本文用气液色谱法测定各种溶质正戊烷、正己烷、正庚烷、正辛烷在各种溶剂正十六烷、正十七烷、正十八烷、正十九烷、正廿烷、正廿一烷、正廿二烷中的无限稀活度系数;测定各种溶质正戊烷、正已烷、正庚烷、正辛烷在各种不同配比的二元混合溶剂正廿二烷+正十六烷中的活度系数。 使用Flory-Huggins三元系公式,将三元系处理为假二元系,发现正构烷烃混合固定液所起的作用等价于与其数均分子量相同分子量的单一正构烷烃固定液所起的作用。 In this paper, various solutes n-pentane, n-hexane, n-heptane, n-octane in various solvents n-hexadecane, n-heptadecane, n-octadecane, n-nonadecane, Alkane, n-octane, n-octadecane in the infinite dilute activity coefficient; Determination of various solutes n-pentane, n-hexane, n-heptane, n-octane in various proportions of the binary mixed solvent is Activity coefficient in n-dodecane + n-hexadecane. Using the Flory-Huggins ternary system, the ternary system was treated as a pseudo-binary system and found that the effect of the n-alkane mixed fixative was equivalent to that of a single n-alkane fixative with the same molecular weight as the number average molecular weight effect.