---
id: '88'
doi: 'https://dx.doi.org/10.1021/acs.est.1c04177'
publication_year: '2021'
first_author_name: 'Kelvin H Bates, James D Cope, Tran B Nguyen'
title: 'Gas-Phase Oxidation Rates and Products of 1,2-Dihydroxy Isoprene'
journal_short_name: 'Environ. Sci. Technol.'
publisher: 'American Chemical Society'
abstract: '1,2-Dihydroxy isoprene (1,2-DHI), a product of isoprene oxidation from multiple chemical pathways, is produced in the atmosphere in large quantities; however, its chemical fate has not been comprehensively studied. Here, we perform chamber experiments to investigate its gas-phase reactions. We find that the reactions of 1,2-DHI with OH radicals and ozone are rapid (kOH = 8.0 (±1.3) × 10?11 cm3 molecule?1 s?1; kO3 = 7.2 (±1.1) × 10?18 cm3 molecule?1 s?1). Reaction with OH, which dominates 1,2-DHI loss, leads primarily to fragmentation and radical recycling; major products under both high- and low-NO conditions include hydroxyacetone, glycolaldehyde, and 2,3-dihydroxy-2-methyl-propanal (DHMP). Radical-terminating hydroperoxide formation from the peroxy radical (RO2) reaction with HO2 and organonitrate formation from RO2 + NO are not observed in the gas phase, possibly due to low volatility; constraints for their branching ratios are instead derived by mass balance. We also measure secondary organic aerosol mass yields from 1,2-DHI (0?23%) and show that oxidation in the presence of aqueous particles leads to formic and acetic acid production. Finally, we incorporate results into GEOS-Chem, a global chemical transport model, to compute the global production (25.3 Tg a?1) and gas-phase loss (20.2 Tg a?1) of 1,2-DHI and show that its oxidation provides non-negligible contributions to the atmospheric budgets of hydroxyacetone, glycolaldehyde, hydroxymethyl hydroperoxide, formic acid, and DHMP.'
additional_notes: ''
user_id: '751'
publication_created_at: '2022-08-25 12:31:55'
publication_updated_at: '2022-08-25 12:31:55'

---
