Abstract: An analytical method was established by gas chromatography-mass spectrometry (GC-MS) for the simultaneous determination of the contents of 16 polycyclic aromatic hydrocarbons (PAHs) in infant formula. This method was applied to survey the levels of PAHs pollution of 45 infant formula samples sold online. The sample pretreatment procedure was optimized and the figures of merit of the method including linearity, precision and spiked recovery were examined. The external standard method was used for quantitation. The linearity of the method was good in the concentration range of 1–100 ng/ mL (r > 0.999), and the limit of detection (LOD) was 0.01–0.10 μg/ kg. The average recoveries at spiked concentration levels of 5, 10 and 50 μg/kg were in the range of 76.2%–103.1%, and the relative standard deviation (RSD) for precision was less than 10%. The detection rate of PAHs was 86.7% from 15 infant formula samples for babies of 0–6 months at levels of 0–1.12 μg/kg. The detection rate of PAHs was 80.0% from 15 infant formula samples for babies of 6–12 months at levels of 0–0.75 μg/kg. The detection rate of PAHs was 60% from 15 infant formula samples for babies of 12–36 months at levels of 0–0.60 μg/kg.

Key words: gas chromatography-mass spectrometry, polycyclic aromatic hydrocarbons, infant formula, detection rate, pollution

摘要： 采用气相色谱-质谱法，建立同时测定婴幼儿配方乳粉中16 种多环芳烃含量的分析方法，并对网购45 份婴幼儿配方乳粉中多环芳烃的污染水平进行调查研究。通过优化前处理方法，考察方法的线性关系、精密度、加标回收率及检出限等参数，采用外标法定量。结果表明：该方法中16 种多环芳烃在1～100 ng/mL范围内均线性良好（r＞0.999），检出限为0.01～0.10 μg/kg；5、10、50 μg/kg水平下的平均加标回收率为76.2%～103.1%，相对标准偏差均小于10%；调查的45 份婴幼儿配方乳粉样品中，0～6 月龄乳粉多环芳烃检出率为86.7%，含量为0～1.12 μg/kg，6～12 月龄乳粉检出率为80.0%，含量为0～0.75 μg/kg，12～36 月龄乳粉检出率为60.0%，含量为0～0.60 μg/kg。

关键词: 气相色谱-质谱法, 多环芳烃, 婴幼儿配方乳粉, 检出率, 污染