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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Starch is used as the indicator for this reaction so that the liberated iodine will react with starch to give purple coloured product and thus the endpoint can be observed.

Jump to main content. Trans fatty acids are associated with health problems and cardiovascular diseases.

Saturated fatty acids vxlue only single bond between the carbon atoms and are tend to be solids at room temperature. Journal of Oil Chemists’ Society, Japan. This quick Wijs’ method gives almost equivalent value of Hoffman’s although it tends to give less value than that of the Wijs’ method. This particular analysis is an example of iodometry.

The Wijs method as the standard for iodine absorption – Analyst (RSC Publishing)

Authors contributing to RSC publications journal articles, books or book chapters do not need to formally request permission to reproduce material contained in this article provided that the correct acknowledgement is given with the reproduced material. 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.

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This page was last edited on 18 Decemberat On the other hand, linseed oil is highly unsaturatedwhich makes it a drying oilwell suited for making oil paints. Retrieved from ” https: Already have an account? Journal of Oleo Science. The first page of this article is displayed as the abstract. 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.

This may take some time to load. The double bonds present in the naturally occurring unsaturated fats are in the Cis form. Back to tab navigation. Jump to site search.

Iodine value

Bromination of the double bonds in the dark, reducing the excess bromine with iodidebacktitration of iodine with thiosulfate. Back to tab navigation Fetching data from CrossRef. Please enable JavaScript to access the full features of the site or access our non-JavaScript page. Previous article Next article.

Rapeseed and Canola Oil: After the reaction is complete, the amount of iodine that has reacted is determined by adding a solution of potassium iodide to the reaction product.

Valie causes the remaining unreacted ICl to form molecular iodine.

Iodine monochloride is caustic. Addition of iodine chloride and back-titration with sodium thiosulphate by DIN Search articles by author J.

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Ullmann’s Encyclopedia of Industrial Chemistry. Depending upon vxlue degree of unsaturation, the fatty acids can combine with oxygen or halogens to form saturated fatty acids. 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 iiodine only shortening the reaction time to three minutes for the oils of the iodine value less than about Views Read Edit View history.

Unsaturated fatty acids can be converted into saturated by the process of hydrogenation. Analytical chemistry Dimensionless numbers of chemistry Iodine. So handle the reagent with gloves. Information related to the author.

Back to tab navigation Download options Please wait Previous Article Next Article. The Wijs method as the standard for iodine absorption. Triglycerides are made up of three fatty acids linked to wijss by fatty acyl esters.

The fat is mixed with an excess of bromine. To determine the iodine value of fats and oils and thus estimate the unsaturation of the fats and mtehod. Go to our Instructions for using Copyright Clearance Center page for details. They are likely to exists as liquids at room temperature. A higher iodine value indicates a higher degree of unsaturation.