Abstract
ROXMAS (ROx Chemical Conversion/CIMS), a novel method for atmospheric speciated measurements of HO 2 and the sum of organic peroxy radicals (∑RO 2) developed by MPI-K, has been successfully deployed in a field campaign on Monte Cimone, Italy, June-July 2000. The method relies on amplifying chemical conversion of peroxy radicals to gaseous sulfuric acid via the chain reaction with NO and SO 2 and detection of the sulfuric acid by CIMS. Speciated measurements have been realized by diluting atmospheric air in either N 2 or O 2 buffer, thus exploiting the dependence of the conversion efficiency of RO 2 to HO 2 on [O 2], [NO], and [SO 2]. Speciated measurements of HO 2 and RO 2 are required to provide further insight into radical partitioning and thus to elucidate further the mechanisms of the oxidation of volatile organic compounds in the troposphere. This methodology yields useful speciated results for atmospheric conditions where CH 3O 2 makes a major contribution to total RO 2. Under other conditions it gives an upper limit for [HO 2] and a lower limit for [∑RO 2].
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