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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

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Autor(es):
Papai, Rodrigo [1] ; Sousa de Freitas, Millena Aparecida [1] ; da Fonseca, Karina Torre [1] ; de Almeida, Gilmar Alves [1, 2] ; Filipini da Silveira, Joao Ricardo [1] ; Nunis da Silva, Andre Luiz [1] ; Ferreira Neto, Joao Batista [1] ; Lino dos Santos, Celia Aparecida [1] ; Gomes Landgraf, Fernando Jose [3] ; Luz, Maciel Santos [1]
Número total de Autores: 10
Afiliação do(s) autor(es):
[1] Inst Pesquisas Tecnol Estado Sao Paulo IPT, Ave Prof Almeida Prado 532, Predio 02, Cidade Univ, BR-05508901 Sao Paulo, SP - Brazil
[2] Inst Pesquisas Energet & Nucl, Ave Prof Lineu Prestes, 2242, Cidade Univ, BR-05508000 Sao Paulo, SP - Brazil
[3] Escola Politecn Univ Sao Paulo, Ave Prof Luciano Gualberto 380, Cidade Univ, BR-05508010 Sao Paulo, SP - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Analytica Chimica Acta; v. 1085, p. 21-28, NOV 28 2019.
Citações Web of Science: 0
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. (C) 2019 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 14/50887-4 - INCT 2014: PATRIA Processamento e Aplicação de Ímãs de Terras Raras para Indústria de Alta Tecnologia
Beneficiário:Fernando Jose Gomes Landgraf
Linha de fomento: Auxílio à Pesquisa - Temático