建立了用毛细管柱气相色谱法测定水性涂料中三种乙二醇醚(乙二醇单甲醚、乙二醇单乙醚、乙二醇单丁醚)的方法.涂料用乙醇和石油醚(3+1)混合溶剂超声提取,经高速冷冻离心,上层清液用无水硫酸钠脱水,经过0.45 μm滤膜过滤后进行气相色谱分析.用保留时间定性,外标法定量.回收率在84.3%-110.8%范围,RSD为0.40%-2.32%,检出限为2.5 μg·g-1.

Three analogues of ethyleneglycol ether,namely,ethyleneglycol monomethyl ether(EGMME),ethyleneglycol monoethyl ether(EGMEE) and ethyleneglycol monobutyl ether(EGMBE),were determined by gas chromatography using capillary column (HP 20 M,25.0 m×0.32 mm i.d.,0.20 μm).The sample was extracted ultrasonically with a mixture of ethanol and petroleum ether mixed in the ratio of 3 to 1 by volume.The extract was separated by freezing centrifugation at high speed.The separated upper clear layer (the extract) was then dehydrated by anhydrous sodium sulfate,and filtered through a 0.45 μm filtering membrane.The filtrate was ready for GC analysis.Qualitative analysis was done by using retention time.Quantitative analysis was carried out by the external standard method basing on the linear relationships between the peak area and concentration of the 3 analogues of ethyleneglycol ether in definite ranges.Precision and accuracy of the preposed method were tested,giving RSD′s in the range of 0.40%-2.32%,and recoveries in the range from 84.3% to 110.8%.Detection limit of this method was found to be 2.5 μg·g-1 for any of the 3 analogues.