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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/17134

Title: Bromine, Chlorine, and Iodine Determination in Soybean and its Products by ICP-MS After Digestion Using Microwave-Induced Combustion
Other Titles: Food Analytical Methods
Authors: 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
Keywords: Soybean analysis;Microwave-induced combustion;Food analysis;Halogens;ICP-MS
Issue Date: 2013
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.
Description: Texto completo: acesso restrito. p.1065-1070
URI: http://repositorio.ufba.br/ri/handle/ri/17134
ISSN: 1936-9751
Appears in Collections:Artigos Publicados em Periódicos (Quimica)

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