A spectrophotometric procedure employing measurements in both the ultraviolet and infrared regions was developed to determine the concentrations of N-butyl acetanilide, benzyl benzoate, 2-ethyl, 2-butyl propanediol-1,3 and Tween 80, in a mixture containing only these four components.
The first two components have relatively strong absorptivities in the ultraviolet at 227.5 and 280.3 millimicrons, while the latter two have absorption bands at the infrared wavelengths, 8.99 and 9.60 microns. By substituting the absorptivities at these wavelengths in a set of four simultaneous equations, the percentage of each component in an insect repellent mixture is calculated.
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References
1.
Beroza, Morton, Anal. Chem.25, 112, (1953).
2.
Private communication, Orlando Florida Laboratories, U. S. Dept. of Agriculture, Bureau of Entomology and Plant Quarantine.
