Abstract
The processors of oil and fat are in need of a quick determination method of iodine value of oils and fats especially in case of checking the degree of unsaturation of them in the hydrogenation process. Hoffman and Green modified the Wijs' method by employing mercuric acetate as catalyst and made it possible to determine the iodine value of a sample in ten minutes or so. Mercuric acetate, however, cannot be empolyed now because the reaction solution is hard to meet the regulation of water pollution and its disposal has become difficult.Authors have investigated other methods of quick determination of iodine value especially for the oils in the hydrogenation process and have found after all the Wijs' method could be appropriate by only shortening the reaction time to three minutes for the oils of the iodine value less than about 100. This quick Wijs' method gives almost equivalent value of Hoffman's although it tends to give less value than that of the Wijs' method.
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