Central European Journal of Energetic Materials Volume 10, Number 1, 2013

Assay of the Insensitive High Explosive 3-Nitro-1,2,4-
triazol-5-one (NTO) by Acid-Base Titration

Amiya Kumar NANDI, Sunil Kumar SINGH,
Ganesh Murlidhar KUNJIR, Jaivindra SINGH,
Alok Kumar MANDAL and Raj Kishore PANDEY

High Energy Materials Research Laboratory, Chemical Engineering and Pilot Plant Division, Sutarwadi, Pune-411021, India 

Abstract: The insensitive high explosive 3-nitro-1,2,4-triazol-5-one (NTO) is a weak acid (pKa 3.76) due to the labile N–H bond. The weakly acidic character of this compound is exploited for its assay by aqueous acid-base titration. The NTO sample was dissolved in water and the resultant solution was titrated against 0.07 N NaOH solution using phenolphthalein as indicator. Regular batch samples were assayed by this method and the results were compared with those obtained by the HPLC method. The aqueous acid-base titration method was found to be suitable for the quality control of the product. 

Keywords: NTO, purity, acid-base titration, HPLC, quality control

Institute of Industrial Organic Chemistry

Warsaw, Poland