分子拡散型簡易測定法による環境大気中のアンモニア濃度の測定

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  • A Simple Measurement Method of Ammonia in the Atmosphere Using the Molecular Diffusion Sampler

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A simple measurement method of ammonia (NH3) concentration in the atmosphere during a long-term and over a wide-area was examined.<BR>The method was as follows: a molecular diffusion sampler which was a silica fiber cylindrical filter (PA-CF) treated with a mixed solution of 5% phosphoric acid and 5% glycerin and covered with a polyfuron filter was exposed in the atmosphere for a month. NH4+ in an aqueous extract of the PA-CF was analyzed with a ion chromatograph.<BR>It became evidence that this method was a rapid determination and an effective simple measurement of NH3 concentration in the atmosphere for a month long term.<BR>Influences of meteorological factors (temperature, relative humidity and wind velocity) on this method was not noticed for measurement of NH3 in the chamber experiment, in the case the PA-CF sampler was set in the shelter which was 20% ventilation rate.<BR>By comparing data sets gained with this method to those with imprigated cartridge method for NH3 concentration, the correlation coefficients (r) and the sample numbers (n) were r=0.96 (n=24), and hence the correlation was recognized at 1% significant level.<BR>The method established in this study was applied to the measurement of NH3 at 9 sites in Nara Prefecture in a period from Apr., 1988 to Mar., 1989. The annual mean concentration (ppb) of NH3 turned out to be as follows: 11-15 at commercial, 5.0, 5.4 at mountainous, 0.2, 1.6 at clean and 0.2 at mountainous clean. Hence, the main origin of generation of NH3 in the atmosphere was suggested to be causedby the artificial generation of human activity.

収録刊行物

  • 大気汚染学会誌

    大気汚染学会誌 25 (2), 163-169, 1990

    公益社団法人 大気環境学会

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