Lead Binding to Soil Fulvic and Humic Acids: NICA-Donnan Modeling and XAFS Spectroscopy
文献类型：期刊论文
| 作者 | 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
 |
| 出版日期 | 2013 |
| 卷号 | 47期号:20页码:11634-11642 |
| 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. |
| 学科主题 | Engineering; Environmental Sciences & Ecology |
| 收录类别 | SCI |
| WOS记录号 | WOS:000326123600035 |
| 公开日期 | 2016-05-03 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/224334]  |
| 专题 | 高能物理研究所_多学科研究中心 |
| 推荐引用方式 GB/T 7714 | 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. |
入库方式： OAI收割
来源：高能物理研究所
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