Total iodine in nutritional and biological reference materials using neutron activation analysis and inductively coupled plasma mass spectrometry |
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Authors: | Yves Gélinas G Venkatesh Iyengar and R M Barnes |
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Institution: | (1) Department of Chemistry, Lederle Graduate Research Center, University of Massachusetts, Box 34510, Amherst, MA 01003-4510, USA, US;(2) Biomineral Science International, 6202 Maiden Ln., Bethesda, MD 20817, USA, US |
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Abstract: | In a recent collaborative study intended to extend the variety of reference materials certified for iodine, three mineralization
methods were developed to quantify the total iodine content of biological and nutritional materials by inductively coupled
plasma mass spectrometry (ICP-MS). A mixture of water-soluble tertiary amines was used as the matrix solution for two oxygen
combustion methods and for a simple extraction at room temperature. Calibrations with matrix-matched standards, internal calibration,
and isotope dilution with 129I were used. Good agreement between neutron activation analysis (NAA) and the two combustion methods was observed except for
< 0.1 mg kg–1 iodine concentrations. The amine extraction method gave the most reliable results for the mixed diet, milk powder, and infant
formula samples but low recoveries for other biological materials owing to an incomplete extraction and solubilization of
iodine. The NAA method, with its freedom from reagent blank, is a useful technique for the independent determination of iodine
in biological, environmental and food matrices, especially for verification of iodine results obtained by ICP-MS.
Received: 11 February 1998 / Revised: 21 April 1998 / Accepted: 16 June 1998 |
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