Relative rate kinetics aqueous sulfate radical reaction with some atmospherically relevant compounds

The sulfate anion radical (SO4)  is a reactive oxidant formed in the autoxidation chain of sulfur dioxide. Recently, other formation pathways to SO4 for have been reported. This work investigated the second-order rate coefficients for the aqueous oxidation of some important organic aerosol compounds by the aqueous SO4 oxidation (kSO4). 2-methyltetrol, 2-methyl-1,2,3-trihydroxy-4-sulfate, 2-methyl-1,2-dihydroxy-3-sulfate, 1,2-dihydroxyisoprene, 2-methyl-2,3-dihydroxy-1,4-dinitrate, 2-methyl-1,2,4-trihydroxy-3-nitrate, 2-methylglyceric acid and 2-methylglycerate,  lactic acid and lactate, and pyruvic acid and pyruvate. The rate coefficients of unknowns are determined against that of erythritol in pure water in a temperature range of 298 – 322 K. The decays of each reagent were measured with nuclear magnetic resonance (NMR) and high-performance liquid chromatography-high resolution mass spectrometry (HPLC-HRMS). Incorporations of additional SO4 reactions into models may aid in the understanding of organosulfate formation, radical propagation, and aerosol mass sinks.

Methods
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