Halogenation with CCl4 and CF2Cl2 vapours in arc emission spectrometry

T. Kántor, É Hanák-Juhai, E. Pungor

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Halocarbon vapour diluted with air or nitrogen was applied during the arc excitation of carbide forming elements in solution form, of metal samples (copper, aluminium) and powder samples (alumina, glass, RU-powder) on graphite supporting electrodes. Means were developed for the carrier vaporization of CCl4 and for the introduction of the halocarbon vapour into the arc discharge. The gaseous agent was supplied continuously during excitation. This possibility was also subjected to some theoretical predictions. On applying CCl4 with samples introduced in solution form, the volatilization rates of the most refractory elements (e.g. W) were found to increase at least 50 times on the basis of line intensities. Fractional distillation could be attained on constituents and matrices similar to those reported with solid agents, but the gaseous agents could be applied more easily and without contamination problems. The overall effect of halogenation on excitation processes was evaluated from line intensities integrated over the total evaporation time of a complex powder sample, with and without graphite powder dilution. A high intensification (a factor of 3-12) was obtained for the u.v. lines of the refractory constituents with halogenation, which was attributed to the increased efficiency of these elements in entering the excitation zone. Decrease in the intensities of barium atom and ion lines in the VIS range and a decrease of self-absorption were found as a consequence of halide formation in the arc fringe.

Original languageEnglish
Pages (from-to)401-420
Number of pages20
JournalSpectrochimica Acta - Part B Atomic Spectroscopy
Volume35
Issue number7
DOIs
Publication statusPublished - 1980

Fingerprint

Halogenation
halogenation
Powders
Spectrometry
arcs
Vapors
Halocarbons
vapors
halocarbons
refractories
Vaporization
Refractory materials
spectroscopy
excitation
graphite
Graphite electrodes
vaporizing
self absorption
Graphite
Aluminum Oxide

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy

Cite this

Halogenation with CCl4 and CF2Cl2 vapours in arc emission spectrometry. / Kántor, T.; Hanák-Juhai, É; Pungor, E.

In: Spectrochimica Acta - Part B Atomic Spectroscopy, Vol. 35, No. 7, 1980, p. 401-420.

Research output: Contribution to journalArticle

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