摘要
The accurate determination of the nonretained tlme（to） is essential to the evaluation of column efficiency in high performance liquid chromatography. In the normal phase mode, some suggested the use of CCl4 as a nonretained solute, while Halasz believed that a homolog with a carbon atom less than the eluant molecule is really unretained. The former seems questionable, and the latter has not yet been verified. In our experiment, the retentions of C5-C10 saturated aliphatic hydrocarbons as well as CCl4 were checked, where n-hexane or heptane was used
