https://repositorio.ufba.br/handle/ri/17134
Tipo: | Artigo de Periódico |
Título: | Bromine, Chlorine, and Iodine determination in soybean and its products by ICP-MS After Digestion Using Microwave-Induced Combustion |
Título(s) alternativo(s): | Food Analytical Methods |
Autor(es): | Barbosa, José Tiago Pereira Santos, Clarissa Marques Moreira Bispo, Lilia dos Santos Lyra, Fernanda Henrique David, Jorge Mauricio Korn, Maria das Graças Andrade Flores, Erico Marlon Moraes |
Autor(es): | Barbosa, José Tiago Pereira Santos, Clarissa Marques Moreira Bispo, Lilia dos Santos Lyra, Fernanda Henrique David, Jorge Mauricio Korn, Maria das Graças Andrade Flores, Erico Marlon Moraes |
Abstract: | A method for bromine, chlorine, and iodine determination in soybean and related products was developed by inductively coupled plasma mass spectrometry (ICP-MS) after digestion by microwave-induced combustion (MIC). Samples were pressed as pellets and combusted using pressurized oxygen (20 bar) and ammonium nitrate solution (50 μL of 6 mol L−1) as the igniter. Analytes were absorbed in alkaline solution (100 mmol L−1 NH4OH), and a reflux step of 5 min, microwave power of 1,400 W, was applied after combustion in order to improve analyte recoveries. For Cl determination by ICP-MS, a dynamic reaction cell was used with ammonia as the reaction gas. The accuracy was evaluated using certified reference materials (CRMs) and spiked samples. Using MIC, the agreement with CRM values and spike recoveries was higher than 95 % for all analytes for certified reference materials of a similar composition (National Institute of Standards and Technology (NIST), corn bran and NIST, whole milk). Limits of detection were 0.03, 1.2, and 0.002 μg g−1 for Br, Cl, and I, respectively. The residual carbon content in the digests obtained after MIC procedure was lower than 0.5 %. Blanks were always negligible and no memory effects were observed. Digestion by MIC allowed processing up to eight samples by each run in 25 min with high efficiency of digestion providing a suitable medium for further bromine, chlorine, and iodine determination by ICP-MS. |
Palavras-chave: | Soybean analysis Microwave-induced combustion Food analysis Halogens ICP-MS |
Tipo de Acesso: | Acesso Aberto |
URI: | http://repositorio.ufba.br/ri/handle/ri/17134 |
Data do documento: | 2013 |
Aparece nas coleções: | Artigo Publicado em Periódico (Química) |
Arquivo | Descrição | Tamanho | Formato | |
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José Tiago Pereira Barbosa.pdf | 149,89 kB | Adobe PDF | Visualizar/Abrir |
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