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Thermal/Optical Methods for Elemental Carbon Quantification in Soils and Urban Dusts: Equivalence of Different Analysis Protocols
Han, YM (Han, Yongming)[ 1,5 ]; Chen, A (Chen, Antony)[ 1,2 ]; Cao, JJ (Cao, Junji)[ 1 ]; Fung, K (Fung, Kochy)[ 3 ]; Ho, F (Ho, Fai)[ 1,4 ]; Yan, BZ (Yan, Beizhan)[ 5 ]; Zhan, CLL (Zhan, Changlin)[ 1 ]; Liu, SX (Liu, Suixin)[ 1 ]; Wei, C (Wei, Chong)[ 1 ]; An, ZS (An, Zhisheng)[ 1 ]
2013-12-17
Source PublicationPLOS ONE
Volume8Issue:12Pages:e83462
Subtype期刊论文
Abstract

Quantifying elemental carbon (EC) content in geological samples is challenging due to interferences of crustal, salt, and organic material. Thermal/optical analysis, combined with acid pretreatment, represents a feasible approach. However, the consistency of various thermal/optical analysis protocols for this type of samples has never been examined. In this study, urban street dust and soil samples from Baoji, China were pretreated with acids and analyzed with four thermal/optical protocols to investigate how analytical conditions and optical correction affect EC measurement. The EC values measured with reflectance correction (ECR) were found always higher and less sensitive to temperature program than the EC values measured with transmittance correction (ECT). A hightemperature method with extended heating times (STN120) showed the highest ECT/ECR ratio (0.86) while a lowtemperature protocol (IMPROVE-550), with heating time adjusted for sample loading, showed the lowest (0.53). STN ECT was higher than IMPROVE ECT, in contrast to results from aerosol samples. A higher peak inert-mode temperature and extended heating times can elevate ECT/ECR ratios for pretreated geological samples by promoting pyrolyzed organic carbon (PyOC) removal over EC under trace levels of oxygen. Considering that PyOC within filter increases ECR while decreases ECT from the actual EC levels, simultaneous ECR and ECT measurements would constrain the range of EC loading and provide information on method performance. Further testing with standard reference materials of common environmental matrices supports the findings. Char and soot fractions of EC can be further separated using the IMPROVE protocol. The char/soot ratio was lower in street dusts (2.2 on average) than in soils (5.2 on average), most likely reflecting motor vehicle emissions. The soot concentrations agreed with EC from CTO-375, a pure thermal method.

DOI10.1371/journal.pone.0083462
Indexed By其他
Language英语
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Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/9915
Collection粉尘与环境研究室
Corresponding AuthorHan, YM (Han, Yongming)[ 1,5 ]
Affiliation1.Key Laboratory of Aerosol Science & Technology, SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, China;
2.Desert ResearchInstitute, Reno, Nevada, United States of America;
3.AtmAA Inc., Calabasas, California, United States of America;
4.School of Public Health and Primary Care,The Chinese University of Hong Kong, Shatin, Hong Kong, China;
5.Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, UnitedStates of America
Recommended Citation
GB/T 7714
Han, YM ,Chen, A ,Cao, JJ ,et al. Thermal/Optical Methods for Elemental Carbon Quantification in Soils and Urban Dusts: Equivalence of Different Analysis Protocols[J]. PLOS ONE,2013,8(12):e83462.
APA Han, YM .,Chen, A .,Cao, JJ .,Fung, K .,Ho, F .,...&An, ZS .(2013).Thermal/Optical Methods for Elemental Carbon Quantification in Soils and Urban Dusts: Equivalence of Different Analysis Protocols.PLOS ONE,8(12),e83462.
MLA Han, YM ,et al."Thermal/Optical Methods for Elemental Carbon Quantification in Soils and Urban Dusts: Equivalence of Different Analysis Protocols".PLOS ONE 8.12(2013):e83462.
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