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介绍一种用差减色谱研究小分子溶质对混合溶剂中某种组分优先吸附的方法. 在该方法中,淋洗剂是混合溶剂, 进样试液由溶质溶于混合溶剂制得. 通过测定自由溶剂峰的尺寸, 得到优先吸附参数λ2 (λ2 为周围溶剂化溶剂中某种溶剂组分的超额量与溶质重量之比). 用该方法对由丙三醇与水-乙醇混合溶剂所组成的体系进行研究发现, 当混合溶剂中乙醇的质量浓度低于2%时, 丙三醇对溶剂组分的优先吸附可忽略; 当乙醇质量浓度达到5%时, 丙三醇对乙醇优先吸附; 当乙醇质量浓度在10% ~23%时, 丙三醇对水优先吸附; 当乙醇质量浓度在30% ~60%时, 丙三醇优先吸附的溶剂组分又变成了乙醇.
Describes a method using differential subtractive chromatography to study the preferential adsorption of a small molecule solute on a component of a mixed solvent in which the eluent is a mixed solvent and the sample solution is prepared by dissolving a solute in a mixed solvent, The size of the free solvent peak is determined to give a preferential adsorption parameter λ2 (λ2 is the ratio of the excess amount of a solvent component in the surrounding solvation solvent to the solute weight) The results showed that when the mass concentration of ethanol in the mixed solvent was less than 2%, the preferential adsorption of glycerol on the solvent components was negligible. When the mass concentration of ethanol reached 5%, glycerol preferentially adsorbed on ethanol When the mass concentration of ethanol was between 10% and 23%, glycerol preferentially adsorbed on water. When the mass concentration of ethanol was between 30% and 60%, the solvent components preferentially adsorbed on glycerol turned into ethanol.