Highly accurate gas chromatographic analysis of reference gases for use in vehicle emission measurements |
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Authors: | D. Schiel K. Röhker |
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Affiliation: | (1) Physikalisch-Technische Bundesanstalt, D-33116 Braunschweig, Germany, DE |
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Abstract: | A highly accurate gas chromatographic analytical method has been developed for the determination of the composition of gas mixtures. It was tested using a reference gas as an example consisting of 3.5% of CO, 14% of CO2, 0.2% of propane and residual N2 intended for the use in vehicle emission measurements. The method is based on comparison measurements with samples of a calibration gas, whose composition is iteratively adapted to that of the sample investigated using a gravimetric gas mixing method. For the gas chromatographic measurement, a molecular sieve column and a polymer column are used in parallel and in isothermal operation. All gas components can be determined by a single gas chromatographic measurement, and the relative uncertainty of measurement achievable is ?0.4%. |
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