By W. L Ferrar

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23. TCD2 Hydrogen transfer system incorporated into a Chromatograph EQUIPMENT 35 sample In carrier in the detector. If a substantial part of the carrier gas can be removed between the column and the detector, then the concentration of sample in the detector rises and hence the sensitivity is increased. Palladium alloy can be used, as in the hydrogen transfer system, but to remove hydrogen continuously from the carrier gas rather than from the separated sample (Lovelock, Charlton and Simmonds, 1969).

There is then quite a long delay before ethane, carbon dioxide and ethene emerge in that order. This allows time, for example, to switch the first group on to a molecular sieve column, on which they can be completely separated before ethane elutes from the silica gel. Fish, Franklin and Pollard (1963) used silica gel for combustion products, which contained the gases described above and phosgene, hydrogen chloride and chlorine. Thornsbury (1971) described its use for Claus plant gases. Because of variations between batches, a carefully prepared type (Deactigel) was used.

1 that low molecular weight gases such as helium have an advantage in this respect. Over and above these general considerations the use of detectors which measure the difference in properties between carrier gas and eluted com­ ponent, such as the thermal conductivity detector, influence the choice of carrier gas considerably. When analysing gases, as opposed to liquids or solids, there is the possibility that the carrier gas is a component of the sample or that it has properties which are very similar to those of sample components.

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