Retention index systems:: alternatives to the n-alkanes as calibration standards

The retention index systems based on homologous series or selected compounds differing from the n-alkanes series proposed by Kovats are reviewed and discussed. The reference series proposed for the identification of various kinds of organic compounds, on polar and non-polar columns and with universal or specific detectors, are described. Reference systems proposed for the identification of polyaromatic compounds and of polychlorobiphenyls are also compared. (C) 1999 Elsevier Science B.V. All rights reserved.