| Revue: | Ecletica quimica |
| Base de datos: | |
| Número de sistema: | 000552492 |
| ISSN: | 0100-4670 |
| Autores: | Lisboa, Thalles Pedrosa1 de Oliveira, Marcone Augusto Leal1 Lemos, Luiza Conforte da Silva1 Calzavara, Fillipe Caitano1 Barbosa, Beatriz Silva1 Baia, Gabriela Ezura1 de Farias, Davi Marques1 de Faria, Lucas Vinicius1 Matos, Maria Auxiliadora Costa1 da Silva, Júlio César José1 |
| Instituciones: | 1Federal University of Juiz de Fora, Institute of Exact Sciences, Juiz de Fora, Brazil., |
| Año: | 2021 |
| Volumen: | 46 |
| Número: | 3 |
| Paginación: | 33-41 |
| País: | Brasil |
| Idioma: | Inglés |
| Resumen en inglés | Ultrasound-assisted extraction and direct analysis were compared with total digestion for magnesium determination in beer samples by flame atomic absorption spectrometry. The method for total digestion used concentrated nitric acid under plate heating. In optimized instrumental conditions, validation of the analytical method was promoted, with good linear range (0.06 to 0.5 mg L–1), low limits of detection and quantification (0.04 and 0.12 µg g–1, respectively), good precision, relative standard deviation (RSD) < 3.4%, and accuracy (recovery levels of 91.5 to 99.0%). The characteristic concentration (C0) was 9 µg L–1. The extraction procedure was performed in a 1:1 nitric acid solution for 55 min in an ultrasonic bath at 60 °C, while the direct analysis involved a dilution of the samples in a 2% v/v nitric acid solution. The different sample preparation methods were applied to 13 beer samples and at a 95% confidence level, no significant differences were observed. Thus, direct analysis proved to be more suitable for quality control routines of beer samples in the industry. |
| Texte intégral: | Texto completo (Ver PDF) |
