HR: 1340h
AN: A13C-0933    [Abstracts]
TI: Development of Combined Analytical Method of Atmospheric CO2, CH4, and N2O by Gas Chromatograph
AU: * SUDO, S
EM: ssudo@niaes.affrc.go.jp
AF: National Institute for Agro-Environmental Sciences, 3-1-3 Kannondai, Tsukuba, 3058604 Japan
AB: CO2, CH4, and N2O are major greenhouse gases which concentrations in atmosphere are continuously increasing by various human activities. Although these species are observed many places in the world by several analytical techniques, precise knowledge about sources and sinks of these gases are progressive. Our study was focused on the methodology of effective monitoring of these gases above mentioned, especially gas exchange between atmosphere and terrestrial ecosystems. As gas fluxes from soil to air is necessary to be observed by difference of gas concentration during adequate time by closed chamber method, frequent measurement is required for precise estimation of the gas fluxes. Combined GC system for CO2, CH4, and N2O with using 3 detectors (TCD for CO2, FID for CH4, and ECD for N2O), 8 separation columns, 2 switching valves, and 2 GC ovens was designed and developed to measure three gases simultaneously. 1 or 2 mlSTP volume of air is required to measure each sample with analytical time is about 7 minutes. Ultra purified He gas was used as carrier gas with N2 and CH4 is used for make-up gases.
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 0322 Constituent sources and sinks
DE: 0330 Geochemical cycles (1030)
DE: 0394 Instruments and techniques
DE: 0426 Biosphere/atmosphere interactions (0315)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005