Determination of 9 photo- initiators residues in food plastic packaging by dispersive solid phase extraction coupled with gas chromatograph- mass spectrometry

A simple and rapid analytical method was established for the determination of 9 photo- initiators in the food plastic packaging by dispersive solid phase extraction( d- SPE) coupled with gas chromatography- mass spectrometry( GC- MS). Photo- initiators were ultrasonically extracted by acetonitrile from samples,followed by concentrated under a stream nitrogen and then cleaned up by the mixed sorbents of 150 mg anhydrous Mg SO4,50 mg primary secondary amine( PSA) and 50 mg octadecylsilane( C18). The ultimate solution was detected by GCMS with external standard method for quantitation under selected ion monitoring mode.All of the 9 photo- initiators had good linear relationships in the concentrations of 0.02 to 1 mg / L,and the R2> 0.999.The recoveries of 9 photoinitiators were in the range of 82.9% ~118.9% at three spike levels of 0.05,0.5 and 1mg / L,and the relative standard deviations( RSD) were 0.9% ~10.5%.The limit of quantification( LOQ) for all analytes were range from 0.07 mg / kg to0.33 mg / kg.The method was sample,good purification effect,the sensitivity and precision meet the photo- initiator detection requirements,and it could be used for the determination of the residues of photo- initiators in the food plastic packaging.