Abstract

A chemical modulation device for correlation chromatography (CC) is proposed and tested. The modulation process is a chemical reaction on the surface of a hot metal wire in an air atmosphere at a slightly elevated pressure. The influence of several experimental parameters on the modulation efficiency is discussed and modulation efficiency curves are presented for some organic components and a few modulator configurations. Coiled-wire modulators are found to be preferable to straight-wire types. A 100% modulation efficiency can be accomplished resulting in the normal correlation chromatographic gain in signal-to-noise ratio. By using carefully chosen operating parameters the modulator can more or less selectively modulate certain categories of compounds. The calculated correlograms contain ghost peaks. The influence of experimental parameters on the amplitude and sign of the ghost peaks is investigated. A well known correction method is applied and is found to work satisfactorily. A linear response curve was found for ethane—air mixtures. A duty-cycle injection control signal was used to obtain ghost peak-free correlograms. The use of this non-mechanical injection device is limited by the lifetime of the wire.

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