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A new denuder-filter sampling technique has been used to investigate thegas/particle partitioning behaviour of the carbonyl products from thephotooxidation of isoprene and 1,3,5-trimethylbenzene. A series ofexperiments was performed in two atmospheric simulation chambers atatmospheric pressure and ambient temperature in the presence of NO<sub>x</sub> andat a relative humidity of approximately 50%. The denuder and filter wereboth coated with the derivatizing agent<i>O</i>-(2,3,4,5,6-pentafluorobenzyl)-hydroxylamine (PFBHA) to enable the efficientcollection of gas- and particle-phase carbonyls respectively. The tubes andfilters were extracted and carbonyls identified as their oxime derivativesby GC-MS. The carbonyl products identified in the experiments accounted foraround 5% and 10% of the mass of secondary organic aerosol formed fromthe photooxidation of isoprene and 1,3,5-trimethylbenzene respectively.  Experimental gas/particle partitioning coefficients were determined for awide range of carbonyl products formed from the photooxidation of isopreneand 1,3,5-trimethylbenzene and compared with the theoretical values based onstandard absorptive partitioning theory. Photooxidation products with asingle carbonyl moiety were not observed in the particle phase, butdicarbonyls, and in particular, glyoxal and methylglyoxal, exhibitedgas/particle partitioning coefficients several orders of magnitude higherthan expected theoretically. These findings support the importance ofheterogeneous and particle-phase chemical reactions for SOA formation andgrowth during the atmospheric degradation of anthropogenic and biogenichydrocarbons

Gas/particle partitioning of carbonyls in the photooxidation of isoprene and 1,3,5-trimethylbenzene