Mechanism of the thermal decomposition of nitrates from graphite furnace mass spectrometry studies |
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Authors: | Boris V L'vov |
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Institution: | (1) Department of Analytical Chemistry, Leningrad State Technical University, SU-195251 Leningrad, USSR |
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Abstract: | A basically new mechanism of the thermal decomposition of solids is proposed to explain the mass spectral observations of gaseous molecules of CoO, CuO, Cu2O, NiO, PbO and Mg(OH)2 during the low-temperature decomposition of the anhydrous and hydrated nitrates of these metals. The mechanism consists of two stages: congruent gasification of all reaction products irrespective of their saturated vapor pressure and subsequent condensation of the low-volatility species (oxides and hydroxides). The partial pressures of these species at the appearance temperatures calculated from this theory for the first stage of the process (1–50 mPa) are in agreement with the detection limits of the quadrupole mass spectrometers used in these experiments. The proposed mechanism is supported by other available data obtained by thermal analysis. |
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Keywords: | electrothermal atomization mass spectrometry low-temperature gasification of nitrates decomposition mechanism solid-state reactions |
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