死时间(t_M)是色谱基本参数之一,早为人们关注,后来更为突出,其值可用空气或甲烷测定或间接计算。近年来对用甲烷和用计算法确定t_M的可靠性产生了对立的看法。为此,我们从实验角度,在不同仪器上,对几种固定相色谱柱,在较广的柱温范围和不同载气的条件下,用不同方法、不同物质来确定t_M,并用它们来计算各种组分的保留指数(I),以此来考察确定t_M的方法的适用性。 Dead time (t_M) is one of the basic parameters of the chromatogram, as early as people concern, and later more prominent, its value can be measured by air or methane or indirect calculation. In recent years, there has been a contradictory view on the reliability of using methane and the calculation of t_M. To this end, we experimentally, on different instruments, several stationary phase columns, in a wide range of column temperature and different carrier gas conditions, using different methods, different substances to determine t_M, and use them to calculate The retention index (I) of the various components was used to examine the applicability of the method for determining t_M.