Determination of 7 residual monomers in acrylonitrile-styrene plastic by gas chromatography with head space sampler

A reliable method had been developed for determination of 7 residual monomers in acrylonitrile styrene(AS) plastic by headspace-gas chromatography.The samples were completely dissolved into N,N-diethylformamide,and then the gas after achieved equilibrium in the headspace bottle was extracted by headspace injection equipment for gas chromatography analysis.The optimum conditions of gas chromatography and headspace injection were obtained by experiments.The optimum conditions of headspace injection were usage of solvent 3mL,heating temperature 120℃,time for equilibrium 40min.The average recoveries of 7 residual monomers were 95.71%～106.89%,the detection limits were 0.25～1.0mg/kg.The analysis method not only improved detection efficiency,but also cut down the detection cost.Meanwhile,this method was simple,rapid,accurate,and sensitive.