Collaborative test of determination of iodine value in fish oils. 2. Carbon tetrachloride or cyclohexane/acetic acid as solvents |
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Authors: | Stuart M. Barlow Anthony P. Bimbo Eric L. Miller Snorri Thorisson D. E. Walters |
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Affiliation: | 1. International Fishmeal and Oil Manufacturers Association, AL3 4PA, St. Albans, United Kingdom 2. Zapata Protein (USA) Inc., 22539, Reedville, Virginia 4. Department of Clinical Veterinary Medicine, University of Cambridge, CB3 0ES, Cambridge, United Kingdom 5. Icelandic Fisheries Laboratory, 121, Reykjavik, Iceland 7. The Babraham Institute and Churchill College, University of Cambridge, CB3 0DS, Cambridge, United Kingdom
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Abstract: | Nine laboratories participated in a collaborative test to determine the iodine value (IV) of eight samples of fish oil (four with IV<150; four with IV>150) with either carbon tetrachloride (AOCS Official Method Cd 1–25) or cyclohexane/acetic acid (AOCS Recommended Practice Cd 1d-92) as solvent and 1 h of reaction time. Laboratories received coded duplicate samples (hidden duplicates) and carried out duplicate determinations on each oil by each method (open duplicates). Replacing carbon tetrachloride with cyclohexane/acetic acid resulted in similar mean values for both low- and high-IV oils and similar estimates of repeatability and reproducibility. The repeatability standard deviation (s r ), based on hidden duplicates, with carbon tetrachloride and cyclohexane/acetic acid were 1.71 and 1.55, respectively. The corresponding reproducibility standard deviations were 1.81 and 1.98. |
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