DOI: 10.1016/j.watres.2018.07.062
Scopus记录号: 2-s2.0-85053024162
论文题名: Dissolved organic matter binding with Pb(II) as characterized by differential spectra and 2D UV–FTIR heterospectral correlation analysis
作者: Xu H. ; Yan M. ; Li W. ; Jiang H. ; Guo L.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 144 起始页码: 435
结束页码: 443
语种: 英语
英文关键词: Differential spectra
; Dissolved organic matter
; Heavy metals
; NICA-Donnan model
; Two dimensional heterospectral correlation analysis
Scopus关键词: Biogeochemistry
; Biological materials
; Correlation methods
; Dissolution
; Fluorescence
; Fourier transform infrared spectroscopy
; Functional groups
; Heavy metals
; Ionic strength
; Metal analysis
; Aquatic environments
; Binding sensitivity
; Differential absorbance
; Differential spectra
; Dissolved organic matters
; Fluorescence spectra
; Hetero-spectral correlation
; Interfacial process
; Lead compounds
; aquatic environment
; chemical binding
; complexation
; correlation
; dissolved organic matter
; environmental fate
; FTIR spectroscopy
; heavy metal
; heterogeneity
; lead
; numerical model
; polysaccharide
; probe
; spectrum
; ultraviolet radiation
英文摘要: Dissolved organic matter (DOM) in aquatic environment significantly influences the behavior and fate of heavy metals via binding, complexation and thus changes the metal speciation; however detailed interfacial processes and mechanisms are still unclear. Here, differential absorbance and fluorescence spectra and two dimensional UV–FTIR heterospectral correlation analysis were applied to probe into the Pb(II)–DOM interaction at a wide range of pH and ionic strength (IS). The absorbance of DOM molecules under all conditions increased with metal addition, while the different extents of absorbance variations along the wavelength range in the differential zero-order and log-transformed absorbance spectra indicated the site heterogeneity within the DOM pool for metal binding. Spectral parameters, namely differential fluorescent components 1 and 2 (DFC1 and DFC2) and differential slopes of log-transformed absorbance in the range of wavelength 350–400 nm (DSlope350–400) were found to be highly correlated with the total amounts of DOM-bound Pb(II) predicted by the NICA-Donnan model, while the differential absorbance spectra at 235 nm (DA235) was related to the extent of Pb(II) bound by carboxylic groups. Thus, these parameters are an indicator or proxy for the in situ Pb(II)–DOM interaction extent. Aryl C–H gave the fastest response to Pb(II) binding at lower pH and IS (e.g., pH 4.7 and IS = 0.01 M), followed by carboxyl C=O and polysaccharide C–OH and then chromophoric groups at 265 nm (CDOM265). However, the CDOM265 bound to Pb(II) prior to aryl C–H and polysaccharide C–OH groups at higher pH and IS (6.0 and 0.1 M, respectively), showing that the binding sequences were highly dependent on solution chemistry. Differential spectra combined with two dimensional UV–FTIR heterospectral correlation analysis can be used as a promising approach to elucidate metal–DOM interaction processes, including site heterogeneity, binding sensitivity and sequence at the functional group level. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112539
Appears in Collections: 气候减缓与适应
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作者单位: State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China; School of Freshwater Sciences, University of Wisconsin-Milwaukee, 600 E Greenfield Ave., Milwaukee, WI 53204, United States; Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing, 100871, China; State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China
Recommended Citation:
Xu H.,Yan M.,Li W.,et al. Dissolved organic matter binding with Pb(II) as characterized by differential spectra and 2D UV–FTIR heterospectral correlation analysis[J]. Water Research,2018-01-01,144