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A comparative analysis of retention characteristics obtained on fused silica capillary columns available from various manufacturers is performed. The retention indexes for organic compounds of different chemical classes (octanol-1, 2,6- dimethylphenol, 2,6-dimethylaniline, naphthalene, methylpelargonate) are measured on the columns. The maximum variation in retention indexes is 1,63 i.u. on the columns coated with nonpolar stationary liquid phase (polydimethylsiloxane) and 16.26 i.u . on those coated with polar that (polyethylene glycol). The average maximum variation in the retention indexes obtained on the polyethylene glycol columns is more than that on the polydimethylsiloxane columns by a factor of 5. The established variation in columns selectivity from various manufacturers must be taken into account both in routine chromatography, in studies of phys ic- ochemical characteristics and when compiling of data bases.

A comparative analysis of retention values obtained on fused silica capillary columns from various manufacturers