APPLICATIONS OF THE DEFERRED STANDARD TECHNIQUE IN PROCESS GAS-CHROMATOGRAPHY

Abstract Three applications of the deferred standard (DS) technique in on-line gas chromatographic analysis with a rotary injection valve are reported. It is demonstrated how both absolute and relative measurements are affected by several deviations of the experimental conditions, such as atmospheric pressure, sample injection during either flow or stopped-flow conditions and instrumental settings (carrier gas flow-rate, column oven temperature, detector bridge current) of the analytical system. It is shown that the relative DS concept provides an excellent means of improving the reliability of the analytical equipment. Under standard conditions, accurate results were obtained with a relative standard deviation