NDLI: Boron, calcium and silicon in an arc plasma in air with chlorine: calculation of the plasma composition

Content Provider	Royal Society of Chemistry (RSC)
Author	Radić-Perić, Jelena
Copyright Year	1992
Abstract	The composition of an air plasma in the presence of chlorine (0.1%), and boron, calcium or silicon (at concentrations in the plasma of 0.0001%), was calculated assuming thermal equilibrium, in the temperature range 298–6000 K. The calculated plasma composition reproduces the composition of the d.c. arc plasma free burning in air, as the plasma is assumed to be in (local) thermal equilibrium. Assuming that an arc is usually operated between graphite electrodes, the presence of carbon in the plasma (1%) was also taken into account. It was found that the presence of chlorine in the plasma caused a decrease in the atomic, ionic and molecular forms of calcium, boron and silicon and their spectral line and band intensities (compared with observations in the absence of chlorine) only at temperatures <3000 K. The presence of carbon in the plasma (under the conditions investigated) had almost no influence on the partial pressures of calcium, boron and silicon species and on the partial pressures of compounds of chlorine with oxygen and nitrogen. Also, the change in partial pressures of CN, C2etc.(the radiation of these molecules produces the background band spectra in the graphite arc), in the presence of chlorine, cannot be observed.
Starting Page	235
Ending Page	238
Page Count	4
File Format	PDF
ISSN	02679477
Volume Number	7
Issue Number	2
Journal	Journal of Analytical Atomic Spectrometry
DOI	10.1039/JA9920700235
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Blood plasma Chlorine Boron Calcium Thermodynamic equilibrium Graphite Carbon Oxygen Nitrogen
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Analytical Chemistry

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