heavy Metals in Typical Water Surface Sediments of Dongting Lake

  • 摘要: 基于2007—2012年连续对洞庭湖湘江入湖口至出湖口水域5个采样点——S1(樟树港)、S2(虞公庙)、S3(鹿角)、S4(君山)和S5(洞庭湖出口)表层沉积物中Cd、Hg、As、Cu、Pb、Cr和Zn 7种重金属质量分数分析,对该典型水域表层沉积物中重金属的空间分布特征进行了探讨,并采用潜在生态危害指数法对其生态风险进行评价. 结果表明:表层沉积物中w(Cd)、w(Hg)、w(As)、w(Cu)、w(Pb)、w(Cr)和w(Zn)分别为0.54~79.90、0.046~0.712、15.2~289.0、29.0~217.0、6.0~246.0、65.4~269.0和41.4~632.0 mg/kg,w(Cd)、w(Hg)、w(As)、w(Cu)、w(Pb)和w(Zn)沿程总体呈下降趋势,w(Cr)沿程变化较小;Cd具有很高生态风险,Hg具有中等生态风险,其余污染物具有低生态风险,不同污染物生态风险的大小顺序为Cd>Hg>As>Pb>Cu>Cr>Zn,各采样点的RI(潜在生态危害指数)为115.51~1 000.09,平均值为373.30,研究区域重金属总体具有高生态风险,其中S1采样点具有很高生态风险,不同采样点表层沉积物中重金属生态风险的大小顺序为S1>S2>S5>S4>S3;除Cr外,Cd、Hg、As、Cu、Pb和Zn主要来源于湘江,Cd和Hg是主要风险污染物,其中Cd为首要污染物,因此湘江重金属污染治理应以Cd为重点.

     

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