Additivity of optical emissions applied to neodymium and praseodymium quantification in metallic didymium and (Nd,Pr)-Fe-B alloy samples by low-resolution atomic emission spectrometry
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2019
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Analytica Chimica Acta
Resumo
In this work, the effectiveness of a mathematical approach to solve the spectral interferences involved in
the optical emission of two chemical species (neodymium and praseodymium) when using monochromators
with low-resolution in atomic spectrometry is evaluated. Although recent technological
advances have promoted spectrometers equipped with high-resolution monochromators, which have a
great instrumental capability in the separation of nearby lines and consequently avoid spectral interferences,
many laboratories still have old spectrometers installed with insufficient resolution to overcome such interferences. In order to evaluate a mathematical approach based on Lambert-Beer's
Law, the optical emissions of neodymium and praseodymium were monitored on a low-resolution (200
pm) flame atomic emission spectrometry (F-AES). These two elements were strategically chosen as an
application model because they exhibit similar physicochemical properties, joint occurrence in nature
and because they are increasingly used in the manufacture of super-magnets, a material increasingly
required by the high technology industry. The effectiveness of the mathematical approach was evaluated
in three different ways: (i) by recovery of the analytes in synthetic mixtures containing known quantities
of the species; (ii) by spike and recovery trials on a representative blend of dissolved samples and (iii) by
comparing the results obtained with another analytical method: Inductively coupled plasma optical
emission spectrometry (ICP-OES) with a higher spectral resolution. The results indicate the effectiveness
of this simple mathematical approach, allow the “survival” of instruments equipped with low-resolution
monochromators and demonstrate the applicability of this approach to spectral correction. In addition,
this work contributes an analytical method for the quantification of neodymium and praseodymium in
metallic alloy samples involved in the production of super-magnets, aiding in the strict quality control of
these materials.
Como referenciar
PAPAI, RODRIGO; FREITAS, MILLENA A.S. de; FONSECA, KARINA T. da; ALMEIDA, GILMAR A. de; SILVEIRA, JOÃO R.F. da; SILVA, ANDRE L.N. da; FERREIRA NETO, JOÃO B.; SANTOS, CELIA A.L. dos; LANDGRAF, FERNANDO J.G.; LUZ, MACIEL S. Additivity of optical emissions applied to neodymium and praseodymium quantification in metallic didymium and (Nd,Pr)-Fe-B alloy samples by low-resolution atomic emission spectrometry: an evaluation of the mathematical approach used to solve spectral interferences. Analytica Chimica Acta, v. 1085, p. 21-28, 2019. DOI: 10.1016/j.aca.2019.07.049. Disponível em: http://repositorio.ipen.br/handle/123456789/30373. Acesso em: 29 Mar 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.