GAS SYRINGE SAMPLING AT VERY LOW-PRESSURE

A new sampling technique is developed for flame samples taken at very low pressure (50 Torr absolute). This technique uses gas syringes. Analysis is by gas chromatography and the compounds of interest are the fixed gases and selected C1 and C2 hydrocarbons and chlorinated hydrocarbons. Linear response factors are obtained for all compounds. This is highly unusual for gas-phase chlorinated hydrocarbon sampling, which is very prone to sample absorption. The sources of experimental error unique to gas syringe use are identified and quantified. One error source is exacerbated by the very low sample pressure and requires special treatment.