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Pubmed for Handhelds

PUBMED FOR HANDHELDS

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  • Title: Loading effect correction for real-time aethalometer measurements of fresh diesel soot.
    Author: Jimenez J, Claiborn C, Larson T, Gould T, Kirchstetter TW, Gundel L.
    Journal: J Air Waste Manag Assoc; 2007 Jul; 57(7):868-73. PubMed ID: 17688002.
    Abstract:
    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.
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