Effects of charging on the chromophores of dissolved organic matter from   the Rio Negro basin

doi:10.1016/j.watres.2014.03.044

CORC > 北京大学 > 环境科学与工程学院

	Effects of charging on the chromophores of dissolved organic matter from the Rio Negro basin
	Yan, Mingquan ; Korshin, Gregory V. ; Claret, Francis ; Croue, Jean-Philippe ; Fabbricino, Massimiliano ; Gallard, Herve ; Schaefer, Thorsten ; Benedetti, Marc F.
刊名	水研究
	2014
关键词	Amazon river Absorbance Deprotonation Dissolved organic matter NEXAFS NICA-Donnan model AQUATIC HUMIC SUBSTANCES NICA-DONNAN MODEL AMAZON-RIVER OPTICAL-PROPERTIES FULVIC-ACIDS FLUORESCENCE SPECTROSCOPY MASS-SPECTROMETRY PROTON-BINDING SURFACE WATERS MOLECULAR-SIZE
DOI	10.1016/j.watres.2014.03.044
英文摘要	This study demonstrates that the deprotonation of dissolved organic matter (DOM) originating from a small creek characteristic for DOM-rich waters located in the Rio Negro basin can be quantified based on measurements of pH effects on its absorbance spectra. The method was ascertained by the data of Near-Edge X-Ray Absorbance Spectroscopy (NEX-AFS), potentiometric titration to quantify the structural and compositional differences between the colloidal and hydrophobic fractions that contribute 91% of black-water creek DOM. Changes in the absorbance spectra of the DOM fractions caused by deprotonation quantified via numeric deconvolution which indicated the presence of six well-resolved Gaussian bands in the differential spectra. The emergence of these bands was determined to be associated with the engagement of carboxylic and phenolic functionalities and changes of inter-chromophore interactions in DOM molecules. Interpretation of the data based on the NICA-Donnan approach showed that behavior of DOM chromophores was consistent with results of potentiometric titrations. Similar trends were observed for changes of the spectral slope of the DOM absorbance spectra in the range of wavelengths 325-375 nm (DSlope(325-375)). The behavior of DSlope(325-375) values was modeled based on the NICA-Donnan approach and correlated with potentiometrically-estimated charges attributed to the carboxylic and phenolic groups. The correlations between DSlope(325-375) and charges of low- and high-affinity protonation-active groups in DOM were monotonic but not linear and had important differences between the colloidal and hydrophobic fractions. (C) 2014 Elsevier Ltd. All rights reserved.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000337861400015&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Engineering, Environmental; Environmental Sciences; Water Resources; SCI(E); EI; PubMed; 7; ARTICLE; yankingcn@yahoo.com; 154-164; 59
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/189708]
专题	环境科学与工程学院
推荐引用方式 GB/T 7714	Yan, Mingquan,Korshin, Gregory V.,Claret, Francis,et al. Effects of charging on the chromophores of dissolved organic matter from the Rio Negro basin[J]. 水研究,2014.
APA	Yan, Mingquan.,Korshin, Gregory V..,Claret, Francis.,Croue, Jean-Philippe.,Fabbricino, Massimiliano.,...&Benedetti, Marc F..(2014).Effects of charging on the chromophores of dissolved organic matter from the Rio Negro basin.水研究.
MLA	Yan, Mingquan,et al."Effects of charging on the chromophores of dissolved organic matter from the Rio Negro basin".水研究 (2014).