Atmospheric OH Reactivity Measurement Using Comparative Reactivity Method Followed by Gas Chromatography or Proton Transfer Reaction Mass Spectrometry

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  • 反応性比較法に基づくガスクロマトグラフィーやプロトン移動反応質量分析による大気中OHラジカル反応性の測定
  • ハンノウセイ ヒカクホウ ニ モトズク ガスクロマトグラフィー ヤ プロトン イドウ ハンノウ シツリョウ ブンセキ ニ ヨル タイキ チュウ OH ラジカル ハンノウセイ ノ ソクテイ

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Abstract

There are many chemical species in the atmosphere, and it is difficult to measure all of them for air-quality monitoring. Therefore, the total OH reactivity had been proposed as an indicator of air quality. The total OH reactivity can be directly measured by employing a developed system using lasers. However, this system is complicated to operate, and expensive, because it requires 3 lasers. Here, a new lower-cost and user-friendly OH reactivity measurement system using a comparative reactivity method (kind of competitive reaction method) has been developed. In this OH reactivity measurement system, a comparative reactivity substance is added to the air sample, and then the OH radical is mixed. From a decrease of the comparative reactivity substance, the total OH reactivity of the sampled air can be deduced. The decrease in the comparative reactivity substance is monitored by proton transfer reaction mass spectrometry or GC-FID. These OH reactivity measurement systems using the comparative reactivity method have been tested for ambient air measurements and were compared with the OH reactivity measurement system using lasers.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 62 (5), 369-378, 2013

    The Japan Society for Analytical Chemistry

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