Spectroscopic study of interactions of lead (II) ions with dissolved   organic matter: Evidence of preferential engagement of carboxylic groups

doi:10.1016/j.gca.2017.06.014

CORC > 北京大学 > 环境科学与工程学院

	Spectroscopic study of interactions of lead (II) ions with dissolved organic matter: Evidence of preferential engagement of carboxylic groups
	Lu, Yujuan ; Yan, Mingquan ; Korshin, Gregory V.
刊名	GEOCHIMICA ET COSMOCHIMICA ACTA
	2017
关键词	Carboxylic moiety Chromophores Complexation Differential absorbance spectroscopy Dissolved organic matter Lead RAY-ABSORPTION SPECTROSCOPY DONNAN MODEL PARAMETERS IN-SITU EXAMINATION HUMIC SUBSTANCES METAL-IONS FULVIC-ACIDS ABSORBENCY SPECTROSCOPY STABILITY-CONSTANTS BINDING COMPLEXATION
DOI	10.1016/j.gca.2017.06.014
英文摘要	The speciation, bioavailability and transport of Pb(II) in the environment are strongly affected by dissolved organic matter (DOM). Despite the importance of these interactions, the nature of Pb(II)-DOM binding is insufficiently attested. This study addressed this deficiency using the method of differential absorbance spectroscopy in combination with the non-ideal competitive adsorption (NICA)-Donnan model. Differential absorbance data allowed quantifying the interactions between Pb(II) and DOM in a wide range of pH values, ionic strengths and Pb(II) concentrations at an environmentally relevant DOM concentration (5 mg L-1). Changes of the slopes of the log-transformed absorbance spectra of DOM in the range of wavelength 242-262 and 350-400 nm were found to be predictive of the extent of Pb(II) bound by DOM carboxylic groups and of the total amount of DOM-bound Pb(II), respectively. The results also demonstrated the preferential involvement of DOM carboxylic groups in Pb(II) binding. The spectroscopic data allowed optimizing selected Pb(II)-DOM complexation constants used in the NICA-Donnan Model. This resulted in a markedly improved performance of that model when it was applied to interpret previously published Pb(II)-fulvic acid datasets. (C) 2017 Elsevier Ltd. All rights reserved.; China NSF [51578007]; Shenzhen science and technology project [JCYJ20160308103848156]; Shenzhen University Visiting Scholar Foundation Program; SCI(E); ARTICLE; 308-316; 213
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/470861]
专题	环境科学与工程学院
推荐引用方式 GB/T 7714	Lu, Yujuan,Yan, Mingquan,Korshin, Gregory V.. Spectroscopic study of interactions of lead (II) ions with dissolved organic matter: Evidence of preferential engagement of carboxylic groups[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2017.
APA	Lu, Yujuan,Yan, Mingquan,&Korshin, Gregory V..(2017).Spectroscopic study of interactions of lead (II) ions with dissolved organic matter: Evidence of preferential engagement of carboxylic groups.GEOCHIMICA ET COSMOCHIMICA ACTA.
MLA	Lu, Yujuan,et al."Spectroscopic study of interactions of lead (II) ions with dissolved organic matter: Evidence of preferential engagement of carboxylic groups".GEOCHIMICA ET COSMOCHIMICA ACTA (2017).