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| - A Model Evaluation of the NOTitration Technique to RemoveAtmospheric Oxidants for theDetermination of AtmosphericOrganic Compounds
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| - Chemical artifact is a problem in the sampling ofatmospheric organic species for a relatively long samplingperiod. In this study, we evaluated a technique for theremoval of atmospheric oxidants with added NO during gasand aerosol sampling by theoretical approach using aRegional Atmospheric Chemistry Mechanism (RACM) model.The elimination of O3 in the sample air is regulatedpredominantly by the reaction of NO and O3 in all simulatedcases. We found that, without any oxidant scavenger,OH and NO3 concentrations in the sampler can be kepthigh even when wall loss processes of radicals are takeninto account. The relatively high concentration of OH ismainly due to the production of HOx in the sample air viathe decomposition of HO2NO2 and O3-olefin reactions,whereas NO3 is produced by the decomposition of N2O5.Addition of NO with appropriate concentrations was foundto effectively reduce both OH and NO3 concentrations inthe sampling devices. This study demonstrates that scavengingof OH and NO3 as well as O3 is important for the studyof chemical speciation of organic compounds and that NOaddition is a useful technique to eliminate these oxidants.
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