Abstract
The atomization interference effects of AlCl3 on MgCl2 and CaCl2 during flame atomic absorption spectrometry were studied in terms of a steady state kinetic model which takes into account relative rates of thermal dissociation of analyte and interferant metal salts, recombination of counter atom and analyte and interferant atoms, charge transfer between analyte and interferant species, and ion/electron collisional de-ionization within the plasma. Data are presented showing that the interference of AlCl3 on the atomization of MgCl2 and CaCl2 in an air-acetylene flame is due (a) to interference effects due to AlCl3 which occur prior to complete atomization of the Group II metal chlorides, and (b) to the recombination of the Group II metal and the chlorine atom which is enhanced by the increased density of the chlorine atom as a result of the dissociation of the AlCl3 interferant.
Published Version
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