Methods have been developed to sample and quantitate vapor- phase nitrogen heterocyclic bases In ambient air. A hlgh-volume sampling procedure which employs Florlsll as an adsorbent Is used to trap azaarenes. The analytical procedure provides simple and reproducible determinations of trace levels of the two- and three-ringed nitrogen-containing compounds. The procedure Involves carefully controlled evaporative concentration oil eluates from Florlsll and a “mini” acid-base extraction. The data obtained from the analysis of ambient air Indicate that vapor-phase levels of azaarenes are many times higher than those previously reported based only on particulate matter. Thus, reports which did not measure vapor-phase concentrations have significantly under- measured the total concentrations of atmospheric nitrogen heterocycles.
ASJC Scopus subject areas
- Analytical Chemistry