Simultaneous determination of the component ratio and moisture content in TEGDN/NG composites by the qNMR method

Abstract

A novel qNMR method was developed for the simultaneous determination of the component ratio and moisture content in triethyleneglycol dinitrate (TEGDN) and nitroglycerin (NG) composites. Using the ERETIC module technique of NMR spectrometry, moisture in the solvent and internal standard were eliminated by the integral value subtraction method, and the component ratio and moisture content in TEGDN/NG composites could be accurately calculated. Method validation was carried out in terms of the precision, stability, linearity, recovery, robustness, limit of quantification (LOQ) and limit of detection (LOD). The results of the qNMR method show good accuracy compared with the HPLC and Karl Fischer methods. Statistical Student's t-test and F-test at the 95% confidence level proved that there was no significant difference between the qNMR method and the other two methods. For TEGDN/NG composites of high-energy and high-sensitivity explosives, the low dose and high efficiency of the qNMR method could effectively avoid the danger of explosion and burning.