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. The 2-methyltetrols have been widely chosen as chemical tracers forisoprene-derived secondary organic aerosols. While they are often assumed tobe relatively unreactive, a laboratory study reported that pure erythritolparticles (an analog of 2-methyltetrols) can be heterogeneously oxidized bygas-phase OH radicals at a significant rate. This might question theefficacy of these compounds as tracers in aerosol source-apportionmentstudies. Additional uncertainty could arise as organic compounds andinorganic salts often coexist in atmospheric particles. To gain moreinsights into the chemical stability of 2-methyltetrols in atmosphericparticles, this study investigates the heterogeneous OH oxidation of pureerythritol particles and particles containing erythritol and ammoniumsulfate (AS) at different dry inorganic-to-organic mass ratios (IOR) in anaerosol flow tube reactor at a high relative humidity of 85 %. The samereaction products are formed upon heterogenous OH oxidation of erythritoland erythritol–AS particles, suggesting that the reaction pathways are notstrongly affected by the presence and amount of AS. On the other hand, theeffective OH uptake coefficient, γeff , is found to decrease byabout a factor of ∼20 from 0.45±0.025 to 0.02±0.001 when the relative abundance of AS increases and the IOR increases from0.0 to 5.0. One likely explanation is the presence of dissolved ions slowsdown the reaction rates by decreasing the surface concentration oferythritol and reducing the frequency of collision between erythritol andgas-phase OH radicals at the particle surface. Hence, the heterogeneous OHreactivity of erythritol and likely 2-methyltetrols in atmospheric particleswould be slower than previously thought when the salts are present. Given2-methyltetrols often coexist with a significant amount of AS in manyenvironments, where ambient IOR can vary from ∼1.89 to ∼250 , our kinetic data would suggest that 2-methyltetrols inatmospheric particles are likely chemically stable against heterogeneous OHoxidation under humid conditions.

atmospheric chemistry and physics

Effect of inorganic-to-organic mass ratio on the heterogeneous OH reaction rates of erythritol: implications for atmospheric chemical stability of 2-methyltetrols