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Tracing Material Cycle Using Stable Isotopes : Carbon Monoxide from Automobile
| Title: | Tracing Material Cycle Using Stable Isotopes : Carbon Monoxide from Automobile |
| Authors: | Tsunogai, Urumu Browse this author | | Komatsu, Daisuke D. Browse this author | | Ijiri, Akira Browse this author | | Sasakawa, Motoki Browse this author | | Nakagawa, Fumiko Browse this author |
| Keywords: | Gasoline automobile | | Carbon monoxide | | Exhaust | | Isotope | | Functional catalytic converter |
| Issue Date: | 2004 |
| Publisher: | Graduate School of Science, Hokkaido University |
| Citation: | Edited by Shunsuke F. Mawatari, Hisatake Okada. |
| Journal Title: | Neo-Science of Natural History: Integration of Geoscience and Biodiversity Studies : Proceedings of International Symposium on "Dawn of a New Natural History - Integration of Geoscience and Biodiversity Studies" March 5-6, 2004, Sapporo |
| Start Page: | 147 |
| End Page: | 157 |
| Abstract: | We estimate up-to-date values of the average isotopic compositions of CO emitted from automobiles. In the estimation, we determined the isotopic compositions of CO in tail pipe exhaust for four gasoline automobiles and two diesel automobiles under varying conditions of both idling and running. While the dependence on the automobile manufacturer is little, each automobile equipped with functional catalytic converter exhibits a large temporal δ13C and δ18O variation. They tend to show 13C- and 18O-enrichment in accordance with the reduction of CO in exhaust, suggesting that the functional catalytic converter in engines enhances the δ13C and δ18O values of CO from tail pipes through a kinetic isotope effect during CO destruction. Assuming that automobiles run a modeled driving cycle, we estimated the average δ13C and δ18O of CO to be -23.8±0.8‰PDB and +25.3±1.0‰SMOW, respectively, for recent gasoline automobiles, and -19.5±0.7‰PDB and +15.1±1.0‰SMOW, respectively, for recent diesel automobiles. While the δ13C and δ18O values of recent gasoline automobiles coincide well with the isotopic compositions of source CO in present trunk road atmosphere estimated in this study, those are +4 to +6‰(δ13C) and +1 to +3‰(δ18O) higher than those reported previously and also those emitted from old, non-catalyst automobiles determined in this study. Recent improvements in functional catalytic converters have enhanced and will enhance the δ13C and δ18O values of CO from automobiles. |
| Description: | International Symposium on "Dawn of a New Natural History - Integration of Geoscience and Biodiversity Studies". 5-6 March 2004. Sapporo, Japan. |
| Conference Name: | International Symposium on "Dawn of a New Natural History : Integration of Geoscience and Biodiversity Studies" |
| Conference Place: | Sapporo |
| Type: | proceedings |
| URI: | http://hdl.handle.net/2115/38521 |
| Appears in Collections: | Neo-Science of Natural History : Integration of Geoscience and Biodiversity Studies > Proceedings
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