Ozone reaction with n-aldehydes (n=4-10), benzaldehyde, ethanol, isopropanol, and n-propanol adsorbed on a dual-bed graphitized carbon-carbon molecular sieve adsorbent cartridge.
Ozone reacts with n-aldehydes (n=4-10), benzaldehyde, ethanol, isopropanol and n-propanol adsorbed on a dual-bed graphitized carbon-carbon molecular sieve adsorbent cartridge. Destruction of n-aldehydes increases with n number and with ozone concentration. In some sampling experiments both generation and destruction of n-aldehydes by ozone are observed. In field experiments the results of sample analysis for n-aldehydes and benzaldehyde are frequently not proportional to sample volume whereas results for toluene and isoprene, and sometimes for total carbon, are. A simple theory is developed to simulate the net result of three processes: the adsorption of compounds from an air stream onto a solid adsorbent, the generation of compounds by reaction of ozone with materials upstream of or on the adsorbent, and the destruction by ozone of pre-existing compounds and compounds adsorbed from the sample stream. The use of distributed volume pairs is recommended as a way to identify loss of sample integrity during air monitoring experiments.
McClenny
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National Exposure Research Laboratory, Environmental Protection Agency, Research Triangle Park, NC 27711, USA. mcclenny.william@epamail.epa.gov
Colón
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Oliver
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D000433:1-Propanol / Q000737:chemistry*; D019840:2-Propanol / Q000737:chemistry*; D000447:Aldehydes / Q000737:chemistry*; D001547:Benzaldehydes / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry; D002849:Chromatography, Gas / Q000379:methods; D000431:Ethanol / Q000737:chemistry*; D008962:Models, Theoretical; D010126:Ozone / Q000737:chemistry*
D000447:Aldehydes; D001547:Benzaldehydes; D000431:Ethanol; D010126:Ozone; D002244:Carbon; D000433:1-Propanol; D019840:2-Propanol; C032175:benzaldehyde