建立固相萃取-气相色谱-串联质谱法同时测定牛奶中9种N-亚硝胺的分析方法。在10.0 g牛奶样品中加入10 mL乙腈提取9种N-亚硝胺，Captiva EMR-Lipid固相萃取小柱净化提取液，低温微流氮吹浓缩净化液，气相色谱-串联质谱仪采用多反应监测（MRM）模式测定，内标法进行定量。9种N-亚硝胺的线性范围均为0.5~37.5 μg·kg^-1，检出限（3S/N）为0.003~0.043 μg·kg^-1。按标准加入法进行回收试验，回收率为78.7%~124%，测定值的相对标准偏差（n=6）均小于6.0%。

A method was established for the simultaneous determination of 9 N-nitrosamines in milk by gas chromatography tandem mass spectrometry (GC-MS/MS) with solid phase extraction. The 9 N-nitrosamines in milk (10.0 g) were extracted with 10 mL acetonitrile, and purified with Captiva EMR-Lipid solid phase extraction cartridge, and then the purified liquid were concentrated with low temperature and microflow nitrogen. The target compounds were detected by GC-MS/MS under multi-reaction monitoring (MRM) mode, and internal standard method was used for quantitative analysis. The results showed that the linearity ranges for 9 N-nitrosamines were all found in the same range of 0.5-37.5 μg·kg^-1, with detection limits (3S/N) between 0.003 to 0.043 μg·kg^-1. Test for recovery was made by standard addition method, giving results in the range of 78.7%-124%, and RSDs (n=6) of the determined values all less than 6.0%.