DOI: 10.1016/j.atmosenv.2017.06.008
Scopus记录号: 2-s2.0-85020653738
论文题名: Compositional and surface characterization of HULIS by UV-Vis, FTIR, NMR and XPS: Wintertime study in Northern India
作者: Kumar V ; , Goel A ; , Rajput P
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 164 起始页码: 468
结束页码: 475
语种: 英语
英文关键词: FTIR
; HULIS
; IGP
; NMR
; PM10
; UV-VIS
; XPS
Scopus关键词: Absorption spectroscopy
; Atmospheric radiation
; Atoms
; Hydrogen bonds
; Ketones
; Nuclear magnetic resonance
; Nuclear magnetic resonance spectroscopy
; X ray photoelectron spectroscopy
; Absorption co-efficient
; Cloud condensation nuclei
; Direct radiative forcing
; FTIR
; HULIS
; State-of-the-art techniques
; Surface characterization
; UV-VIS
; Fourier transform infrared spectroscopy
; alcohol derivative
; aldehyde
; carbon
; carboxylic acid
; humic acid
; hydrogen
; ketone
; nitrogen
; proton
; sulfur
; absorbance
; absorption coefficient
; aerosol
; aerosol composition
; aerosol property
; diurnal variation
; FTIR spectroscopy
; humic substance
; nuclear magnetic resonance
; particulate matter
; ultraviolet radiation
; visible spectrum
; winter
; X-ray spectroscopy
; absorption
; aerosol
; Article
; controlled study
; Fourier transform infrared photoacoustic spectroscopy
; India
; oxidation
; priority journal
; proton nuclear magnetic resonance
; radiative forcing
; surface property
; ultraviolet spectrophotometry
; ultraviolet spectroscopy
; winter
; Gangetic Plain
; India
; Kanpur
; Uttar Pradesh
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: This study (first attempt) characterizes HULIS (Humic Like Substances) in wintertime aerosols (n = 12 during day and nighttime each) from Indo-Gangetic Plain (IGP, at Kanpur) by using various state-of-the art techniques such as UV-VIS, FTIR, 1H NMR and XPS. Based on UV-Vis analysis the absorption coefficient at 365 nm (babs-365) of HULIS was found to average at 13.6 and 28.8 Mm−1 during day and nighttime, respectively. Relatively high babs-365 of HULIS during the nighttime is attributed to influence of fog-processing. However, the power fit of UV-Vis spectrum provided near similar AAE (absorption Angstrom exponent) value of HULIS centering at 4.9 ± 1.4 and 5.1 ± 1.3 during daytime and nighttime, respectively. FTIR spectra and its double derivative revealed the presence of various functional groups viz. alcohols, ketones aldehydes, carboxylic acids as well as unsaturated and saturated carbon bonds. 1H NMR spectroscopy was applied to quantify relative percentage of various types of hydrogen atoms contained in HULIS, whereas XPS technique provided information on surface composition and oxidation states of various elements present. A significantly high abundance of H‒C‒O group has been observed in HULIS (based on 1H NMR); 41.4± 2.7% and 30.9± 2.4% in day and nighttime, respectively. However, aromatic protons (Ar-H) were higher in nighttime samples (19.3± 1.8%) as compared to that in daytime samples (7.5 ± 1.9). XPS studies revealed presence of various species on the surface of HULIS samples. Carbon existed in 7 different chemical states while total nitrogen and sulfur exhibited 3 and 2 different oxidation states (respectively) on the surface of HULIS. This study reports structural information and absorption properties of HULIS which has implications to their role as cloud condensation nuclei and atmospheric direct radiative forcing. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82299
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Civil Engineering and APTL at Center for Environmental Science and Engineering (CESE), IIT Kanpur, Kanpur, India
Recommended Citation:
Kumar V,, Goel A,, Rajput P. Compositional and surface characterization of HULIS by UV-Vis, FTIR, NMR and XPS: Wintertime study in Northern India[J]. Atmospheric Environment,2017-01-01,164