Acid Decomposition of Yerba Mate (Ilex paraguariensis) Using a Reflux System for the Evaluation of Al, Ca, Cd, Cr, Cu, Fe, K, Mg, Mn, Na, Pb and Zn Contents by Atomic Spectrometric Techniques

Journal of the Brazilian Chemical Society

Cidade, Mirla J. A.¹  Pereira, Camila C.¹  Universidade Estadual de Campinas, Campinas, Brazil¹  Universidade Federal de Roraima, Boa Vista, Brazil¹  Vieira, Mariana A.¹  Oreste, Eliézer Q.¹  Ribeiro, Anderson S.¹  Souza, Alexander O.¹  Universidade Federal de Pelotas, Capão do Leão, Brazil¹  Cadore, Solange¹ 

关键词:  acid decomposition;    reflux system;    yerba mate;    spectrometric techniques;   

DOI  :  10.5935/0103-5053.20150317

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

In the first part of this paper, two acid decomposition procedures for the determination of Al, Ca, Fe, Mg, Mn and Zn contents in yerba mate samples by inductively coupled plasma optical emission spectrometry (ICP OES) were compared. Using a reflux system, the samples were treated with a mixture of HNO3 and H2O2 for 3 hours at 220 °C in the digester block. The results from five commercial yerba mate samples were compared with the results obtained from microwave digestion. Good agreement between the procedures at a 95% confidence level was obtained with relative standard deviation (RSD) values lower than 10.0%. The accuracy was evaluated using addition and recovery experiments (80.5 to 112.8%). In the second part, Ca, Cd, Cr, Cu, Fe, K, Mg, Na, Pb and Zn concentrations were evaluated in the yerba mate infusion. The results showed that elements such as Na, K, Mg and Zn are easily transferred to the hot water used for the infusion. For Pb and Cd, the concentrations found in the analyzed samples were lower than the values established by Brazilian legislation.

【 授权许可】

Unknown