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预分离色谱法可直接测定混合物中微量组份的无限稀释活度系数(γ~∞),而不必把此组份从混合物中分离出来。主要由四步组成:被测组份的预浓缩,被测组份的定性,选择预分离柱和γ~∞的测定。预浓缩样品经过预分离柱分出被测组份,然后进入测量柱测定γ~∞。此方法简捷、可靠与常规以纯溶质进样的色谱测y~∞的方法具有相同的测定精度,可广泛用于缺少纯样的场合。用此法测定了戊烯-1-炔-4、丁炔-2在若干酸醇中的γ~∞,分别求得了修正和未修正的UNlFAC参数,对kikic修正模型其值为ac=c,CooH=694.9(K)acooH,c=c=-99.08(K),ac=c,oH=812.99(K),aoH,c=c=143.36(K)
Pre-separation chromatography allows direct determination of the infinite dilution activity (γ ~ ∞) of trace components in a mixture without having to separate this component from the mixture. Mainly consists of four steps: the preconcentration of the tested components, the qualitative determination of the tested components, the choice of pre-separation column and γ ~ ∞ determination. The preconcentrated sample is separated by a pre-separation column to determine the components to be measured, and then enters the measurement column to measure γ ~ ∞. This method is simple, reliable and routine with pure solute injection chromatographic method y ~ ∞ measurement method with the same accuracy, can be widely used in the absence of pure sample of the occasion. This method was used to determine the γ ~ ∞ of penten-1-yne-4 and butyne-2 in some acid alcohols. The modified and uncorrected UNlFAC parameters were obtained respectively. The values of kikic correction model were ac = c, C = c = -99.08 (K), ac = c, oH = 812.99 (K), aoH, c = c = 143.36 (K)