【求助】nonretarded compound 学生请教这是什么化合物

The elution of the compound is characterized by the partition ratio, k',a dimensionless quantity also called the capacity factor. It is equivelent to the ratio of the time required for the compound to flow through the column (the retention time_to the retention time of a nonretarded compound

组分流出时间因分配比k的不同而出现差异，k，一个无量纲的常数，又叫保留因子，等于两个组分调整保留时间（保留时间和不受柱子滞留组分的保留时间之差）的比。

注：这个不受柱子滞留组分的保留时间，一般我们称为死时间。