Abstract
The determination of residual vinyl chloride (VC) in poly(vinyl chloride) (PVC) powders based on thermal desorbtion in a carrier gas stream and trapping of the VC is described. A trap is installed in the heated injection port of a gas chromatograph and desorbed volatiles are chromatographed by a two-stage chromatographic system. While VC is purged through an analytical column, the first column is cleaned by back-flushing. The method has been tested on various types of PVC powders and has no limit of sensitivity.
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