In situ study of binding of copper by fulvic acid: Comparison of   differential absorbance data and model predictions

doi:10.1016/j.watres.2012.10.020

CORC > 北京大学 > 环境科学与工程学院

	In situ study of binding of copper by fulvic acid: Comparison of differential absorbance data and model predictions
	Yan, Mingquan ; Dryer, Deborah ; Korshin, Gregory V. ; Benedetti, Marc F.
刊名	水研究
	2013
关键词	Absorbance Complexation Copper Fulvic acid In situ methods Model DISSOLVED ORGANIC-MATTER EXCITATION-EMISSION MATRIX PARALLEL FACTOR-ANALYSIS HUMIC SUBSTANCES OPTICAL-PROPERTIES FLUORESCENCE-SPECTRA CHEMICAL SPECIATION STABILITY-CONSTANTS METAL COMPLEXATION MOLECULAR-WEIGHT
DOI	10.1016/j.watres.2012.10.020
英文摘要	This study examined the binding of copper(II) by Suwannee River fulvic acid (SRFA) using the method of differential absorbance that was used at environmentally-relevant concentrations of copper and SRFA. The pH- and metal-differential spectra were processed via numeric deconvolution to establish commonalities seen in the changes of absorbance caused by deprotonation of SRFA and its interactions with copper(II) ions. Six Gaussian bands were determined to be present in both the pH- and Cu-differential spectra. Their maxima were located, in the order of increasing wavelengths at 208 nm, 242 nm, 276 nm, 314 nm, 378 nm and 551 nm. The bands with these maxima were denoted as A0, A1, A2, A3, A4 and A5, respectively. Properties of these bands were compared with those existing in the spectra of model compounds such as sulfosalicylic acid (SSA), tannic acid (TA), and polystyrenesulfonic acid-co-maleic acid (PSMA). While none of the features observed in differential spectra of the model compound were identical to those present in the case of SRFA, Gaussian bands A1, A3 and possibly A2 were concluded to be largely attributable to a combination of responses of salicylic- and polyhydroxyphenolic groups. In contrast, bands A4 and A5 were detected in the differential spectra of SRFA only. Their nature remains to be elucidated. To examine correlations between the amount of copper(II) bound by SRFA and changes of its absorbance, differential absorbances measured at indicative wavelengths 250 nm and 400 nm were compared with the total amount of SRFA-bound copper estimated based on Visual MINTEQ calculations. This examination showed that the differential absorbances of SRFA in a wide range of pH values and copper concentrations were strongly correlated with the concentration of SRFA-bound copper. The approach presented in this study can be used to generate in situ information concerning the nature of functional groups in humic substances engaged in interactions with metals ions. This information can be useful for further elaboration and development of detailed theoretic models that describe the complexation of metals in the environment. (C) 2012 Elsevier Ltd. All rights reserved.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000315072600012&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Engineering, Environmental; Environmental Sciences; Water Resources; SCI(E); EI; PubMed; 19; ARTICLE; 2; 588-596; 47
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/158825]
专题	环境科学与工程学院
推荐引用方式 GB/T 7714	Yan, Mingquan,Dryer, Deborah,Korshin, Gregory V.,et al. In situ study of binding of copper by fulvic acid: Comparison of differential absorbance data and model predictions[J]. 水研究,2013.
APA	Yan, Mingquan,Dryer, Deborah,Korshin, Gregory V.,&Benedetti, Marc F..(2013).In situ study of binding of copper by fulvic acid: Comparison of differential absorbance data and model predictions.水研究.
MLA	Yan, Mingquan,et al."In situ study of binding of copper by fulvic acid: Comparison of differential absorbance data and model predictions".水研究 (2013).