Studies on the flame ionization detector signal in the presence of organosilicon compounds : A method for the registration of the detector performance

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Abstract

A method is described by means of which the response curves of a flame ionization detector may be recorded on the basis of a single chromatogram. The column effluent is divided into two equal streams which simultaneously enter a reference detector and the detector being examined. The relation between the two detector signals is recorded with the aid of an X-Y recorder. Providing that the performance of the reference detector is linear, and by determining its response factor, the abscissa of the X-Y diagram represents a scale of mass flow rates, and the diagram itself the response curve of the detector tested. The method was used for the investigation of the FID performance when detecting organosilicon compounds. Inversion of the gas chromatographic peaks takes place and the response curves display a maximum under certain operating conditions. The shape of the response curves, the height and situation of the maximum depend on the detector voltage, the electrode gap, the flow rate of gases and the carbon/silicon ratio of the compound detected. The estimation of the carbon/silicon ratio on the basis of the maximum ion current is suggested.

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