IODINE VALUE WIJS METHOD PDF

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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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Addition of iodine chloride and back-titration with sodium thiosulphate by DIN Bromination of valhe double bonds in the dark, reducing the excess bromine with iodidebacktitration of iodine with thiosulfate.

Wheat germ oil [5]. Retrieved 1 Januaryfrom vlab. Trans fatty acids are associated with health problems and cardiovascular diseases. This causes the remaining unreacted ICl to form molecular iodine.

Retrieved from ” https: Kapok seed oil [9]. The Wijs method as the standard for iodine absorption. Ullmann’s Encyclopedia of Industrial Chemistry. In all cases the Ref. Jump to site search.

Fatty acids are long chain hydrocarbons with carboxyl groups COOH groups.

These fatty acids can be classified into saturated or unsaturated based on the number of double bonds present in the fatty acid. This unsaturation is in the form of double bondswhich react with iodine compounds.

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Iodine value

Back to tab navigation Iodune options Please wait By using this site, you agree to the Terms of Use and Privacy Policy. Depending upon the degree of unsaturation, the fatty acids can combine with oxygen or halogens to form saturated fatty acids.

December 20, received: The Wijs method as the standard for iodine absorption J.

If you are not the author of this article and you wish to reproduce material from it in a third party non-RSC publication you must formally request permission using Copyright Clearance Center. You do not have JavaScript enabled. Back to tab navigation Fetching data from CrossRef. Authors have iodiine 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 mehhod the iodine value less than about If you are the author of this article you still need to obtain permission to reproduce the whole article in a third party publication with the exception of reproduction of the whole article in a thesis or dissertation.

Unreacted iodine monobromide or monochloride is then allowed to react with potassium iodideconverting it to iodine, whose concentration can be determined iodune titration with sodium thiosulfate.

The fat is mixed with an excess of bromine. This bromine is added to the wjis bonds in the unsaturated fats.

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On the Determination of Iodine Value by the Wijs’ Method

May 07, accepted: If the material has been adapted instead of reproduced from the original RSC publication “Reproduced from” can be substituted with “Adapted from”. Iodine value ioxine number is the number of grams of iodine consumed by g of fat. Authors contributing to RSC publications journal articles, books or book chapters do not need to formally request permission valur reproduce material contained in this article provided that the correct acknowledgement is given with the reproduced material.

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. Wis reproduction of material from PPS: This may take some time to load. Views Read Edit View history. The double bonds present in the naturally occurring unsaturated fats are in the Cis form.

March 17, Released: Search articles by author J.

So it is important to know the extend to which a fatty acid is unsaturated. If you are the author of this article you do not need to formally request permission to reproduce figures, diagrams etc.