Development of a Selective Light-Emitting Diode Photolytic NO2 Converter for Continuously Measuring NO2 in the Atmosphere

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• 作者：Yasuhiro Sadanaga ; Yuki Fukumori ; Tadashi Kobashi ; Makoto Nagata ; Norimichi Takenaka ; Hiroshi Bandow
• 刊名：Analytical Chemistry
• 出版年：2010
• 出版时间：November 15, 2010
• 年：2010
• 卷：82
• 期：22
• 页码：9234-9239
• 全文大小：218K
• 年卷期：v.82,no.22(November 15, 2010)
• ISSN：1520-6882

文摘

A photolytic converter of nitrogen dioxide (NO₂) to nitric oxide (NO) using light-emitting diodes (LEDs) has been designed to measure NO₂ in the troposphere. The typical electrical power consumption of the photolytic converter (PLC) is only 44 W. The maximum conversion efficiency of NO₂ to NO of the photolytic converter is around 90%, which is higher than that of metal halides or high-pressure Xe arc lamps (up to 70%). The conversion efficiency of the PLC was almost constant for at least 2.5 months. The conversion efficiency of peroxyacetyl nitrate by the LED-PLC was measured to be 2.6 ± 0.1% (1σ). The interference of HONO using the PLC was experimentally estimated to be less than 3%, which is within the uncertainty of the instrument. An intercomparison of NO₂ measurements between the PLC-CLD and the laser-induced fluorescence (LIF) technique was conducted, and the NO₂ concentrations measured by the PLC-CLD method were in agreement with those obtained by the LIF technique, within the uncertainties of the instruments. Continuous observations were made on Fukue Island, a remote area. These results demonstrate the performance of the PLC for continuous ambient measurements.