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用ＧＤＸ－４０１为固定相，对二甲醚纯度进行色谱分析，两种主要杂质———水和甲醇与主成分分离良好，甲醇和水的标准相对偏差分别为０．４６％和１．１％。
With GDX-401 as the stationary phase, the purity of dimethyl ether was analyzed by chromatography. The two main impurities --- water and methanol separated well from the main components, and the relative standard deviations of methanol and water were 0.46% and 1.1 %.