Interactive comment on “ Effects of Inorganic Salts on the Heterogeneous OH Oxidation of Organic Compounds : Insights from Methylglutaric Acid-Ammonium Sulfate ” by Hoi Ki Lam

This study reports differences in the heterogeneous OH oxidation kinetics and particlephase products of representative pure-component organic aerosol and mixed organicinorganic aerosol under conditions of particle deliquescence. The authors report the reactive uptake coefficients between OH + methylglutaric acid and OH + methylglutaric acid/ammonium sulfate aerosol measured using an oxidation flow cell coupled with a direct analysis in real time (DART) mass spectrometer and conclude that while oxidation products are similar between the two aerosol systems, the uptake kinetics are significantly slower in the case of the methylglutaric acid/ammonium sulfate aerosol