Loading Effect Correction for Real-time Aethalometer Measurements of Fresh Diesel Soot
In this study, a correction was developed for the aethalometer to measure real-time black carbon (BC) concentrations in an environment dominated by fresh diesel soot. The relationship between the actual mass-specific absorption coefficient for BC and the BC-dependent attenuation coefficients was determined from experiments conducted in a diesel exposure chamber that provided constant concentrations of fine particulate matter (PM; PM(2.5); PM < 2.5 microm in aerodynamic diameter) from diesel exhaust. The aethalometer reported BC concentrations decreasing with time from 48.1 to 31.5 microg m(-3) when exposed to constant PM(2.5) concentrations of 55 +/- 1 microg m(-3) and b(scat) = 95 +/- 3 Mm(-1) from diesel exhaust. This apparent decrease in reported light-absorbing PM concentration was used to derive a correction K(ATN) for loading of strong light-absorbing particles onto or into the aethalometer filter tape, which was a function of attenuation of light at 880 nm by the embedded particles.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- U. Concepcion/Chile
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 925570
- Report Number(s):
- LBNL-62736; JAWAEB; TRN: US200810%%1
- Journal Information:
- Journal of the Air and Waste Management Association, Journal Name: Journal of the Air and Waste Management Association; ISSN 1047-3289
- Country of Publication:
- United States
- Language:
- English
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