Objective To establish a method for the determination of phthalic acid esters in infant formula milk powder and raw materials by gas chromatography-mass spectrometry (GC-MS). Methods Samples were extracted with acetonitrile, and then detected by GC-MS. The external standard method was conducted for the quantitative analysis. Results The linear range of 15 phthalic acid esters were 0.001~1 mg/L, except that the linear range of phthalate isononyl ester was 0.01~1 mg/L with R>0.99. LOD (S/N=3) and LOQ(S/N=10) were 0.006~0.2 mg/kg and 0.02~0.7 mg/kg, respectively. The recoveries were 88.6%~117.2% at three spiked level with relative standard deviation of 1.0%~9.3%. Conclusion This method is simple, accurate, fast, cheap and stable, and it is suitable for the detection of phthalic acid esters in milk powder.
标题:气相色谱-质谱法测定婴幼儿配方乳粉及原料中 15 种邻苯二甲酸酯
英文标题:Determination of 15 phthalic acid esters in infant formula milk powder and raw material by gas chromatography-mass spectrometry