DOI: 10.1016/j.atmosenv.2017.12.011
Scopus记录号: 2-s2.0-85037999809
论文题名: Light attenuation versus evolved carbon (AVEC) – A new way to look at elemental and organic carbon analysis
作者: Nicolosi E ; M ; G ; , Quincey P ; , Font A ; , Fuller G ; W
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 175 起始页码: 145
结束页码: 153
语种: 英语
英文关键词: Air quality
; OCEC analysis
; Optical attenuation
; Particulate matter
; Thermal desorption
Scopus关键词: Air quality
; Electromagnetic wave attenuation
; Optical properties
; Quality control
; Thermal desorption
; Urban growth
; Analytical instrument
; Carbon concentrations
; Elemental and organic carbons
; Lower temperatures
; OCEC analysis
; Optical attenuation
; Particulate Matter
; Shadowing effects
; Organic carbon
; element
; elemental carbon
; organic carbon
; unclassified drug
; absorption
; accumulation
; air quality
; analytical method
; carbon
; data set
; desorption
; elemental carbon
; instrumentation
; light attenuation
; optical method
; organic carbon
; particulate matter
; sensor
; site investigation
; temperature
; thermal alteration
; urban area
; analysis
; Article
; attenuation
; attenuation versus evolved carbon plot
; oxygenation
; particulate matter
; priority journal
; sample
; temperature
; thermography
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: The Attenuation Versus Evolved Carbon (AVEC) plot is a new way to represent thermal-optical organic carbon/elemental carbon (OC/EC) analysis data. The accumulated carbon concentration is plotted against the attenuation (ln (I0/I)). Unlike the thermogram, it provides information about the sample properties rather than the instantaneous instrument sensor status. The plot can be used to refine the determination of OC and EC split point, either from consideration of laser instability or transit time within the instrument; to investigate the optical properties of the particles; and to spot the early evolution of pyrolysed carbon (PC) and/or EC during the inert phase. 168 samples from three sites were studied. The gradient of the AVEC plot curve in the oxygenated phase provides information about the mass absorption cross section (σ) of the particles leaving the filter. The σ of the PC generated in the higher temperature Quartz protocol was greater than the PC generated in the lower temperature EUSAAR_2 protocol. Also, in both cases the PC evolved at a lower temperature in the oxygenated phase than the native EC. To minimise the shadowing effect, σ was also measured for the particles leaving the filter at the end of the analysis. These σ values, which are expected to be a combination of inherent σ together with fixed instrumental factors, were consistent between the different sites (45 ± 10 m2 g−1 in rural samples, 42 ± 8 m2 g−1 in urban samples and 35 ± 14 m2 g−1 in roadside samples). The AVEC plot can be generated from the data routinely produced by the analytical instrument using the R-code supplied in the supplementary material. © 2017 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83060
Appears in Collections: 气候变化事实与影响
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作者单位: MRC-HPA Centre for Environment and Health, School of Biomedical & Health Sciences, King's College London, 150 Stamford Street, London, United Kingdom; Chemical, Medical and Environmental Sciences Department, National Physical Laboratory, Hampton Road, Teddington, Middlesex, United Kingdom
Recommended Citation:
Nicolosi E,M,G,et al. Light attenuation versus evolved carbon (AVEC) – A new way to look at elemental and organic carbon analysis[J]. Atmospheric Environment,2018-01-01,175