Development of measurement for low level SO_2 gas content with chemiluminescence

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The main porpose of this research project was dcvelopment of high-sensitive insturument to detect low mixing ratio of atmospheric SO_2 gas. in 1987, chemiluminescence processcs and intensity of chcmiluminescence light were researched in a laboratory. In 1988, air-sampling method, mixing procedure of oxiding agent to solution containing SO_3 which originated from atmospheric SO_2 were studied.From the experiment in 1987, the light intensity of chemiluminescence was expected to be enough strong to detect with a photomultiplyer. In following year, we chose solution of CHOONH_4 ; 2 muM , and NaOH; 0.1 mM to catch atmospheric sulfur dioxide, and solution of Se(SO_4 ) _2 ; 5 mM, and H _2 SO_4 ; 100 mM as oxidation agent from detailed experiment on chemiluminescence processes. To take good mixture of those two solution, we used fine tube in which these two were transported with a pump. the fine tube, which was packed into a bundle with scroll shape, was located on the surface of photomultiplyer. in field test, the instrument showed that it was possible to measure ppt level SO_2 with the time resulution of 10 minutes.