AVALIAÇÃO DE MÉTODOS DE SOLUBILIZAÇÃO PARA DETERMINAÇÃO DE METAIS EM GLICERINA PROVENIENTE DA PRODUÇÃO DE BIODIESEL POR TÉCNICAS DE ESPECTROMETRIA ATÔMICA
AUTOR(ES)
Clasen, Caroline D, Lisboa, Meibel T., Pinto, Ane Martiele T. P., Ribeiro, Anderson S., Vieira, Mariana A.
FONTE
Quím. Nova
DATA DE PUBLICAÇÃO
2015-01
RESUMO
This paper describes the evaluation of simple and fast solubilization methods for the determination of Ca, Mg, and K in glycerin samples from biodiesel production by atomic spectrometry. The solubilization in water was compared with two other methods: solubilization in formic acid and solubilization in ethanol. Using solubilization in water, determination of the three analytes was possible; the values of limits of detection for Ca, K, Mg were 0.31, 0.06, and 0.16 mg kg−1, respectively. Because no adequate reference material was available, the accuracy was evaluated by assessing the recoveries tests with both solubilization methods; the evaluation ranged from 90% to 115%, with values of relative standard deviation >8%, indicating good accuracy of the measure. Four crude glycerin samples obtained from biodiesel plants of Rio Grande do Sul were analyzed after treatment with the different methods of solubilization, and the obtained results of Ca, Mg, and K concentration were in agreement with the values obtained from both solubilization methods. Therefore, solubilization in water is concluded to be a simpler, faster, and viable method for sample preparation of glycerin.
Documentos Relacionados
- Estudo comparativo de métodos de preparo de amostras de tinta para a determinação de metais e metalóides por técnicas de espectrometria atômica
- Desenvolvimento de métodos analíticos para a determinação de lantanídeos por técnicas de espectrometria atômica com plasma indutivamente acoplado
- DETERMINAÇÃO DE METAIS POR TÉCNICAS DE ESPECTROMETRIA ATÔMICA EM AMOSTRAS DE CARVÃO MINERAL E CINZAS UTILIZANDO METODOLOGIA DE SUPERFÍCIE DE RESPOSTA
- Avaliação de tratamentos da amostra em microescala para a determinação de K, Mg, Na e Zn em carnes por técnicas de espectrometria atômica
- EVALUATION OF METHODS FOR THE DETERMINATION OF TRACE ELEMENTS IN BIODIESEL BY ATOMIC SPECTROMETRY