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Urea Nitrate (urea + nitrate)
Selected AbstractsDetermination of Urea Nitrate and Guanidine Nitrate Vapor Pressures by Isothermal ThermogravimetryPROPELLANTS, EXPLOSIVES, PYROTECHNICS, Issue 3 2010Jimmie Oxley Abstract Since the bombing of Pan Am Flight 103 over Lockerbie, Scotland in 1988, detection of military explosives has received much attention. Only in the last few years has detection of improvised explosives become a priority. Many detection methods require that the particulate or vapor be available. Elsewhere we have reported the vapor pressures of peroxide explosives triacetone triperoxide (TATP), diacetone diperoxide (DADP), and 2,4,6-trinitrotoluene (TNT). Herein we examine the vapor signatures of the nitrate salts of urea and guanidine (UN and GN, respectively), and compare them to ammonium nitrate (AN) and TATP using an isothermal thermo-gravimetric method. The vapor signatures of the nitrate salts are assumed to be the vapor pressures of the neutral parent base and nitric acid. Studies were performed at elevated temperatures (80,120,°C for UN, 205,225,°C for GN, 100,160,°C for AN, and 40,59,°C for TATP), enthalpies of sublimation calculated and vapor pressures extrapolated to room temperature. Reported vapor pressure values (in Pa) are as follows: GN ,,UN , ChemInform Abstract: Metal-Free Oxidation of Urazole and 1,4-Dihydropyridine Derivatives under Mild and Heterogeneous Conditions by Nitro Urea, Derived from Urea Nitrate, and Silica Sulfuric Acid.CHEMINFORM, Issue 40 2010Arash Ghorbani-Choghamarani Abstract Advantages of the title procedure are the non-toxic and mild conditions and the easy and clean work-up of the products. [source] Characterization of the improvised explosive urea nitrate using electrospray ionization and atmospheric pressure chemical ionizationRAPID COMMUNICATIONS IN MASS SPECTROMETRY, Issue 14 2005Tsippy Tamiri Mass spectra of urea nitrate were measured in electrospray ionization and in atmospheric pressure chemical ionization in the negative mode. In both ionization methods two characteristic adduct ions containing the intact molecule [urea nitrate+NO3], and [urea nitrate+HNO3+NO3], are shown. The structure of the two adduct ions was deduced using measurements of isotopically labeled urea nitrate. Collision-induced dissociation measurements of the adduct ions show typical losses enabling the identification of urea nitrate in trace amounts. Using these methods urea nitrate was identified in real cases. Copyright © 2005 John Wiley & Sons, Ltd. [source]
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