1,2,4-Triazole as a reference material for combustion calorimetry of N-containing compounds |
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| Institution: | 1. College of Physical and Electronics Engineering, Sichuan Normal University, Chengdu, China;2. College of Optoelectronic Technology, Chengdu University of Information Technology, Chengdu 610225, China;1. Departamento de Química, Universidad de Córdoba, Montería, Colombia;2. Departamento de Química, Universidad Nacional de Colombia, Bogotá, Colombia;1. Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, B?ehová 7, Prague 1, Czech Republic;2. Academy of Sciences of the Czech Republic, Institute of Physics, Cukrovarnická 10, Prague 6, Czech Republic |
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| Abstract: | A micro-bomb combustion calorimeter recently designed for samples of mass ≈ 80 mg has been improved and tested with m -methoxybenzoic acid in order to verify the chemistry of the combustion process and the accuracy of the energy corrections involved in the analysis of results. From measurements in this calorimeter, the standard massic energy of combustion of 1,2,4-triazole was determined to beΔcuo = ? (19200.3 ± 3.4)J · g ? 1. Some new measurements with our macro combustion calorimeter confirm an earlier result from this laboratory of ? (19203.1 ± 1.2)J · g ? 1. Determination of the purity by d.s.c. of 1,2,4-triazole purified some 10 years ago reveals that samples of this compound remained unchanged and suggest that 1,2,4-triazole be used as a possible reference material for organic compounds with a high content of nitrogen. From the experimental results with the micro-bomb combustion calorimeter, the actual and earlier results from macro-bomb combustion calorimetry, and those obtained in other laboratories, the standard massic energy of combustion of 1,2,4-triazole was deduced to beΔcuo = ? (19202.5 ± 1.7)J · g ? 1. |
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