Laboratory Products 17 Determination of iodine Value (IV) in Fats and Oils Using Applied Thermometric Titration
Iodine value (IV) is a measure of the total number of double bonds present in fats and oils. It is expressed as the ‘number of grams of iodine that will react with the double bonds in 100 grams of fats or oils’. The determination is conducted by dissolving a weighed sample in a non-polar solvent such as cyclohexane, then adding glacial acetic acid. Metrohm Application Note AN-H-076 describes the procedure.
The double bonds are reacted with an excess of a solution of iodine monochloride in glacial acetic acid (Wijs solution). Mercuric ions are added to hasten the reaction. After completion of the reaction, the excess iodine monochloride is decomposed to iodine by the addition of aqueous potassium iodide solution, which is then titrated with standard sodium thiosulphate solution.
The titration procedure eliminates operator involvement in the determination. The Wijs’ solution is added, with a 300 seconds (5 minutes) wait programmed before 10 mL of 15% KI solution is added. The titration commences automatically.
Thermometric titration has been successfully used to analyse foods ranging from dairy products, instant noodles, cheese, canned fish, dry snack food, sauces, soups, and more.
For further information contact Metrohm UK Ltd.
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New Laboratory Product Offers Sustainable Savings
A UK electronic airflow control and monitor manufacturer and consultant has created an integrated variable air volume (VAV) airflow and auto sash controller, offering industrial and educational laboratory customers the opportunity to reduce energy costs by up to 85%, while cutting carbon emissions and saving time.
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of customer requests, Temperature Electronics Ltd’s (TEL) AFA4000 VAV Controller and Auto Sash Controller automatically adjusts airflow according to need, decreasing the volume of air extracted when laboratory fume cupboards are not in use, minimising energy consumption.
TEL’s own research has demonstrated that customers fitting its VAV controllers to their fume cupboards can reduce energy costs by up to 85%.
In addition to its VAV function, the unit may also be programmed to serve as an integrated auto sash controller, which automatically closes fume cupboards when there is no operator present, again promoting energy savings.
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TEL’s Director, Richard Eady, said: “We’ve been working on this product for a long time and I think that is apparent to anyone who sees it. It combines environmental sustainability with ease of use, cost- effectiveness, elegant design and of course also the unparalleled reliability for which TEL has become known worldwide.”
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TEL has also launched an AFA4000 range of constant air volume (CAV) airflow monitors. The AFA4000/1 and 2 Airflow Monitors also offer optional auto sash integration, and the latter features a customisable push-button function.
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The 48 page handbook provides you with useful tips and hints on how to obtain the best possible results from your measurements.
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Over the last 50 years the use of thermal analysis has expanded into many new research and application fi elds across different industries. In many cases, the thermal analysis techniques employed to analyse new materials require specifi c accessories and measurement parameters as well as special sample preparation.
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