Improvement on the method for the determination of residual vinyl chloride and 1,1-dichloroethane in PVC resin

Improvements on the method for the determination of residual vinyl chloride and 1,1-dichloroethane in PVC resins were introduced.Good separation effects were obtained by adopting empty headspace method,GDX301(180~ 250 μm) chromatographic pillar with inner diameter 2 mm and length 1 m.The peak form was good.The recovery of standard sample added were 89.4%~104.0% for vinyl chloride and 102.4%~110.0% for 1,1-dichloroethane,the relative standard deviation were 0.51% for vinyl chloride and 1.11% for 1,1-dichloroethane,and the limits of detection were 0.02 μg/g for vinyl chloride and 0.1 μg/g for 1,1-dichloroethane.This method was simple to operate,needed less time,gave good chromatography separation effects and nearly linear standard curve,and the accuracy and precision met the requirement of analysis and determination.