Analysis of semi-volatile materials (SVM) in fine particulate matter

Christian Mark Salvador; Charles C.K. Chou

doi:10.1016/j.atmosenv.2014.06.046

Analysis of semi-volatile materials (SVM) in fine particulate matter

Christian Mark Salvador, Charles C.K. Chou

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

The mass fraction of semi-volatile materials (SVM) in fine particulate matter (PM_2.5) was investigated at a subtropical urban aerosol observatory (TARO, 25.0 °N, 121.5 °E) in Taipei, Taiwan during August 2013. In particular, an integrated Denuder-FDMS-TEOM system was employed to study the effectiveness of the coupling of FDMS and TEOM instruments. The charcoal and MgO denuders used in this study performed a removal efficiency of 89 and 95% for positive interferences in OC and nitrate measurements, respectively, and did not induce a significant particle loss during the field campaign, suggesting that denuders should be considered as a standard device in PM_2.5 instrumentation. Analysis on the mass concentration and speciation data found that, as a result of SVM loss, FRM-based measurement underestimated PM_2.5 by 21% in our case. Coupling FDMS to TEOM significantly improved the bias in PM_2.5 mass concentration from -25% to -14%. The negative bias in FDMS-TEOM was attributed to the failure of FDMS in recovering the mass of lost SVOMs in PM_2.5. The results of this study highlight the significance of SVM in a subtropical urban environment, give a warning of underestimated health risk relevant to PM_2.5 exposure, and necessitate further development of instrument and/or technique to provide accurate ambient levels of fine particulate matters.

Original language	English
Pages (from-to)	288-295
Number of pages	8
Journal	Atmospheric Environment
Volume	95
DOIs	https://doi.org/10.1016/j.atmosenv.2014.06.046
State	Published - Oct 2014
Externally published	Yes

Funding

The authors gratefully acknowledge the logistic supports from the department of atmospheric sciences, National Taiwan University, and the financial support from the Academia Sinica and the National Science Council Taiwan through grants 99-2111-M-001-005-MY3 , 101-2119-M-001-003 , and 102-2628-M-001-007 . Also we thank the Taiwan EPA for providing the air quality and meteorological data.

Funders	Funder number
National Science Council	102-2628-M-001-007, 99-2111-M-001-005-MY3, 101-2119-M-001-003
Academia Sinica
National Taiwan University

Keywords

Atmospheric aerosols
Denuder
FDMS-TEOM
Urban air quality

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.atmosenv.2014.06.046

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abstract = "The mass fraction of semi-volatile materials (SVM) in fine particulate matter (PM2.5) was investigated at a subtropical urban aerosol observatory (TARO, 25.0 °N, 121.5 °E) in Taipei, Taiwan during August 2013. In particular, an integrated Denuder-FDMS-TEOM system was employed to study the effectiveness of the coupling of FDMS and TEOM instruments. The charcoal and MgO denuders used in this study performed a removal efficiency of 89 and 95% for positive interferences in OC and nitrate measurements, respectively, and did not induce a significant particle loss during the field campaign, suggesting that denuders should be considered as a standard device in PM2.5 instrumentation. Analysis on the mass concentration and speciation data found that, as a result of SVM loss, FRM-based measurement underestimated PM2.5 by 21% in our case. Coupling FDMS to TEOM significantly improved the bias in PM2.5 mass concentration from -25% to -14%. The negative bias in FDMS-TEOM was attributed to the failure of FDMS in recovering the mass of lost SVOMs in PM2.5. The results of this study highlight the significance of SVM in a subtropical urban environment, give a warning of underestimated health risk relevant to PM2.5 exposure, and necessitate further development of instrument and/or technique to provide accurate ambient levels of fine particulate matters.",

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AB - The mass fraction of semi-volatile materials (SVM) in fine particulate matter (PM2.5) was investigated at a subtropical urban aerosol observatory (TARO, 25.0 °N, 121.5 °E) in Taipei, Taiwan during August 2013. In particular, an integrated Denuder-FDMS-TEOM system was employed to study the effectiveness of the coupling of FDMS and TEOM instruments. The charcoal and MgO denuders used in this study performed a removal efficiency of 89 and 95% for positive interferences in OC and nitrate measurements, respectively, and did not induce a significant particle loss during the field campaign, suggesting that denuders should be considered as a standard device in PM2.5 instrumentation. Analysis on the mass concentration and speciation data found that, as a result of SVM loss, FRM-based measurement underestimated PM2.5 by 21% in our case. Coupling FDMS to TEOM significantly improved the bias in PM2.5 mass concentration from -25% to -14%. The negative bias in FDMS-TEOM was attributed to the failure of FDMS in recovering the mass of lost SVOMs in PM2.5. The results of this study highlight the significance of SVM in a subtropical urban environment, give a warning of underestimated health risk relevant to PM2.5 exposure, and necessitate further development of instrument and/or technique to provide accurate ambient levels of fine particulate matters.

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Analysis of semi-volatile materials (SVM) in fine particulate matter

Abstract

Funding

Keywords

UN SDGs

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