Analyzer for Measuring NO3/N2O5 in the Atmosphere by Laser-Induced Fluorescence Technique

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  • MATSUMOTO Jun
    Japan Science and Technology Agency
  • KOSUGI Naohiro
    Department of Applied Chemistry, Graduate Course of Engineering, Tokyo Metropolitan University
  • IMAI Hidekazu
    Department of Applied Chemistry, Graduate Course of Engineering, Tokyo Metropolitan University
  • KAJII Yoshizumi
    Department of Applied Chemistry, Graduate Course of Engineering, Tokyo Metropolitan University

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  • レーザー誘起蛍光法による大気中ＮＯ３／Ｎ２Ｏ５測定装置
  • ソウチ ト ギジュツ レーザー ユウキ ケイコウホウ ニ ヨル タイキ チュウ NO3 N2O5 ソクテイ ソウチ

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Abstract

NO3 and N2O5 are important as intermediates of NOx loss in the nocturnal atmosphere. In this study, laser-in-duced fluorescence (LIF) technique is applied for measuring NO3 and N2O5 in the atmosphere. A tunable dye laser pumped by a pulsed Nd: YVO4 laser was utilized as an excitation light source. NO3 was excited around its 623-nm absorption peak and the induced fluorescence was detected. For measuring N2O5, thermal decomposition of N2O5 was carried out and then generated NO3 was detected. As a result of improvement and calibration of the instrument, the limits of detection for NO3 and N2O5 reached 4 and 6 pptv, respectively (S/N=1, 10-min averaging). A measurement test of N2O5 was conducted in the urban atmosphere to check the applicability of the instru-ment. The LIF instrument is promising to measure atmospheric NO3 and N2O5. This is a successful case of ap-plying a spectroscopic method to the environmental chemistry.

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