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Copper binding to soil fulvic and humic acids: NICA-Donnan modeling and conditional affinity spectra
Xu, Jinling1; Tan, Wenfeng1,2; Xiong, Juan2; Wang, Mingxia2; Fang, Linchuan1; Koopal, Luuk K.2,3
2016-07-01
Source PublicationJOURNAL OF COLLOID AND INTERFACE SCIENCE
ISSN0021-9797
Volume473Pages:141-151
Corresponding AuthorFang, Linchuan(flinc629@hotmail.com)
AbstractBinding of Cu(II) to soil fulvic acid (JGFA), soil humic acids (JGHA, JLHA), and lignite-based humic acid (PAHA) was investigated through NICA-Donnan modeling and conditional affinity spectrum (CAS). It is to extend the knowledge of copper binding by soil humic substances (HS) both in respect of enlarging the database of metal ion binding to HS and obtaining a good insight into Cu binding to the functional groups of FA and HA by using the NICA-Donnan model to unravel the intrinsic and conditional affinity spectra. Results showed that Cu binding to HS increased with increasing pH and decreasing ionic strength. The amount of Cu bound to the HAs was larger than the amount bound to JGFA. Milne's generic parameters did not provide satisfactory predictions for the present soil HS samples, while material specific NICA-Donnan model parameters described and predicted Cu binding to the HS well. Both the 'low' and 'high' concentration fitting procedures indicated a substantial bidentate structure of the Cu complexes with HS. By means of CAS underlying NICA isotherm, which was scarcely used, the nature of the binding at different solution conditions for a given sample and the differences in binding mode were illustrated. It was indicated that carboxylic group played an indispensable role in Cu binding to HS in that the carboxylic CAS had stronger conditional affinity than the phenolic distribution due to its large degree of proton dissociation. The fact was especially true for JGFA and JLHA which contain much larger amount of carboxylic groups, and the occupation of phenolic sites by Cu was negligible. Comparable amounts of carboxylic and phenolic groups on PAHA and JGHA, increased the occupation of phenolic type sites by Cu. The binding strength of PAHA-Cu and JGHA-Cu was stronger than that of JGFA-Cu and JLHA-Cu. The presence of phenolic groups increased the chance of forming more stable complexes, such as the salicylate-Cu or catechol-Cu type structures. (C) 2016 Published by Elsevier Inc.
KeywordHumic substance Humic acid Fulvic acid Cu binding NICA-Donnan model Speciation Conditional affinity spectrum (CAS)
DOI10.1016/j.jcis.2016.03.066
WOS KeywordDISSOLVED ORGANIC-MATTER ; METAL-ION BINDING ; MULTICOMPONENT HETEROGENEOUS ADSORPTION ; OMBROTROPHIC PEAT BOG ; PROTON BINDING ; MOLECULAR-SIZE ; CHEMICAL-COMPOSITION ; CU(II) COMPLEXATION ; CATION-BINDING ; SUBSTANCES
Indexed BySCI
Language英语
Funding ProjectNatural Science Foundation of China[41330852] ; Natural Science Foundation of China[41425006] ; Natural Science Foundation of China[41201226] ; National Key Basic Research Program of China[2015CB150504]
Funding OrganizationNatural Science Foundation of China ; National Key Basic Research Program of China
WOS Research AreaChemistry
WOS SubjectChemistry, Physical
WOS IDWOS:000375168200018
PublisherACADEMIC PRESS INC ELSEVIER SCIENCE
Citation statistics
Cited Times:22[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/67128
Collection中国科学院地理科学与资源研究所
Corresponding AuthorFang, Linchuan
Affiliation1.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi Provinc, Peoples R China
2.Huazhong Agr Univ, Coll Resources & Environm, Wuhan 430070, Peoples R China
3.Wageningen Univ, Phys Chem & Soft Matter, Dreijenpl 6, NL-6703 HB Wageningen, Netherlands
Recommended Citation
GB/T 7714
Xu, Jinling,Tan, Wenfeng,Xiong, Juan,et al. Copper binding to soil fulvic and humic acids: NICA-Donnan modeling and conditional affinity spectra[J]. JOURNAL OF COLLOID AND INTERFACE SCIENCE,2016,473:141-151.
APA Xu, Jinling,Tan, Wenfeng,Xiong, Juan,Wang, Mingxia,Fang, Linchuan,&Koopal, Luuk K..(2016).Copper binding to soil fulvic and humic acids: NICA-Donnan modeling and conditional affinity spectra.JOURNAL OF COLLOID AND INTERFACE SCIENCE,473,141-151.
MLA Xu, Jinling,et al."Copper binding to soil fulvic and humic acids: NICA-Donnan modeling and conditional affinity spectra".JOURNAL OF COLLOID AND INTERFACE SCIENCE 473(2016):141-151.
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