IODINE VALUE WIJS METHOD PDF
Iodine value means the “g” value of halogen which adhere to g of methods such as Hanus method and Wijs method for Iodine value. 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. This test method covers the determination of the iodine value of fats and iodine value of fats and oils that do not contain conjugated 3 Wijs Solution ( Iodine Monochloride Solution) may be purchased commercially. 1.
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The Wijs method as the standard for iodine absorption – Analyst (RSC Publishing)
By using this site, you agree to the Terms of Use and Privacy Policy. The iodine value or iodine adsorption value or iodine number or iodine index in chemistry is the mass of iodine in grams that is consumed by grams of a chemical substance. Fatty acids are long chain hydrocarbons with carboxyl groups COOH groups. 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 Journal of Japan Oil Chemists’ Society.
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wiks For reproduction of material from PCCP: This bromine is added to the double bonds in the unsaturated fats. For reproduction of material from all other RSC journals and books: Back to tab navigation. This particular analysis is an example of iodometry. Unsaturated fatty acids can be converted into saturated by the process of hydrogenation.
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Hoffman and Green modified the Wijs’ method by employing mercuric acetate as catalyst and made it wis to determine the iodine value of a sample in ten minutes or so. Jump to site search. Please enable JavaScript to access the full features of the site or access our non-JavaScript page.
Iodine value
So it is important to know the extend to which a fatty acid is unsaturated. To determine wijx iodine value of fats and oils and thus estimate the unsaturation of the fats and oils. 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.
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Estimation of Iodine Value of Fats and Oils.
This unsaturation is in the form of double bondswhich react with iodine compounds. March 17, Released: Search articles by author J.
On the Determination of Iodine Value by the Wijs’ Method
Wheat germ oil [5]. The double bonds present in the naturally occurring unsaturated wijd are in the Cis form. Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.
Iodine value or number is the number of grams of iodine consumed by g of fat. Views Read Edit Methpd history. For reproduction of material from NJC: Retrieved 1 Januaryfrom vlab.
Analytical chemistry Dimensionless numbers of chemistry Iodine. Iodine numbers are often used to determine the amount of unsaturation in fatty acids.
