Development of measurement for low level SO_2 gas content with chemiluminescence

本课题的主要目的是研制高灵敏度大气SO_2气体低混合比检测仪器。1987年，在实验室对化学发光过程和化学发光强度进行了研究。1988年，研究了空气采样法、氧化剂与大气SO_2生成的SO_3溶液的混合过程。从1987年的实验来看，化学发光的光强度预计足够强，可以用光电倍增管探测到。第二年，我们选择了CHOONH_4溶液；2 muM和NaOH；0.1 mM捕集大气二氧化硫和Se(SO_4) _2溶液；5 mM, h2so_4；从化学发光过程的详细实验中得到100mm作为氧化剂。为了使这两种溶液充分混合，我们使用细管，用泵输送这两种溶液。细管排列成一束，呈涡旋状，置于光电倍增管表面。现场试验表明，该仪器可在10分钟内测得二氧化硫浓度。

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.