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异龙湖沉积物重金属人为污染与潜在生态风险
摘要点击 345  全文点击 129  投稿时间:2018-05-13  修订日期:2018-08-03
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中文关键词  异龙湖  沉积物  重金属  含量与形态  污染  潜在生态风险
英文关键词  Yilong Lake  sediment  heavy metals  concentration and chemical speciation  pollution  potential eco-risk
作者单位E-mail
李小林 山东师范大学地理与环境学院, 人地协调与绿色发展山东省高校协同创新中心, 济南 250358 2967016225@qq.com 
刘恩峰 山东师范大学地理与环境学院, 人地协调与绿色发展山东省高校协同创新中心, 济南 250358
中国科学院南京地理与湖泊研究所, 湖泊与环境国家重点实验室, 南京 210008 
liuenfeng@sdnu.edu.cn 
于真真 中国科学院南京地理与湖泊研究所, 湖泊与环境国家重点实验室, 南京 210008
中国科学院地理科学与资源研究所, 北京 100101
中国科学院大学, 北京 100049 
 
张恩楼 中国科学院南京地理与湖泊研究所, 湖泊与环境国家重点实验室, 南京 210008  
林琪 中国科学院南京地理与湖泊研究所, 湖泊与环境国家重点实验室, 南京 210008
中国科学院大学, 北京 100049 
 
王荣 中国科学院南京地理与湖泊研究所, 湖泊与环境国家重点实验室, 南京 210008  
沈吉 中国科学院南京地理与湖泊研究所, 湖泊与环境国家重点实验室, 南京 210008  
中文摘要
      本文通过对云南省异龙湖4个沉积短岩芯中Al、Ti、As、Cd、Cr、Cu、Ni、Pb、Hg、Zn等金属元素含量与赋存形态的分析,研究了重金属污染特征和潜在生态风险.结果表明,除Cd之外,沉积物中其余金属元素含量变化较小,变异系数均小于0.3.根据聚类分析结果,所有元素可分为两组,第Ⅰ组元素包括As、Cd、Hg和Pb,第Ⅱ组元素包括Al、Ti、Cr、Cu、Ni和Zn;各沉积岩芯中每组元素具有相似的垂向变化规律,但不同沉积岩芯中各组元素变化趋势存在较大差异,反映了较为复杂的沉积环境特征.相关分析表明,沉积物中金属元素含量的变化明显受到沉积物质地变化的影响.沉积物中Cd和Pb以可还原态为主,平均质量分数分别为48%和42%;Cr、Cu、Zn和Ni主要赋存于残渣态中,平均质量分数分别为68%~82%.根据重金属富集系数和次生相富集系数评价结果,Cd为主要的污染元素,平均达到了中等污染程度,而其他元素为污染至弱污染水平;人为贡献的重金属主要赋存于可提取态中.综合生态风险指数与沉积物质量基准评价结果、以及重金属污染水平与赋存形态,异龙湖表层沉积物中As、Cu、Hg、Ni、Pb和Zn具有低等程度的潜在生态风险,Cd具有较高程度的潜在生态风险.
英文摘要
      The concentrations of Al, Ti, As, Cd, Cr, Cu, Ni, Pb, Zn, and Hg and chemical speciation of Cd, Cr, Cu, Ni, Pb, and Zn in four short cores sampled from the Yilong Lake, Yunnan Province were analyzed. The vertical and spatial features in the pollution levels and potential ecological risks of heavy metals in the sediments were studied. Except for the wide concentration ranges of Cd, the metals in the sediments showed narrow variations in their concentrations with coefficients of variation less than 0.3. According to the cluster analysis results, all metals could be classified into two groups:metals in group Ⅰ included As, Cd, Hg, and Pb, while metals in group Ⅱ included Al, Ti, Cr, Cu, Ni, and Zn. The metals in each group exhibited similar vertical variations in each core, but their variations were highly different between the cores. The correlation analysis results demonstrated that the variations in metal concentrations in the sediments were greatly regulated by the sediment texture. Therefore, the enrichment factor (EF) method was used for the differentiation of metals from the natural and anthropogenic sources and for the pollution assessment based on the total metal concentrations. The Cd and Pb in the sediments were mainly presented in the reducible speciation with percentages of 48% and 42%, respectively; Cr, Cu, Zn, and Ni were primarily (68%-82%) associated with the residual speciation. Based on the EF and chemical speciation of metals and their enrichment coefficients of the secondary phase, Cd was the typical pollutant with moderate pollution on average, and the other elements were observed in non-to weak pollution levels. Anthropogenic metals were mainly associated with the extractable speciation in the sediment. Combining the ecological risk index, the sediment quality guidelines, as well as the pollution level and chemical speciation of metals, As, Cu, Hg, Ni, Pb, and Zn in the surface sediments of Yilong Lake should have low potential ecological risk. However, Cd may pose a high potential ecological risk.

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