Abstract
A Tandem Pyrolyzer which has two micro-furnaces in vertical position was developed. The temperature of two furnaces can be set up arbitrarily. Moreover, reagent gas such as air, oxygen, and others can be introduced into the 2nd micro-furnace to carry out chemical reaction between pyrolyzates of sample which thermally decomposed in the 1st micro-furnace and reagent gas. In this study, high sensitivity GC-MS was used as a detector for the tandem pyrolyzer. In case of study by using air as a reagent gas at the 2nd furnace, large amount of oxygen will flow into the MS ion source and may damage the filament. To avoid the problem, material and form of filament were examined. Chemical hazardous materials in the pyrolyzate of poly(vinyl chloride) were identified using a tandem pyrolyzer combined with a capillary GC-MS. On this study, poly(vinyl chloride) was pyrolyzed in the 1st furnace maintained at 600°C in helium, and then pyrolyztes were introduced again into the 2nd furnace in order to obtain the further information in air circumstances. As a result, aromatic compounds, acids, and aldehydes, in addition to a trace level of chlorinated aromatics such as pentachlorophenol which was one of precursor compounds of dioxin, also dioxins and PCBs were detected. The tandem pyrolyzer-GC-MS system is very powerful analytical tool to characterize the pyrolyzate of polymers in different circumstances.
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