Journal
AICHE JOURNAL
Volume 64, Issue 8, Pages 3151-3158Publisher
WILEY
DOI: 10.1002/aic.16204
Keywords
environmental chamber experiments; particulate chloride; reactive chlorine; photochemistry; heterogeneous chemistry
Categories
Funding
- State of Texas via the Texas Air Research Center [312UTA0133A, 413UTA0147A]
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Reactions initiated by chlorine atoms can enhance the formation of ozone (O-3) and secondary organic aerosol (SOA) in the troposphere. Environmental chamber experiments were conducted to quantify heterogeneous Cl-2 production from NH4Cl and NaCl particles exposed to O-3 and hydroxyl radicals (center dot OH). Observations are inconsistent with models of Cl-2 production resulting solely from surface-mediated reactions of center dot OH and suggest that O-3 plays a significant role. The production of Cl-2 increased with relative humidity and decreased in the presence of SOA or nitric oxides (NOx). Heterogeneous reactive uptake coefficients for the production of Cl-2 from O-3 on pure NH 4Cl (gamma(O3)) averaged 1.4 +/- 1.0 X 10(-3). Cl-2 production was six times more efficient on NH4Cl aerosol than on NaCl aerosol. Model calculations under atmospheric conditions suggest this heterogeneous Cl-2 production could increase peak daily O-3 concentrations by over 10%. (C) 2018 American Institute of Chemical Engineers
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