The non-polar SP has the most data on RIs. Although the polar SP is more often used for nitrogen-149 containing UDMH transformation products , a number of studies used non-polar columns to analyze 150 one of the most toxic UDMH transformation products, N-nitrosodimethylamine . Furthermore, 151 non-polar 5% phenyl polydimethylsiloxane columns were also used for UDMH transformation products 152 before . Therefore, obtaining experimental RIs for the non-polar SP is of interest. of analyte) so that the substances came out with a narrow chromatographic peak. The peaks corresponding to the retention of these components had a very blurred profile (Figure ). In the study where the index for 1H-1,2,4-triazol-3-amine was calculated , there were no chromatograms to compare the obtained results.