小型拡散スクラバーによる硫黄化合物等大気成分の測定に関する研究

概要

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New systems have been developed for continuous and semi-continuous determinations of atmospheric trace gases. Analyte gases are collected into absorbing solutions at miniature diffusion scrubbers to concentrate, and the analytes are in-situ or subsequently measured. The systems are suitable for onsite measurement in the fields. Simultaneous and large dynamic range determinations of hydrogen sulfide, methanethiol and sulfur dioxide were performed with annular diffusion scrubbers. This system was applied for field measurement on the head-space of septic tank and the crater of Mt. Aso. A porous tube filled with an absorbing solution worked as a good waveguide and collector. By using this porous tube collector/Long path absorbance detector, we achieved sub-ppbv detection limits within a few minutes for nitrogen dioxide and ozone. A flat scrubber had only 800 nl cell integrated with microfabricated platinum electrodes for in-situ conductivity detection. This can determine sulfur dioxide at a higher time resolution than commercial instrument. A microchannel scrubber has been developed for high collection and low achieved solution consumption. Not only the diffusion scrubber, but also whole system included detector, sampling and liquid flow system were downsized and integrated. This system was proposed as the micro gas analysis system, μ-GAS.
社団法人日本分析化学会の論文
2006-01-05