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From normalisation to harmonisation: new methods for reducing the variability in GC analysis of natural gas.

Milton, M J T; Vargha, G; Brown, A S (2004) From normalisation to harmonisation: new methods for reducing the variability in GC analysis of natural gas. In: 3rd International Gas Analysis Symposium, 6-8 October 2004, Amsterdam, Neatherlands.

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Abstract

The results of gas chromatographic analysis of natural gas mixtures usually have highly correlated variations due to changes in the sample size and detector response. Although correction for ambient pressure variations can reduce this variability, normalisation of the results of each analysis using the assumption that the sum of all component amount fractions is unity can provide significantly greater (over an order of magnitude) reduction in the uncertainty of each measured component.

The new method of “harmonisation” takes the normalisation process one step further by harmonising the calibration curves for each component in order to reduce correlated variations in sample size that are common to the same sample. This approach requires a non-linear least square calculation and can result in reductions in the uncertainty of the results of more than a factor of ten. It has the advantage that, unlike normalisation, it is not necessary to measure all of the components.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Subjects: Analytical Science
Analytical Science > Trace Analysis and Electrochemistry
Last Modified: 23 Jul 2018 12:50
URI: http://eprintspublications.npl.co.uk/id/eprint/3100

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