Specific Features of the Gas Chromatography–Mass Spectrometry Identification of Monoalkyl Phthalates

Determination of Anomalies of Gas Chromatographic Retention Indices for Homologs Based on Their Homologous Increments

“…The parameters for GC-MS identification of monoalkyl benzene-1,2-dicarboxylates (monoalkyl phthalates) were considered in [8,9]. The chromatographic characteristics of this series have no anomalies: the i RI values of n-alkyl phthalates are well reproducible (the average value ± the standard deviation is 341 ± 14); if the alkyl fragment contains one branch, these estimates naturally decrease to 255 ± 25.…”

“…The data for monoalkyl phthalates were compared with the analogous characteristics of their closest structural analogs-dialkyl phthalates (dialkyl benzene-1,2-dicarboxylate) [8,9]. At the same time, it was unexpectedly found that the i RI values of di-nalkyl phthalates were not reproducible and significantly decreased at increased number of carbon atoms in n-alkyl fragments, from +125 (dimethyl phthalate) to -33 (didecyl phthalate), i.e., by ~160 index units.…”