Abstract:

In this study， a reliable gas chromatography⁃mass spectrometry method was developed for simultaneous determination of five novel flame retardants， including 4⁃tert⁃butylphenyl diphenyl phosphate （MDPP）， 2⁃ethylhexyltetrabromobenzoate （TBB）， bis（4⁃tert⁃butylphenyl）phenyl phosphate （DBPP）， tris（p⁃t⁃butylphenyl）phosphate （TBPP）， and bis（2⁃ethylhexyl）⁃2，3，4，5⁃tetrabromophthalate （TBPH）， in recycled plastics. The method employed ultrasonic⁃assisted methanol extraction， followed by separation on a DB⁃5HT capillary column （15 m×0.25 mm×0.10 μm） with temperature programming. Identification and quantification were performed using both full scan and selected ion monitoring modes with external standard calibration. The method demonstrated excellent linearity （R²>0.998） across a concentration range of 0.05~10 mg/L. Method validation showed detection limits of 0.12~0.18 mg/kg and quantification limits of 0.40~0.60 mg/kg. Average recoveries at three spiking levels （0.5， 20 and 100 mg/kg） ranged from 95.7 % to 106.4 %， with relative standard deviations （RSDs， n=7） between 0.2 % and 5.1 %， confirming the method's accuracy and precision for analyzing these emerging contaminants in plastic matrices.

Key words: gas chromatography?mass spectrometry, recycled plastic, novel flame retardants