Lead Binding to Soil Fulvic and Humic Acids: NICA-Donnan Modeling and XAFS Spectroscopy
Xiong, J; Koopal, LK; Tan, WF; Fang, LC; Wang, MX; Zhao, W; Liu, F; Zhang, J; Weng, LP;张静
刊名ENVIRONMENTAL SCIENCE & TECHNOLOGY
2013
卷号47期号:20页码:11634-11642
学科分类Engineering; Environmental Sciences & Ecology
DOI10.1021/es402123v
英文摘要Binding of lead (Pb) to soil fulvic acid (JGFA), soil humic acids (JGHA, JLHA), and lignite-based humic acid (PAHA) was investigated through binding isotherms and XAFS. Pb binding to humic substances (HS) increased with increasing pH and decreasing ionic strength. The NICA-Donnan model described Pb binding to the HS satisfactorily. The comparison of the model parameters showed substantial differences in median Pb affinity constants among JGFA, PAHA, and the soil HAs. Milne's "generic" parameters did not provide an adequate prediction for the soil samples. The Pb binding prediction with generic parameters for the soil HAs was improved significantly by using the value n(Pb1) = 0.92 instead of the generic value n(Pb1) = 0.60. The n(Pb1)/n(H1) ratios obtained were relatively high, indicating monodentate Pb binding to the carboxylic-type groups. The n(Pb2)/n(H2) ratios depended somewhat on the method of optimization, but the values were distinctly lower than the n(Pb1)/n(H1) rim ratios, especially when the optimization was based on Pb bound vs log [Pb2+]. These low values indicate bidentate binding to the phenolic-type groups at high Pb concentration. The NICA-Donnan model does not consider bidentate binding of Pb to a carboxylic- and a phenolic-type group. The EXAFS results at high Pb loading testified that Pb was bound in bidentate complexes of one carboxylic and one phenolic group (salicylate-type) or two phenolic groups (catechol-type) in ortho position.
收录类别SCI
WOS记录号WOS:000326123600035
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被引频次:23[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/224334
专题中国科学院高能物理研究所_多学科研究中心_期刊论文
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Xiong, J,Koopal, LK,Tan, WF,et al. Lead Binding to Soil Fulvic and Humic Acids: NICA-Donnan Modeling and XAFS Spectroscopy[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2013,47(20):11634-11642.
APA Xiong, J.,Koopal, LK.,Tan, WF.,Fang, LC.,Wang, MX.,...&Weng, LP;张静.(2013).Lead Binding to Soil Fulvic and Humic Acids: NICA-Donnan Modeling and XAFS Spectroscopy.ENVIRONMENTAL SCIENCE & TECHNOLOGY,47(20),11634-11642.
MLA Xiong, J,et al."Lead Binding to Soil Fulvic and Humic Acids: NICA-Donnan Modeling and XAFS Spectroscopy".ENVIRONMENTAL SCIENCE & TECHNOLOGY 47.20(2013):11634-11642.
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