An Approach for Simultaneous Determination of Cyclohexanone Oxime and Hydroxylammonium Sulfate in the Hydrolysis of Cyclohexanone Oxime

Hydroxylammonium sulfate( HAS) and cyclohexanone oxime( CHO) are difficult to be separated in acidic media in the hydrolysis of CHO. Thus,it is difficult to determinate HAS accurately by redox titration method due to the interference of CHO. A simple and efficient approach for simultaneous determination of HAS and CHO in the hydrolysis reaction of CHO was successfully developed by combining redox titration and high performance liquid chromatography in this article. With the concentration of H+over 2. 4 mol / L and the molar ratio of Fe3 +to CHO over 5 ∶ 1,the relative standard deviation are 0. 39% and 0. 50%,and the correlation coefficients are 0. 99998 and 0. 99996 for five determinations of CHO and HAS,respectively. The recoveries of test samples are between 97. 1% and 100. 6%.