Abstract
Abstract The well-known reaction between methyl salicylate and ferric chloride has been successfully applied to the quantitative estimation of methyl salicylate in medicated oils. An aqueous solution of ferric chloride is added to an ether solution of medicated oil dissolved in excess water. After filtering, the absorbance of the filtrate is measured at 530 m/j, and the content of methyl salicylate is determined from a calibration curve. Methyl salicylate recoveries range from 92 to 97% for concentrations between 10 and 60% in a synthetic mixture. The method is simple and rapid, and compares favorably with Wilson’s method.
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