| Analysis of foods for iodine: interlaboratory study. | |
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MedLine Citation:
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PMID: 528445 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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An accurate, reproducible method for less than or equal to 1 ppm iodine in foods is required for nutritional labeling. In order to ascertain the current status of iodine analysis in foods, 7 samples, representing different food classes, were analyzed by 8 laboratories. Six laboratories used their modifications of the Ce-As-I catalytic method preceded by alkaline dry ashing. Two laboratories used neutron activation analysis (NAA), with differing radiochemical separations. The study showed wide discrepancy in analytical results. Mean relative standard deviation for all laboratories was 77.9% between laboratories; 19.1% within-laboratories. Laboratories using NAA had only slightly better precision than did laboratories using the chemical method. The lowest level reported on the entire group of samples ranged among laboratories from 0.0089 to 0.65 ppm. Figures reported by a laboratory are, in general, consistently high or consistently low. The only differences in methodology which may possibly correlate with level of iodine obtained are the use of NAA technique and use of manual, rather than automated, colorimetry. |
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Authors:
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M M Heckman |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal - Association of Official Analytical Chemists Volume: 62 ISSN: 0004-5756 ISO Abbreviation: J Assoc Off Anal Chem Publication Date: 1979 Sep |
Date Detail:
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Created Date: 1980-04-26 Completed Date: 1980-04-26 Revised Date: 2000-12-18 |
Medline Journal Info:
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Nlm Unique ID: 7505559 Medline TA: J Assoc Off Anal Chem Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 1045-9 Citation Subset: IM |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Colorimetry Food Analysis* Iodine / analysis* Laboratories / standards Neutron Activation Analysis |
| Chemical | |
Reg. No./Substance:
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7553-56-2/Iodine |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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