Distinguishing the contributions of residential wood combustion and mobile source emissions using relative concentrations of dimethylphenanthrene isomers

Article Abstract:

Residential wood combustion (RWC) and motor vehicle (MV) emissions were characterized as the two major sources in an analysis of air particulate matter samples that were collected in Boise, ID. The samples were subjected to gas chromatography with mass spectrometric detection. Levels of source contributions were measured by comparing polycyclic aromatic hydrocarbon concentrations from burning soft woods, RWC and MV. A consistent relationship was observed among the relative concentrations and their distribution between the two major sources.

Health aspects, Motor vehicles, Wood, Combustion gases

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Radiocarbon measurements of atmospheric volatile organic compounds: quantifying the biogenic contribution

Article Abstract:

A multi-step process for measuring the biogenic contributions in the radiocarbon abundance of atmospheric volatile organic compounds (VOC) is described. It includes methods for isolating the total VOC fraction in whole air samples, for oxidizing this fraction to CO2 and for reducing the resulting CO2 to an AMS Fe-C target for 14C measurements. VOC fractions were separated from two composited urban tropospheric air samples collected in the summer of 1992 in Atlanta, GA.

Research, Methods, Carbon, Carbon isotopes, Atmospheric research

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Removing CO2 from atmospheric samples for radiocarbon measurements of volatile organic compounds

Article Abstract:

Two methods that use LiOH to selectively remove CO2 from ambient whole air samples were found to be capable of decreasing CO2 in ambient air samples by 4 orders of magnitude, with only a minimal effect on their volatile organic compound (VOC) content. According to VOC speciation findings, aldehydes generally suffered the greatest loss during CO2 removal, while hydrocarbons were virtually unaffected.

Management, Ozone layer depletion, Atmospheric carbon dioxide

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