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Quantification of carbonate carbon in aerosol filter samples using a modified thermal/optical carbon analyzer (M-TOCA)
Ho, SSH (Ho, Steven Sai Hang)[1,2]; Ho, KF (Ho, Kin Fai)[1,3]; Liu, SX (Liu, Suixin)[1]; Liu, WD (Liu, Wandong)[4]; Lee, SC (Lee, Shun Cheng)[4]; Fung, KK (Fung, Kochy K.)[5]; Cao, JJ (Cao, Junji)[1]; Zhang, RJ (Zhang, Renjian)[6]; Huang, Y (Huang, Yu)[4]; Feng, NSY (Feng, Natele Siu Yau)[7]; Cheng, Y (Cheng, Yan)[8]
2012-12-31
发表期刊ANALYTICAL METHODS
卷号4期号:8页码:2578-2584
文章类型期刊论文
摘要

Measurement of carbon dioxide (CO2) gas evolved from acidification is a method to quantify carbonate carbon (CC) in aerosols collected on quartz fiber-filters. This paper describes the installation of an add-on device in a DRI Model 2001 Thermal Optical reflectance (TOR)/Thermal Optical Transmittance (TOT) Carbon Analyzer (M-TOCA) to facilitate a direct CC measurement. In each run, a maximum of 20 filter punches (each of 0.5 cm(2)) were acidified with 1 mL of 20% v/v phosphoric (V) acid in a vial under a 100% helium gas environment. The CO2 evolved was reduced to methane (CH4) and detected by a flame ionization detector (FID). The optimum reaction kinetics were obtained under an operational temperature of 40 degrees C and ultrasonic agitation. Method precisions were +/- 3.5% on average for carbonate standards ranging from 3.0 to 60.0 mu g and +/- 3.8% on average for ambient samples in masses ranging from 0.30 to 56.0 mu g respectively. Method accuracy was on average 91.9%, ranging from 81.4 to 102.1%. Minimum detection limit (MDL) of the M-TOCA method was 0.048 mu g cm(-2), corresponding to an ambient concentration of 0.098 mu g m(-3) for a sampled volume of air of 7.2 m(3). The MDL is >22 times lower than the value obtained using the novel method with a regular TOCA. Comparison studies on standards and ambient samples have demonstrated that the two methods do not yield systematic differences in concentrations of the carbonate. The lower MDL value provided by the M-TOCA allows a simple, precise and accurate measurement for ambient samples having a low CC concentration.

关键词Size-differentiated Aerosols Chemical Composition Scanning Electron Microscopy
DOI10.1039/c2ay05942h
收录类别SCIE ; EI
语种英语
引用统计
被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/10093
专题粉尘与环境研究室
通讯作者Ho, SSH (Ho, Steven Sai Hang)[1,2]
作者单位1.SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences,Xi’an, 710075, China;
2.Division of Atmospheric Sciences, Desert Research Institute, Reno, NV89512, USA;
3.School of Public Health and Primary Care, The Chinese University ofHong Kong, Hong Kong, China;
4.Department of Civil and Structural Engineering, Research Center forEnvironmental Technology and Management, The Hong KongPolytechnic University, Hung Hom, Hong Kong, China;
5.Atmoslytic, Inc., 23917 Craftsman Road, Calabasas, CA 91302, USA;
6.Key Laboratory of Regional Climate-Environment Research forTemperate East Asia, Institute of Atmospheric Physics, ChineseAcademy of Sciences, START Regional Center for Temperate East Asia,Beijing 100029, China;
7.Hong Kong Premium Services and Research Laboratory, Hung Hom,Hong Kong, China;
8.Department of Environmental Science and Technology, School of HumanSettlements and Civil Engineering, Xi’an Jiaotong University, No. 28Xianning West Road, Xi’an, Shaanxi, 710049, China
推荐引用方式
GB/T 7714
Ho, SSH ,Ho, KF ,Liu, SX ,et al. Quantification of carbonate carbon in aerosol filter samples using a modified thermal/optical carbon analyzer (M-TOCA)[J]. ANALYTICAL METHODS,2012,4(8):2578-2584.
APA Ho, SSH .,Ho, KF .,Liu, SX .,Liu, WD .,Lee, SC .,...&Cheng, Y .(2012).Quantification of carbonate carbon in aerosol filter samples using a modified thermal/optical carbon analyzer (M-TOCA).ANALYTICAL METHODS,4(8),2578-2584.
MLA Ho, SSH ,et al."Quantification of carbonate carbon in aerosol filter samples using a modified thermal/optical carbon analyzer (M-TOCA)".ANALYTICAL METHODS 4.8(2012):2578-2584.
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