Atomic and molecular spectra of vapours evolved in a graphite furnace. Part 2: magnesium chloride

G. Daminelli, D. A. Katskov, R. M. Mofolo, T. Kántor

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Abstract

Electrothermal atomic and molecular absorption spectrometry was applied to investigate the vaporization of magnesium chloride. Using a CCD linear array detector, atomic and molecular absorption spectra were simultaneously measured in the range 200-400 nm. Vaporization was performed from pyrocoated and tantalum-lined graphite tubes; Ar and He were employed as furnace gas. A broad molecular band was first observed at 210 nm and attributed to MgCl2(g). The signal was followed by a partially resolved system at 266, 269, 273 nm and a three bands at 369, 376 and 382 nm, which are characteristic of MgCl(g). The release of MgCl vapours was accompanied by Mg atomic absorption and by light scattering. MgCl2·6H2O partially vaporizes as MgCl2(g) and partially reacts with the water of crystallization (hydrolysis reaction), leading to a mixture of magnesium hydroxychloride and hydroxide. By further heating of the condensed phase MgO(s) and MgCl vapours are formed. The hydrolysis process was favoured by long pyrolysis treatments or by stopping the gas flow during the pyrolysis step. In He atmosphere or when a tantalum-lined tube was used, the fraction of salt vaporized as MgCl2 was increased, while scattering effects were not observed.

Original languageEnglish
Pages (from-to)683-697
Number of pages15
JournalSpectrochimica Acta - Part B Atomic Spectroscopy
Volume54
Issue number5
DOIs
Publication statusPublished - May 10 1999

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magnesium chlorides
atomic spectra
molecular spectra
Magnesium Chloride
Graphite
Tantalum
Vaporization
furnaces
Magnesium
Hydrolysis
Furnaces
Pyrolysis
graphite
Vapors
Gas furnaces
vapors
molecular absorption
tantalum
Charge coupled devices
Light scattering

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy

Cite this

Atomic and molecular spectra of vapours evolved in a graphite furnace. Part 2 : magnesium chloride. / Daminelli, G.; Katskov, D. A.; Mofolo, R. M.; Kántor, T.

In: Spectrochimica Acta - Part B Atomic Spectroscopy, Vol. 54, No. 5, 10.05.1999, p. 683-697.

Research output: Contribution to journalArticle

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