气相色谱-质谱法检测乳与乳制品中20种邻苯二甲酸酯

建立了乳与乳制品中20种邻苯二甲酸酯气相色谱-质谱联用仪分析方法.样品用正己烷提取后,采用DB-5MS(30m×0.25mm,0.25μm)石英毛细管柱分离,在进样口温度280℃,传输线温度280℃,离子源温度230℃条件下20种邻苯二甲酸酯完全分离.该方法各组分的相关系数均大于0.9990,线性范围0～10μg/mL,样品加标回收率为80％～109％.邻苯二甲酸二异壬酯、邻苯二甲酸二异癸酯化合物检出限分别为1.0、0.5mg/kg,其他化合物均为0.05mg/kg.该方法具有简单易行,快速准确,灵敏度高等优点.

Determination of 20 Phthatic Acid Esters in Milk and Dairy Products by GC-MS

A method was developed for the determination of 20 phthatic acid esters in milk and dairy products by gas chromatography-mass spectrometry （GC-MS）. Samples were extracted with n-hexane and separated on a DB-5MS capillary column （30 m × 0.25 mm, 0.25 μm）. The injector temperature was 280 ℃,the interface temperature was 280 ℃, and the ion source temperature was 230 ℃. Under optimized conditions, the linear range was 0-10 μg/mL with a correlation coefficient greater than 0.9990. The average spike recovery rates were in the range of 80%-109%. The detection limits were respectively 1.0 and 0.5 mg/kg for DINP and DIDP and 0.05 mg/kg for 18 others. This method proved to be simple, rapid, sensitive, specific and accurate.