Abstract
Anomalous temperature dependence of gas chromatographic retention indices, RI ( T ), of polar analytes on non-polar stationary phase (BPX-1) was re-considered on the example of compounds of different chemical origin (dimethyl formamide, dimethyl sulfoxide, etc.). This anomaly, revealed first at 1990s – beginning of 2000s implies the variations in the signs of temperature coefficients, b = dRI / dT , that leads to the appearance the minima of retention indices. The more detailed characterization of this anomaly permits us to conclude that the total view of the dependencies RI ( T ) is determined by the amounts of analytes being injected into GC column, but no effects of column overloading the column are observed. The phenomenological explanation of the effects observed is the increasing the asymmetry of chromatographic peaks of polar analytes on non-polar phases at the lower temperatures. Key words : gas chromatography, polar analytes, non-polar stationary phases, retention indices, abnormal temperature dependence. (Russian) DOI: http://dx.doi.org/10.15826/analitika.2014.18.2.005 Igor G. Zenkevich, Alexander A. Pavlovskii St. Petersburg State University, St. Petersburg, Russian Federation
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