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
| Autor: | Karina Torre da Fonseca, Fernando José Gomes Landgraf, Rodrigo Papai, Millena Aparecida Sousa de Freitas, Gilmar Alves de Almeida, João Batista Ferreira Neto, André Luiz Nunis da Silva, João Ricardo Filipini da Silveira, Celia Aparecida Lino dos Santos, Maciel Santos Luz |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Resolution (mass spectrometry)
Spectrometer Praseodymium 010401 analytical chemistry Analytical chemistry chemistry.chemical_element 02 engineering and technology Atomic spectroscopy 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry Neodymium Spectral line 0104 chemical sciences Analytical Chemistry Chemical species chemistry Environmental Chemistry Inductively coupled plasma 0210 nano-technology Spectroscopy |
| Zdroj: | Analytica chimica acta. 1085 |
| ISSN: | 1873-4324 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect