Analysis of uncertainties in gas uptake measurements using the gravimetric method

A full analysis of the uncertainties in the calculation of the amount of gas absorbed or desorbed by a sample using the gravimetric technique has been made. The gravimetric technique provides a near direct measurement of the uptake of gas by continuously measuring the weight of the sample plus absor...

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Bibliographic Details
Published in:International journal of hydrogen energy 2014-04, Vol.39 (13), p.7158-7164
Main Authors: Webb, C.J., Gray, E.MacA
Format: Article
Language:English
Subjects:
Alternative fuels. Production and utilization
Applied sciences
Buoyancy
Constants
Energy
Exact sciences and technology
Fuels
Gravimetric
Gravimetric analysis
Hydrogen
Hydrogen storage
Hydrogen storage materials
Mathematical models
Uncertainty
Uncertainty analysis
Uptakes
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Summary:A full analysis of the uncertainties in the calculation of the amount of gas absorbed or desorbed by a sample using the gravimetric technique has been made. The gravimetric technique provides a near direct measurement of the uptake of gas by continuously measuring the weight of the sample plus absorbed gas and is frequently used to characterise the uptake of hydrogen in potential hydrogen storage materials. These calculations provide the capability to determine the uncertainty in the final gas uptake measurement given knowledge of the measurement uncertainties. Uptake of hydrogen gas on activated carbon has been modelled to allow individual constants such as the buoyancy volumes as well as measurement uncertainties to be changed while determining the effect on the uptake uncertainty. The measurement uncertainties critical to minimising the overall uptake uncertainty have been identified and a comparison with another popular gas uptake method, the Sieverts technique, has been made. •Full analysis of uncertainties in the gravimetric method for gas uptake measurements.•Hydrogen uptake modelled to vary individual uncertainties.•Maximum total uncertainty investigated as a function of initial uncertainties.•Comparisons with the Sieverts technique.•Formulae provided for the calculation of uncertainties in hydrogen uptake.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2014.02.154