Furnace atomization plasma emission spectrometry with He/Ar mixed gas plasmas

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DOIResolve DOI: http://doi.org/10.1016/S0584-8547(99)00149-4
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TypeArticle
Journal titleSpectrochimica Acta. Part B, Atomic Spectroscopy
ISSN05848547
Volume54
IssueDecember 31 14
Pages21212141; # of pages: 21
SubjectFAPES; He; Ar; Mixed gas plasmas; Figures of merit
AbstractThe influence of plasma gas composition on the operating and analytical characteristics of a furnace atomization plasma emission source (FAPES) is presented. He I and Ar I excitation temperatures increase 30% in the mixed gas plasmas whereas argon ion excitation temperatures decrease from 33 000 K to 26 000 K in the presence of He. Collisional exchange of internal energy between excited states of Ar and He accounts for these changes. Average analyte ionization temperatures (for Cr, Mn, Mg, Co, Fe, Cd and Zn), derived from the relative emission intensities of their ionic and atomic lines in a 40-MHz 50-W plasma, increase from 5270 K to 6740 K with the addition of Ar to He. Ionic line intensities increase from 10-fold (Mn) to 40-fold (Cd, Zn) with addition of Ar to the plasma while atomic line intensities increase only twofold. Limits of detection remain substantially unaltered for atomic transitions due to increased noise but are improved twofold (Cd) to 24-fold (Mn) for ionic transitions. The analytical advantages and disadvantages of mixed gas plasmas are discussed. The Ne I excitation temperature at 40 MHz and 50 W was determined to be 4330±80 K.
Publication date
LanguageEnglish
AffiliationNRC Institute for National Measurement Standards; National Research Council Canada
Peer reviewedNo
Identifier10274169
NRC number194
NPARC number5765353
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Record identifier1410b297-48b1-43bc-bf88-fd07b94d9ae3
Record created2009-03-29
Record modified2016-05-09
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