Abstract
The effects of oxygen, water vapour and walls of reactor vessels on the behaviors of various nitrogen oxides in air were studied at room temperature. No change of N2O was observed in N2O-N2-O2 mixture for two hours in Tedlar bag and glass vessel. NO in NO-N2-O2 mixture was oxidized to NO2 in Tedlar bag, and the rate of oxidation was represented as 7.5×105⋅l2⋅mol-2⋅min-1⋅ [NO] [O2] . The rate was not affected by the presense of water vapour, while NO2 decreased a little by the absorption on the reactor wall. In a glass vessel the oxidation rate is equal to that in Tedlar bag, while formed NO2 decreased by the absor-ption on glass wall. By the presence of water vapour, the rate of oxidation of NO to NO2 increased a little, and the absorption of NO2 on glass wall remarkably. No chemical change of NO2 in NO2-N2-O2 mixture took place, while NO2 absorption was accelerated by water vapour and glass wall similar to the case of NO-N2-O2 mixture. NO2 absorbed on the glass wall was reduced to NO and desorbed quantitatively by the irradiation with high pressure mercury lamp.
