V O L U M E 2 8 , NO. 6, J U N E 1 9 5 6 (8) Feldinan, C.. A h ' ~ r , .C H E M . 21, 1041 (1949). (9) Garnbrill, (1. 11.. Garsniann, A. G., O'?;eill. IT. R., Ibid., 23, 1365 (1951). (10) Gerlach, IT., Huthardt, K., Siebert Festschr. 1931, 51. (11) Gerlach, W., Schweitzer, E., Z . anorg. Chem. 181, 103 (1929). (12) Rouir, E. V., J-aiihokestal, A . J I , , Spectrochim. Acta 4, 330 (1953).
993 (13) Ruthardt. I- 4. 19.56.
Determination of Pyridines by Infrared Spectroscopy G. L. COOK
and F.
M. CHURCH
Petroleum and O i l - S h a l e Experiment Station, Bureau o f Mines, Laramie, W y o .
4 procedure for analysing mixtures of p?ridines by infrared spectroscopy is applicable to distillation fractions, each of which contains only a few individual homologs. Commercially ai ailable standards limit use of the procedure to fractions boiling below about 185' C. Reliability is illustrated by results on two known blends of pyridines. 4ierage deviation from known ialues for a blend in the methylpjridine range was 0 . 2 7 ~ and for a blend in the dimethylpjridine range was 29'~. On applying the method to the analjais of low-boiling tar bases extracted from an oil produced by retorting Colorado oil shale, 11 p? ridines were identified and concentrations of nine were quantitatively estimated.
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