Measurement of NO2 with the PhoNO photolytic converter system

Global Analyzer Systems Ltd.（GASL）的科学家已经构建了一种新型光解NO2转换器的原型，可用于升级现有的NO/NOx化学发光环境空气监测器。这些仪器被环境监测机构和排放烟囱监测器用来量化NO和NO2。目前的版本使用非特异性热金属催化剂将NO2转化为NO，通过化学发光检测。GASL的目标是开发一种专门针对NO2的转换器。Osthoff博士的研究小组将量化原型转化器中已知成分的各种气体的转化效率，包括NO2（所需）和潜在的干扰气体，如HONO、ClNO 2、PAN、N2 O 5、HO 2NO 2和HNO 3。干扰，可能会产生的光化学分解ofcarbonyls和随后的氧化NO NO2的特点。实验结果将使用光化学箱模型模拟进行归一化。替代的石英光解池（例如，具有较小的内部尺寸）将被构造和评估。最终目标是让GASL向市场提供一个特征鲜明、成熟和上级的产品。

Scientists at Global Analyzer Systems Ltd. (GASL) have constructed a prototype of a novel photolytic NO2converter that can be used to upgrade existing NO/NOx chemiluminescence ambient air monitors. Theseinstruments are used by environmental monitoring agencies and emission stack monitors to quantify NO andNO2. Current versions use a non-specific hot metal catalyst to convert NO2 to NO, which is detected bychemiluminescence. GASL's goal is to develop a converter that is specific to NO2. They are seeking to developa scientific understanding of what gases and gas mixtures cause interferences in the prototype converter to helpbring it to market.Dr. Osthoff's group will quantify the conversion efficiency in the prototype of a variety of gases in gas streamsof known composition, including NO2 (desired) and potentially interfering gases such as HONO, ClNO2,PAN, N2O5, HO2NO2, and HNO3. Interference that might arise from photochemical decomposition ofcarbonyls and subsequent oxidation of NO to NO2 will be characterized. The experimental results will berationalized using photochemical box model simulations.Alternative quartz photolysis cells (e.g., with smaller inner dimensions) will be constructed and evaluated. Theultimate goal is to allow GASL to deliver a well-characterized, mature, and superior product to market.