Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 51, Issue 13, Pages 7486-7495Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.7b01397
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- MIURPNRA
- CPER (Ministry, Region, and FEDER Europe)
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Irradiated nitrophenols can produce nitrite and nitrous acid (HONO) in bulk aqueous solutions and in viscous aqueous films, simulating the conditions of a high-solute strength aqueous aerosol, with comparable quantum yields in solution and viscous films (10(-5)-10(-4) in the case of 4-nitrophenol) and overall reaction yields up to 0.3 in solution. The process is particularly important for the para-nitrophenols, possibly because their less sterically hindered nitro groups can be released more easily as nitrite and HONO. The nitrophenols giving the highest photoproduction rates of nitrite and HONO (most notably, 4-nitrophenol and 2-methyl-4-nitrophenol) could significantly contribute to the occurrence of nitrite in aqueous phases in contact with the atmosphere. Interestingly, dew-water evaporation has shown potential to contribute to the gas-phase HONG levels during the morning, which accounts for the possible importance of the studied process.
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