Startseite Departure from local thermal equilibrium during ICP-AES and FAES: Characterization in terms of collisional radiative recombination activation energy
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Departure from local thermal equilibrium during ICP-AES and FAES: Characterization in terms of collisional radiative recombination activation energy

  • Mark F. Zaranyika und Courtie Mahamadi
Veröffentlicht/Copyright: 10. Juli 2013
Pure and Applied Chemistry
Aus der Zeitschrift Pure and Applied Chemistry Band 85 Heft 12

Abstract

A simplified rate model is presented showing that when analytes are determined by atomic spectroscopy first in the absence, and then in the presence, of easily ionizable elements (EIEs) as interferents, the change in collisional radiative recombination activation energy, ∆Ea, is zero when the system conforms to local thermal equilibrium (LTE). ∆Ea values of –7.462, –7.925, and –8.898 eV were obtained when Ca(II), Mg(II), and Sr(II), respectively, were determined by inductively coupled plasma-atomic emission spectrometry (ICP‑AES) in the absence and presence of excess Li, while ∆Ea values of –6.477 and –7.481 eV were obtained when Mg(II) and Sr(II), respectively, were determined in the absence and presence of excess K as interferent. A value of –2.223 eV for ∆Ea was obtained when Mg(I) was determined by air-acetylene flame atomic emission spectrometry (FAES) in the absence and presence of excess K. The data confirm that all the systems studied were not in LTE, and suggest pre-LTE collisional radiative recombination in the absence of the interferent in all cases, and that collisional radiative recombination involving electrons from the interferent can occur from the ambipolar diffusion state or the LTE state. Possible causes for departure from LTE, and a possible collisional radiative recombination mechanism to account for the ∆Ea values obtained, are discussed.

: activation energy; calcium; easily ionizable elements; inductively coupled plasma-atomic emission spectrometry (ICP-AES); interference effects; lithium; local thermal equilibrium (LTE); magnesium; optical emission spectroscopy; plasma chemistry; plasma diagnostics; radiative recombination

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Published Online: 2013-07-10
Published in Print: 2013-12-01

© 2013 Walter de Gruyter GmbH, Berlin/Boston

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  1. Preface
  2. Polymeric sorbents for removal of Cr(VI) from environmental samples
  3. Effects of ZnO nanoparticles in alfalfa, tomato, and cucumber at the germination stage: Root development and X-ray absorption spectroscopy studies
  4. Source apportionment of polycyclic aromatic hydrocarbons in sediments from polluted rivers
  5. Near-infrared spectroscopy and chemometrics for rapid profiling of plant secondary metabolites
  6. Adsorption of radiocesium from aqueous solution using chemically modified pine cone powder
  7. Sustainable analytical chemistry—more than just being green
  8. Departure from local thermal equilibrium during ICP-AES and FAES: Characterization in terms of collisional radiative recombination activation energy
  9. Chemical speciation of environmentally significant metals with inorganic ligands. Part 5: The Zn2+ + OH-, Cl-, CO32-, SO42-, and PO43- systems (IUPAC Technical Report)
https://doi.org/10.1351/pac-con-12-11-03

Artikel in diesem Heft

  1. Preface
  2. Polymeric sorbents for removal of Cr(VI) from environmental samples
  3. Effects of ZnO nanoparticles in alfalfa, tomato, and cucumber at the germination stage: Root development and X-ray absorption spectroscopy studies
  4. Source apportionment of polycyclic aromatic hydrocarbons in sediments from polluted rivers
  5. Near-infrared spectroscopy and chemometrics for rapid profiling of plant secondary metabolites
  6. Adsorption of radiocesium from aqueous solution using chemically modified pine cone powder
  7. Sustainable analytical chemistry—more than just being green
  8. Departure from local thermal equilibrium during ICP-AES and FAES: Characterization in terms of collisional radiative recombination activation energy
  9. Chemical speciation of environmentally significant metals with inorganic ligands. Part 5: The Zn2+ + OH-, Cl-, CO32-, SO42-, and PO43- systems (IUPAC Technical Report)
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