Abstract
IN a recent communication, Friedel1 compared the specific extinction coefficients of coal at two wave-lengths with those of various polynuclear aromatics and found the values for coal (a Pittsburgh vitrain containing 84 per cent carbon) 30–40 times lower than those for the model substances. From these data Friedel concluded that the concentration of polynuclear condensed aromatics in coal is low.
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References
Friedel, R. A., Nature, 179, 1237 (1957).
van Krevelen, D. W., Schuyer, J., “Coal Science”, 164 (Elsevier, Amsterdam, 1957).
van Krevelen, D. W., and Schuyer, J., “Coal Science”, 176 (Elsevier, Amsterdam, 1957).
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VAN KREVELEN, D., GROENEWEGE, M. & RIETVELD, B. Polynuclear Aromatic Compounds in Coal. Nature 181, 640–641 (1958). https://doi.org/10.1038/181640a0
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DOI: https://doi.org/10.1038/181640a0
