Patent ID: 6447575
Filing Date: 2002-09-10
Classification: G01N

Abstract:
A method for gas chromatography analysis of a sample after preceding thermodesorption, in which the components to be separated and water are contained,wherein the thermodesorbed sample is transferred by means of carrier gas into a first polar separation column which retains higher-boiling components and water and passes low-boiling components, said low boiling components being led, past a branching device which leads, on the one hand, to a second separation column of the group of a non-polar and a polar separation column and, on the other hand, to a third non-polar separation column, to the third non-polar separation column in a manner excluding access to the second separation column, after which the higher-boiling components and the water are lead to the second separation column in a manner excluding access to the third non-polar separation column, the water being eliminated upstream of the second separation column by means of cryofocussing.