Abstract
Selective solvent extraction was used to characterize source and ambient particlulate matter collected during conditions of low photochemical activity, and the results were compared with those for samples collected during smog episodes. If the technique can correctly distinguish ozone-related, photochemically produced secondary compounds from primary (source) compounds, it should yield very different results for the two sampling conditions. The results of our comparison, however, indicate that selective solvent extraction is unable to uniquely identify the contribution of photochemical processes to the production of ambient particlulate matter.
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