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

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%.