@article{oai:nagoya.repo.nii.ac.jp:00011628, author = {後藤, 晃彦 and Goto, Akihiko and 森泉, 純 and Moriizumi, Jun and 飯田, 孝夫 and Iida, Takao}, journal = {名古屋大学加速器質量分析計業績報告書}, month = {Mar}, note = {Atmospheric ^<14>CO can be used as a tracer of the global tropospheric hydroxyl radical (OH・) concentration. Hydroxyl radical is significantly responsible for the destruction of many sort of trace gas ; methane, carbon monoxide and so on. For collecting atmospheric carbon monoxide, a preparation line was remodeled from a methane preparation line. This line enriches carbon monoxide in about 1m^3 air by adsorption under low temperature. The enriched carbon monoxide is purified of other gas components with gas chromatography. The purified carbon monoxide is finally turned to carbon dioxide through the combustion tube in the preparation line. However, 1m^3 air include only about 0.1-1ml of carbon monoxide, it is not enough to ^<14>CO measurement by AMS (AMS need 1mg carbon or 2ml carbon dioxide). Thus, the carbon dioxide derived from the carbon monoxide in the air sample is diluted with the other carbon dioxide whose isotopic ratio is known. In this experiment, more than 3ml carbon monoxide separated from urban air was devided to three, and two of those were diluted with carbon dioxide whose isotopic ratio was known. Then, their ^<14>CO isotopic ratios were measured. The ratios of ^<14>C/^<13>C of atmospheric caron monoxide calculated with those of the diluted samples and their dilution rate were accordant to directly measured ^<14>C/^<13>C ratio of the not-diluted sample. However, errors of the calculated ratios became larger due to dilution. Hereafter, this preparation will be appraised and reconditioned to effectuate measurement of ^<14>C/^<13>C ratio in atmospheric carbon monoxide with the dilution method., タンデトロン加速器質量分析計業績報告 Summaries of Researches Using AMS 1999 (平成11)年度}, pages = {164--169}, title = {大気中<14>^CO測定手法の検討(II)}, volume = {11}, year = {2000} }