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 N
2O was observed in N
2O-N
2-O
2 mixture for two hours in Tedlar bag and glass vessel. NO in NO-N
2-O
2 mixture was oxidized to NO
2 in Tedlar bag, and the rate of oxidation was represented as 7.5×10
5⋅l
2⋅mol
-2⋅min
-1⋅ [NO] [O
2] . The rate was not affected by the presense of water vapour, while NO
2 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 NO
2 decreased by the absor-ption on glass wall. By the presence of water vapour, the rate of oxidation of NO to NO
2 increased a little, and the absorption of NO
2 on glass wall remarkably. No chemical change of NO
2 in NO
2-N
2-O
2 mixture took place, while NO
2 absorption was accelerated by water vapour and glass wall similar to the case of NO-N
2-O
2 mixture. NO
2 absorbed on the glass wall was reduced to NO and desorbed quantitatively by the irradiation with high pressure mercury lamp.
View full abstract