2008 年 43 巻 2 号 p. 112-118
We propose herein a new principle to measure atmospheric NO using an NO2 detector. We tested this method to determine whether precise measurements are achievable or not when using a laser induced fluorescence detector for NO2. To convert NO to NO2, O3 is added to the sample air. When adding O3, not all of the NO is used in the generation of NO2: some of the NO does not react with the O3 and some of the formed NO2 reacts with O3.Using a box model we simulated the time evolution of the NO2 concentration after the addition of the O3. We found the optimum condition of reaction time and O3 concentration by both calculation and experiment. To verify the usefulness of ambient air measurements using this technique, observations were conducted. NO concentrations obtained by this system were compared with those of the chemiluminescence technique and resulted in excellent agreement.