Patent ID: 6357277
Filing Date: 2002-03-19
Classification: G01N

Abstract:
A method for obtaining the reproducibility of the retention times of the components of a mixture analyzed in a gas chromatographic equipment after the replacement of the used capillary column with a nominally equal one, characterized by the following steps:I) calculating a K coefficient characteristic of the column by flowing through the column carrier gas under stabilized conditions of carrier gas pressure and flow rate and of the column temperature, measuring parameter values of the carrier gas pressure at column inlet (Pin), of carrier gas mass flow rate (Fm) and of the column temperature (Tc), and measuring or setting the carrier gas pressure at column outlet (Pout), and entering such values in the following equation: K=Fm&it;Tc1+Î±pi&it;â€ƒ&it;n2-pout2â€ƒwhere: &agr; is a settable experimental exponent, depending on the carrier gas nature; II) storing said K coefficient in a memory of the gas chromatographic equipment; and III) using said K coefficient to correlate at least two of above mentioned parameters in subsequent analyses.