Abstract
Thin-layer chromatography (TLC) combined with photometry has been used successfully for the simultaneous determination of PETriN, DiPEHN, and TriPEON in PETN samples. The impurities are separated by one-dimensional TLC on Silica Gel G-Zn-sodium sulfanilate plates with an acetone-benzene mixed solvent. When the chromatogram is sprayed with N,N-dimethyl- i-naphthylamine (DMNA)-acetic acid reagent, the separated components are converted to a diazo dye to produce red spots on an off-white background. The intensities of the spots are measured by visible reflectance and are related to concentration by calibration curves. The standard deviations obtained in the analysis of various synthetic mixtures and authentic samples are less than 0.2%. Identification of the impurities is accomplished by their R G values, measured relative to PETN.
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