Abstract
Both, isothermal (Kovats) and linear temperature programmed retention indices, were determined for nitro-alkanes, nitro-aromatics, and explosives on a J&W 0.2 mm diameter, 30 meter DB-5 column with a 0.25 micron film thickness. A Hewlett Packard Model 5890 gas chromatograph, equipped with a split/splitless injector at 145 ° C and a Model 5970 mass spectrometer or a flame ionization detector were used to obtain the data. The gas chromatograph was operated isothermal at 140 ° C or linear-temperature programmed from 40 °C to 300 ° C at a rate of 5 °C per minute. Within a homologous series, the linear-temperature programmed retention indices are a linear function of the boiling point. In general, the linear-temperature programmed retention indices are a linear function of the retention time. These data are being used to form a retention-index data base for the identification of explosives compounds by gas chromatography.
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