熔化提取-毛细管气相色谱法测定乙二醇硬脂酸酯中乙二醇的残留量

Capillary Column-GC Determination of Residual Amount of Ethylene Glycol in Ethylene Glycol Stearate with Fusion Extraction

摘要: 提出了毛细管气相色谱法测定乙二醇硬脂酸酯中乙二醇残留量的方法。样品在50 ℃熔化,经甲醇超声浸提,以丙二醇为内标,采用HP-5毛细管色谱柱分离,用火焰离子化检测器测定。乙二醇的质量浓度在102.6~1 026.0 mg·L-1范围内呈线性,方法的检出限(3S/N)为30 mg·L-1。应用此方法分析乙二醇硬脂酸酯,回收率在93.7%~103.2%之间。

Abstract: Residual amount of ethylene glycol in ethylene glycol stearate was determined by capillary column GC. The sample was melted at 50 ℃ ultrasonically and extracted with methanol. Propylene glycol was used as internal standard. An aliquot of the extract was separated on HP-5 capillary column and determined with FID. Linearity range of ethylene glycol was kept from 102.6 to 1 026.0 mg·L-1, with value of detection limit (3S/N) of 30 mg·L-1. The proposed method was applied to the analysis of ethylene glycol stearate, values of recovery found were in the range of 93.7%-103.2%.