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DOI10.5194/amt-7-2829-2014
The influence of temperature calibration on the OC-EC results from a dual-optics thermal carbon analyzer
Pavlovic, J.1; Kinsey, J. S.2; Hays, M. D.2
发表日期2014
ISSN1867-1381
卷号7期号:9页码:2829-2838
英文摘要

Thermal-optical analysis (TOA) is a widely used technique that fractionates carbonaceous aerosol particles into organic and elemental carbon (OC and EC), or carbonate. Thermal sub-fractions of evolved OC and EC are also used for source identification and apportionment; thus, oven temperature accuracy during TOA analysis is essential. Evidence now indicates that the "actual" sample (filter) temperature and the temperature measured by the built-in oven thermocouple (or set-point temperature) can differ by as much as 50 degrees C. This difference can affect the OC-EC split point selection and consequently the OC and EC fraction and sub-fraction concentrations being reported, depending on the sample composition and in-use TOA method and instrument. The present study systematically investigates the influence of an oven temperature calibration procedure for TOA. A dual-optical carbon analyzer that simultaneously measures transmission and reflectance (TOT and TOR) is used, functioning under the conditions of both the National Institute of Occupational Safety and Health Method 5040 (NIOSH) and Interagency Monitoring of Protected Visual Environment (IMPROVE) protocols. The application of the oven calibration procedure to our dual-optics instrument significantly changed NIOSH 5040 carbon fractions (OC and EC) and the IMPROVE OC fraction. In addition, the well-known OC-EC split difference between NIOSH and IMPROVE methods is even further perturbed following the instrument calibration. Further study is needed to determine if the widespread application of this oven temperature calibration procedure will indeed improve accuracy and our ability to compare among carbonaceous aerosol studies that use TOA.


语种英语
WOS记录号WOS:000343119600003
来源期刊ATMOSPHERIC MEASUREMENT TECHNIQUES
来源机构美国环保署
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/58410
作者单位1.Oak Ridge Inst Sci & Educ, Oak Ridge, TN 37831 USA;
2.US EPA, Off Res & Dev, Natl Risk Management Res Lab, Res Triangle Pk, NC 27711 USA
推荐引用方式
GB/T 7714
Pavlovic, J.,Kinsey, J. S.,Hays, M. D.. The influence of temperature calibration on the OC-EC results from a dual-optics thermal carbon analyzer[J]. 美国环保署,2014,7(9):2829-2838.
APA Pavlovic, J.,Kinsey, J. S.,&Hays, M. D..(2014).The influence of temperature calibration on the OC-EC results from a dual-optics thermal carbon analyzer.ATMOSPHERIC MEASUREMENT TECHNIQUES,7(9),2829-2838.
MLA Pavlovic, J.,et al."The influence of temperature calibration on the OC-EC results from a dual-optics thermal carbon analyzer".ATMOSPHERIC MEASUREMENT TECHNIQUES 7.9(2014):2829-2838.
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