采用气相色谱，结合红外光谱技术，对食品包装用PET容器中二甘醇的存在状态、含量以及迁移规律进行了系统研究，同时建立了一种快速准确检测PET食包容器中二甘醇总量和单体含量的外标方法。结果表明，二甘醇以链间醚键和游离单体2种形态并存于PET中，并以醚键形式为主；迁移结果表明，在最苛刻的条件下，二甘醇在酸类食品中的迁移量最大，并且随温度的升高和迁移时间的延长而增加。

By combining GC and FTIR characterization, the existing form, content and migration of diethylene glycol (DEG) in PET container for food packaging were investigated. In addition, a fast and accurate external standard method was established to determine the total quantity and monomer quantity of DEG remained in PET container. The results showed that DEG molecules existed in the PET are in the form of interchain aether bonds and monomers, and the previous form dominates. Furthermore, the DEG migration results revealed that the migration quantity is the highest in an acid food simulant under the most severe condition; the migration quantity increases with temperature rising and time extending.