1982 Volume 31 Issue 9 Pages 498-503
It is known that a mixture of phenols dissolved in a solvent containing a small amount of a metallic salt give well resolved signals for OH protons of each component. In order to determine the amount of each phenol in the mixture using this phenomenon, chemical shifts of OH protons of phenols were measured in acetone, ether, and ethyl acetate. This technique was applied to the determination of each mixture of nitrophenols, polyhydric phenols, or hydroxy benzoic acids, which was difficult to be determined by other methods, by using Cd(NO3)2 as a metallic salt. The analytical conditions for these phenols were as follows: the quantity of Cd(NO3)2 dissolved in a solvent was adjusted to 50 ppm;the appropriate solvent was acetone for nitrophenols and hydroxy benzoic acids and ether for polyhydric phenols;the optimum concentration of phenols was 5 mol% for nitrophenols, 3 mol% for polyhydric phenols and 1 mol% for hydroxy benzoic acids. Calibration curves constructed from the peak height or the area of signals for OH protons v.s. concentration were linear. The relative error was within 3 %. This method is considered to be useful as the easy and rapid analysis of various types of phenols.
