单滴微萃取-气相色谱法测定塑料食品包装浸出液中邻苯二甲酸酯类物质

Determination of Trace Phthalic Acid Esters in Leaching Solution of Plastic Food Packaging by Single-Drop Microextraction-Gas Chromatography

建立了基于单滴微萃取(SDME)结合气相色谱法测定塑料食品包装浸出液中3种邻苯二甲酸酯类物质含量的新方法。研究了萃取溶剂、萃取时间及搅拌速度等因素对萃取效率的影响,确定萃取的最佳条件:以1.4μL二甲苯为萃取剂,萃取时间为20min,萃取温度为40℃,搅拌速度为200r/min。在最优条件下,该方法的线性范围为0.1～100μg/mL,检出限为0.01μg/mL,实际样品的加标回收率为97%～113.9%。本法具有简单、快速和成本低等特点。

The determination methods for three kinds of phthalic acid esters in leaching solution of plastic food packaging using Single-drop microextraction（SDME） couple with gas chromatography-hydrogen flame ionization detector（GC-FID） was developed in this study.The optimum conditions for the assay were detected and listed as follows： with 1.4 μL xylene as the organic extractant,extraction time 20 min,the extraction temperature 40℃,stiring speed 200 rpm.Under the optimum conditions,the DMP,DEP and DBP had the linear range of 0.1-100 μg/mL and the detection limits were 0.01 μg/mL.The actual sample recovery was 97-113.9% d.This method is proved to be a simple,fast and low cost approach for determination of trace phthalic acid esters in leaching solution of plastic food packaging.