May 01, 2017 · Gas chromatography is generally used to determine residual solvents because of its excellent separation abilities and low limit of detection. In gas chromatography the sample is either dissolved in a suitable solvent than injected directly (DI) ( Haky and Stickney, 1985 , Smith and Waters, 1991 ) or by headspace sampling ( Markovich et al
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By evaporation - changing of state from liquid to gas - the volume of the sample increases by a factor up to 20,000. In the condenser the gas is re-condensed to a liquid and the volume shrinks immediately. During this evaporation-condensation process, vapor velocity at narrow points of the glass apparatus can be up to 150 km/h.
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