Reduction of metal oxides by carbon in graphite furnaces. Part 2. Temporal oscillations in atomic absorption during the process of slow evaporation of Al, Mn and Yb oxides in spatially isothermal and non-isothermal graphite atomizers

Download
  1. (PDF, 349 KB)
  2. Get@NRC: Reduction of metal oxides by carbon in graphite furnaces. Part 2. Temporal oscillations in atomic absorption during the process of slow evaporation of Al, Mn and Yb oxides in spatially isothermal and non-isothermal graphite atomizers (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1039/a906642j
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleJournal of Analytical Atomic Spectrometry
ISSN0267-9477
Volume15
Issue2
Pages115120; # of pages: 6
AbstractTemporal oscillations in the kinetics of carbothermal reduction of Al, Mn and Yb oxides in spatially isothermal side-heated tubes were investigated in the first part of this study. Microgram amounts of the elements, as their nitrates, were evaporated during slow heating (1–20 K s−1) of the graphite tube. Several features of this phenomenon were investigated, including the effects of sample mass and solution volume, the influence of Sr and the type (Ar and N2) and flow rate (0–250 ml min−1) of sheath gas on the character of the atomic absorption spikes. Essentially, all effects were similar to those found with spatially non-isothermal tubes. Results of possible effects of condensation/re-evaporation processes on temporal oscillations of atomic absorption signals from Al and Yb oxides in spatially non-isothermal tubes are presented in the second part of this study. No influence of transport processes on the temporal oscillations during common conditions of sampling and heating was evident. The results suggest that the origin of the temporal oscillations lies with the primary sample residue. All the above support the gaseous carbide mechanism of formation of temporal oscillations in the atomic absorption signals.
Publication date
LanguageEnglish
AffiliationNRC Institute for National Measurement Standards; National Research Council Canada
Peer reviewedNo
Identifier10391186
NRC number138
NPARC number8898659
Export citationExport as RIS
Report a correctionReport a correction
Record identifierfa9343a4-e984-4aaf-8187-e7f14ccec06e
Record created2009-04-22
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)