Determination of ascaridol in chenopodium oil was made by the infrared absorption spectrum. The wave-length of 10.69μ was chosen as the key band, and in the thickness of cell at 0.1mm., and in concentrations below approximately 8% by weight, the Beer's law was found to be applicable. Quantitative analyses with various samples could be made rapidly within an approximate error of 1-2%. This method could be used as a means of examining the method of chemical determination.
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