Summary
Today, mini computers (e. g., HP-65) are available in a pocket version. They can be programed quickly, simply and very effectively. Thus, mathematical algorithm can be used for retention index calculations from nonadjusted retention time data using an iteration. Although sometimes the true data of retention index, as a function of the adjusted retention time, are non linear, it can be shown that linearization of this function — together with linear regression — is of great practical value. Another improvements are achieved by using nonalcanes as an inner standard in qualitative routine analysis of medium to high polar compounds, as well as by using the retention index as the address for correction factors for quantitative analysis and as the command to start any type of program in gas chromatography, e. g., temperature programs, column switching programs, detector switching programs, and all switching programs in preparative gas chromatography. This is true because retention index data are in minimum by a factor of ten more precise than other measure in qualitative gas chromatography. Algorithms used and programs for the HP-65 pocket computer are given.