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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Journal home Journal issue About the journal. By using this site, you agree to the Terms of Use and Privacy Policy. To determine the iodine value of fats and oils and thus estimate the unsaturation of the fats and oils. This page was last edited on 18 Decemberat 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 Saturated fatty acids will not give the halogenation reaction.

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Iodine value

Already have an account? Triglycerides are made up of three fatty acids linked to glycerol by fatty acyl esters. Kapok seed oil [9]. These fatty acids can be classified into saturated or unsaturated based on the number of double bonds present in the fatty acid. 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 double bonds present in the naturally occurring unsaturated fats are in the Cis form. The Wijs method as the standard for iodine absorption J. Trans fatty acids are associated with health problems and cardiovascular diseases. Unsaturated fatty acids contain double bonds between the carbon atom vzlue addition to the single bonds present in the fatty acid chain.

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

Depending upon the degree of unsaturation, the fatty acids can combine with oxygen or halogens to form saturated fatty acids. Walnut oil [7] [8]. Views Read Edit View history.

Iodine monochloride is caustic. For reproduction of material from PPS: Unreacted iodine monobromide or monochloride is then allowed to react with potassium iodideconverting it to iodine, whose concentration can be determined by titration with sodium thiosulfate. From Wikipedia, the free iodkne.

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For reproduction of material from NJC: Register Already have an account? Journal of Japan Oil Chemists’ Society. A higher iodine value indicates a higher degree of unsaturation.

In all cases the Ref. Analytical chemistry Dimensionless numbers of chemistry Iodine. The chemical reaction associated with this method of analysis involves formation of the diiodo alkane R and R’ symbolize alkyl or valuue organic groups:. For reproduction of material from PCCP: On the other hand, linseed oil is highly unsaturatedwhich makes it a drying oilwell suited for making oil paints.

This would lead to undesirable side reactions, and thus falsifying a result consumption of bromine. March 17, Released: This unsaturation is in the form of double bondswhich react with iodine compounds.

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Wheat germ oil [5]. December 20, received: