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Quantitative Infra-Red Analysis of Mixtures

Abstract

DIFFERENTIAL analysis of mixtures is an accepted technique in ultra-violet spectrophotometry1, and it is the purpose of this communication to describe the successful application of this technique to infra-red solution analysis, where a double-beam instrument is used. Double-beam infra-red spectrophotometers enable complex mixtures of isomeric or closely related substances to be analysed; but it is usually necessary to detect a major peak peculiar to a particular component of the mixture. This is not always possible, and minor peaks, or peaks where interference is present, have been used. In the latter case corrections are applied for the interfering substance, which is separately estimated. Interference can also affect the shoulders adjacent to an analytical peak, so, while the actual peak is unaffected, the resultant extinction coefficient is questionable, because the true base line (I 0 value) is in doubt.

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References

  1. Beroza, M., Anal. Chem., 25, 112 (1953).

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McDONALD, I. Quantitative Infra-Red Analysis of Mixtures. Nature 174, 703–704 (1954). https://doi.org/10.1038/174703b0

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