Measurement of black carbon (BC) by an optical method and a thermal-optical method: Intercomparison for four sites

Date

2009-12-01

Author

Tanveer, Ahmed
Vincent Ahmed, Dutkiewicz
Akhtar, Shareef
Tuncel, Süleyman Gürdal
TUNCEL, SEMRA
Liaquat, Husain

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Comparison of black carbon (BC) measurements obtained by two methods was performed for aerosols samples collected on Whatman 41 (W-41) filters, using an optical method (Magee Scientific Optical Transmissometer Model OT-21) and a thermal-optical method (Sunset Laboratory Thermal-optical analyzer). Samples were collected from four sites: Albany (a small urban site, NY), Antalya (coastal site, Turkey), Whiteface Mountain (remote site, NY) and Mayville (rural site, NY). At Albany, comparison between the two methods showed excellent agreement; a least-squares regression line yielded a slope of 1.02, and r(2) = 0.88. Similar comparisons at Antalya (slope of 1.02, r(2) = 0.5) and Whiteface Mountain (slope of 0.92 and r(2) = 0.58) also gave very good relationship. At Mayville, the relationship between the two methods yielded somewhat lower regression: a slope of 0.75, and r(2) = 0.44. The data from the four locations, when plotted together, yielded an excellent agreement: a slope of 0.91, and r(2) of 0.84. Based on our measurements, it appears that optical measurement using the OT-21 can be successfully applied to determination of BC in W-41 filters. However, because of the variability in the chemical composition of BC aerosol at different locations, it is suggested that the calibration of OT-21 when using W-41 filters should be performed with a statistically significant numbers of samples for specific sites.

Subject Keywords

Light absorption, Transmissometer, Whatman 41, Black carbon

URI

https://hdl.handle.net/11511/32108

Journal

ATMOSPHERIC ENVIRONMENT

DOI

https://doi.org/10.1016/j.atmosenv.2009.09.031

Collections

Graduate School of Natural and Applied Sciences, Article

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Citation Formats

A. Tanveer, D. Vincent Ahmed, S. Akhtar, S. G. Tuncel, S. TUNCEL, and H. Liaquat, “Measurement of black carbon (BC) by an optical method and a thermal-optical method: Intercomparison for four sites,” ATMOSPHERIC ENVIRONMENT, pp. 6305–6311, 2009, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/32108.