Determination of ethylene glycol,diethylene glycol,triethylene glycol and tetraethylene glycol in polyethylene glycol 200 by gas chromatography
A gas chromatography-hydrogen ion flame method for the determination of ethylene glycol,diethylene glycol,tri-ethylene glycol and tetraethylene glycol in polyethylene glycol 200 was established.Polyethylene glycol 200 was diluted with primary water and measured directly.The pretreatment operation was simple.The linear correlation coefficients of ethy-lene glycol,diethylene glycol,triethylene glycol and tetraethylene glycol were all greater than 0.99.The recoveries were 93.9%-116.9%,and the mean relative standard deviations(RSD)were 0.19%-1.40%,respectively.The method is simple,rapid and accurate,and can meet the needs of the determination of ethylene glycol,diethylene glycol,triethylene glycol and te-traethylene glycol in PEG 200.