Summary
A rapid and quantitative method for compound class characterization of coal-tar pitches without previous fractionation, using an improved TLC method with an FID system, has been developed. Results show adequate accuracy and precision, including the sampling step.
A fast calibration method, based on a variation of the internal normalization procedure, can be used for up to 18 μg of whole sample application, avoiding the usually tedious absolute calibration in such analyses. This range is more than sufficient in view of the small amounts usually spotted in this technique.
Speed of sample application by autospotter influences the shape of the peak nearest the point of application. For the coal tar pitch studied (9 wt.% non-eluted), slow application (0.5 μL min−1) gives a non-eluted Gaussianintegratable peak. A faster speed (10 μL min−1) is usable for analysing fossil products with lower non-eluted content. Total analysis time is less than 2 h, a considerably improvement on current methods.
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Cebolla, V.L., Vela, J., Membrado, L. et al. Coal-tar pitch characterization by thin-layer chromatography with flame ionization detection. Chromatographia 42, 295–299 (1996). https://doi.org/10.1007/BF02290312
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DOI: https://doi.org/10.1007/BF02290312