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The photochemical conversion of NO2 to HONO on humic acids (HA) in the presence of benzophenone (BP) was investigated using a flow tube reactor coupled to a NOx analyzer at ambient pressure. BP significantly enhanced the reduction of NO2 to HONO on HA under simulated sunlight, as shown by the increase of NO2 uptake coefficient (γ) and HONO yield with the mass ratio of BP to HA. The γ and HONO yield...
Oxidizing components in the atmosphere may play competitive roles in the heterogeneous photochemical reaction of NO2 with humic acids (HA). Effects of O2 and O3 on the conversion of NO2 to HONO on HA under simulated sunlight were investigated using a flow tube reactor. The uptake coefficient (γ) of NO2 and the HONO formation rate decreased with the increase of the O2 content (0%–20%) and the O3 concentration...
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