气相色谱测定食品中酞酸酯类化合物的方法研究

Study on an Approach to Determining Phthalate Esters in Foods by Gas Chromatography

摘要: 目的探讨食品中5 种常见酞酸酯类环境污染物的气相色谱测定方法。

方法采用有机溶剂超声提取、中性氧化铝柱过柱净化和氮吹浓缩的前处理技术,用气相色谱- 氢火焰离子化检测器(GC-FID)测定。

结果 5 种酞酸酯类化合物(PAEs)取得较好分离效果,标准曲线的相关系数均大于0.999,平均加标回收率为82.0%~101.0%,相对标准偏差(RSD)为2.8%~7.3%,方法最低检出限为2.0~8.6 μg/kg。

结论该方法操作简便快捷、经济、灵敏度高,适用于一般实验室开展日常食品监测和检测。

Abstract: Objective To develop an approach to determining five common environment-polluted phthalate esters(PAEs) in foods by gas chromatography(GC).

Methods After extracted from organic solvent by ultrasonic, cleaned by Alumina N column and concentrated by nitrogen, PAEs in the samples were determined by gas chromatography-flame ionization detector(GCFID).

Results Five PAEs were well-separated from each other. The study showed the correlation coefficients between them were all above 0.999; the average spike recovery rates and the relative standard deviations(RSDs)were in the range of 82.0% to 101.0% and 2.8% to 7.3% respectively; the limits of detection(LODs)were between 2.0 μg/kg and 8.6 μg/kg.

Conclusion The approach was found simple, convenient, economic, sensitive, and applicable to everyday monitoring and inspection of foods for laboratories.