Determinação de bromo e iodo em alga marinha comestível por ICP-MS após decomposição por combustão iniciada por micro-ondas

Mesko, Marcia Foster, Toralles, Isis Gonçalves, Crizel, Marcelo Guerreiro, Costa, Vanize Caldeira, Pires, Natanael Rodrigo Xavier, Pereira, Claudio Martin Pereira de, Picoloto, Rochele Sogari, Mello, Paola Azevedo

Determinação de bromo e iodo em alga marinha comestível por ICP-MS após decomposição por combustão iniciada por micro-ondas

AUTOR(ES)

Mesko, Marcia Foster, Toralles, Isis Gonçalves, Crizel, Marcelo Guerreiro, Costa, Vanize Caldeira, Pires, Natanael Rodrigo Xavier, Pereira, Claudio Martin Pereira de, Picoloto, Rochele Sogari, Mello, Paola Azevedo

FONTE

Quím. Nova

DATA DE PUBLICAÇÃO

2014-07

RESUMO

A method based on microwave-induced combustion (MIC) was applied for the decomposition of different types of edible seaweed (Nori, Hijiki and Wakame) for subsequent determination of bromine and iodine by inductively coupled plasma mass spectrometry (ICP-MS). Decomposition of 500 mg of each sample was achieved in less than 30 min. A single and diluted solution (150 mmol L-1 (NH4)2CO3) was used for the absorption of both analytes and a reflux step of 5 min was applied to improve analyte recoveries. Accuracy was evaluated using certified reference materials and agreement was between 103 and 108% for both elements.