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甲醇中微量乙醇及乙醇中微量甲醇的分离与分析一直是人们颇为关注的问题。由于高含量的峰易将低含量的峰掩盖,使二者难于分离或分离度很小。文献报道,选用D-山梨醇为固定液,6201为载体需填装5—8m长色谱柱方可使乙醇和甲醇较好分离;选用聚乙二醇-20M为固定液,硅烷化白色405为载体,分离白酒中各组分,甲醇和乙醇色谱峰分离度很小;Mangani等人应用色谱法直接测定果酒中甲醇含量,检测限为≈0.05％。 本文采用南开大学高分子化学研究所研制的新型大孔聚合物小球NKG-1为载体,涂渍10％聚乙二醇-20M,仅用2m长不锈钢柱,可将甲醇和乙醇较好分离,用于定量分析其准确度、精密度均较好,检测限可达0.005％。
The separation and analysis of trace amounts of methanol in methanol and ethanol in methanol has been a subject of considerable concern. Due to the high content of the peak is easy to cover the low content of the peak, making the two difficult to separate or separation is very small. Reported in the literature, the selection of D-sorbitol as the stationary phase, 6201 as a carrier to be filled 5-8m long column ethanol and methanol can be better separation; selection of polyethylene glycol-20M as a stationary phase, silylated white 405 Carrier, the components of liquor were separated and the separation of methanol and ethanol peaks was very small. Mangani et al. Used the direct determination of methanol content in the wine by chromatography, the detection limit was ≈0.05%. In this paper, a new macroporous polymer beads NKG-1 developed by Institute of Polymer Chemistry, Nankai University, was used as a carrier, coated with 10% polyethylene glycol-20M, only 2m long stainless steel column, methanol and ethanol can be better separated , For quantitative analysis of its accuracy, precision are better, the detection limit of up to 0.005%.