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DOI | 10.5194/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 |
ISSN | 1867-1381 |
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
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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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