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滇池沉积物不同分子量溶解性有机质分布及其与Cu和Pb的相互作用

石陶然 张远 于涛 张彦

石陶然, 张远, 于涛, 张彦. 滇池沉积物不同分子量溶解性有机质分布及其与Cu和Pb的相互作用[J]. 环境科学研究, 2013, 26(2): 137-144.
引用本文: 石陶然, 张远, 于涛, 张彦. 滇池沉积物不同分子量溶解性有机质分布及其与Cu和Pb的相互作用[J]. 环境科学研究, 2013, 26(2): 137-144.
SHI Tao-ran, ZHANG Yuan, YU Tao, ZHANG Yan. Distribution of Different Molecular Weight Fractions of Dissolved Organic Matters and Their Complexation with Cu and Pb in the Sediment from Dianchi Lake, China[J]. Research of Environmental Sciences, 2013, 26(2): 137-144.
Citation: SHI Tao-ran, ZHANG Yuan, YU Tao, ZHANG Yan. Distribution of Different Molecular Weight Fractions of Dissolved Organic Matters and Their Complexation with Cu and Pb in the Sediment from Dianchi Lake, China[J]. Research of Environmental Sciences, 2013, 26(2): 137-144.

滇池沉积物不同分子量溶解性有机质分布及其与Cu和Pb的相互作用

基金项目: 国家重点基础研究发展计划(973)项目(2008CB418201);国家水体污染控制与治理科技重大专项(2012ZX07506)

Distribution of Different Molecular Weight Fractions of Dissolved Organic Matters and Their Complexation with Cu and Pb in the Sediment from Dianchi Lake, China

  • 摘要: 采用平衡渗析法、离子计和光谱分析等技术研究了滇池表层沉积物中DOM(溶解性有机质)的分子量分布特征及不同分子量的DOM对Cu和Pb的结合能力. 结果表明,草海和外海沉积物中DOM的分子量组成有显著差异. 草海沉积物中DOM主要以分子量为3.5~5.0ku的组分为主;外海沉积物中DOM以分子量为0.5~2.0ku的组分为主. 滇池各级分子量DOM的腐殖化程度(以A3/A4计,A3、A4分别为DOM在300、400nm处的紫外吸光度)在1.57~6.00之间,而且DOM腐殖化程度和芳香性随着分子量的增加而增大. 离子计分析和三维荧光光谱特征表明,Cu趋向于和分子量为2.0~3.5ku的DOM结合,而Pb趋向于和分子量≤0.5ku的DOM结合. 用结合容量和分配系数(Kd)表征Cu、Pb与DOM在两相中的结合能力,分子量为2.0~3.5ku的DOM中的w(Cu)最大,草海和外海分别为717.65和340.27mg/g;分子量≤0.5ku的DOM中的w(Pb)最大,草海和外海分别为2988.84和5073.45mg/g.

     

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出版历程
  • 收稿日期:  2012-11-21
  • 修回日期:  2012-12-23
  • 刊出日期:  2013-02-25

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