关键词: GC-MS, 聚氨酯, N, N-二甲基甲酰胺

Abstract: A method based on gas chromatography-mass spectrometry (GC-MS) was developed to determine the content of N, N-dimethylformamide (DMF) in polyurethane (PU) products. DMF in PU sample was ultrasonically extracted using ethyl acetate as solvent, and the extracting solution was then purified with membrane filter. Under the ion monitoring (SIM) mode, DMF was determined using GC-MS with HP-INNOWAX chromatographic column as the stationary phase. Retention time and the abundance ratio of the characteristic fragment ions were adopted for the qualitative analysis, while quantification analysis was performed using an external standard method. Results indicate that a linear calibration curve of DMF can be obtained in the range of 0.2-10 mg/L, and the detection limit is 0.46 mg/kg. The spiked average recoveries varied from 92.9% to 98.7% at three spiked levels with relative standard deviation (RSD, n=6) of 6.5%-7.7%. The present method is accurate, reliable and convenient, and could be applied in the determination of DMF in PU products.

Key words: GC-MS, polyurethane products, N, N-dimethylformamide