Determination of bromine and iodine in shrimp and its parts by ICP-MS after decomposition using microwave-induced combustion

A digestion method based on microwave-induced combustion (MIC) was developed for bromine and iodine determination in shrimp and its parts (shells and head, and tissue) by inductively coupled plasma mass spectrometry (ICP-MS). Ammonium nitrate solution was used as an igniter for combustion and vessel...

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Bibliographic Details
Published in:Analytical methods 2014-01, Vol.6 (18), p.7540-7546
Main Authors: Hartwig, Carla Andrade, Toralles, Isis Gonçalves, Crizel, Marcelo Guerreiro, Hermes Muller, Aline Lima, Picoloto, Rochele Sogari, Moraes Flores, Erico Marlon, Mesko, Marcia Foster
Format: Article
Language:English
Subjects:
Absorption
Bromine
Combustion
Digestion
Extraction
Iodine
Shells
Shrimps
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Summary:A digestion method based on microwave-induced combustion (MIC) was developed for bromine and iodine determination in shrimp and its parts (shells and head, and tissue) by inductively coupled plasma mass spectrometry (ICP-MS). Ammonium nitrate solution was used as an igniter for combustion and vessels were pressurized with O sub(2) at 20 bar. Solutions of (NH sub(4)) sub(2)CO sub(3) (50 or 100 mmol L super(-1)) and NH sub(4)OH (25, 50, 75 or 100 mmol L super(-1)) were evaluated as absorbing media for Br and I. Better results were obtained for Br and I determination using 50 mmol L super(-1) NH sub(4)OH as absorbing medium. Using this solution, blanks were always negligible and memory effects were virtually absent. The accuracy of the proposed MIC method was evaluated using a reference material (NIST 8414) with agreement better than 99% for both analytes. The limits of detection by MIC and further ICP-MS determination (Br: 0.12 mu g g super(-1); I: 0.001 mu g g super(-1)) were better than those obtained when the extraction procedure was used. Additionally, a microwave-assisted alkaline extraction method was also evaluated using 0.11 mol L super(-1) TMAH as extractant solution. However, alkaline extraction was only feasible for shrimp tissue and not for whole shrimp or shells. Decomposition using MIC allowed the determination of Br and I by ICP-MS in shrimp and the respective distribution of these elements in shells and head, and in tissue avoiding the use of concentrated digestion or extraction solutions.
ISSN:1759-9660
1759-9679
DOI:10.1039/C4AY00974F