TITLE

Investigation of a Systematic Offset in the Measurement of Organic Carbon with a Semicontinuous Analyzer

AUTHOR(S)
Offenberg, John H.; Lewandowski, Michael; Edney, Edward O.; Kleindienst, Tadeusz E.; Jaoui, Mohammed
PUB. DATE
May 2007
SOURCE
Journal of the Air & Waste Management Association;May2007, Vol. 57 Issue 5, p596
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Organic carbon (OC) was measured semicontinuously in laboratory experiments of steady-state secondary organic aerosol formed by hydrocarbon + nitrogen oxide irradiations. Examination of the mass of carbon measured on the filter for various sample volumes reveals a systematic offset that is not observed when performing an instrumental blank. These findings suggest that simple subtraction of instrumental blanks determined as the standard analysis without sample collection (i.e., by cycling the pump and valves yet filtering zero liters of air followed by routine chemical analysis) from measured concentrations may be inadequate. This may be especially true for samples collected through the filtration of small air volumes wherein the influence of the systematic offset is greatest. All of the experiments show that filtering a larger volume of air minimizes the influence of contributions from the systematic offset. Application of these results to measurements of ambient concentrations of carbonaceous aerosol suggests a need for collection of sufficient carbon mass to minimize the relative influence of the offset signal.
ACCESSION #
24993540

Tags: ORGANIC compounds;  CARBON;  AEROSOLS;  HYDROCARBONS;  CHEMISTRY, Analytic;  NITRIC oxide

 

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