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Determination of the iodine number of biofuels by titration
Iodine number in fatty acids and fatty acid methyl esters (FAME) The iodine number is a measure for the number of double bonds in a sample. It is the amount of iodine (in g/100 g sample) that can be added to the sample under the given conditions. The determination of the iodine number is covered by European standard EN 14 111. An aliquot of the biofuel sample is dissolved in a mixture of cylcohexane/glacial acetic acid and treated with Wijs reagent. After a defined time has elapsed, potassium iodide and water are added. The released elemental iodine is then titrated with sodium thiosulfate solution. EN 14 111 allows both optical (with starch solution as the indicator) and potentiometric endpoint determination. Potentiometric endpoint titrator by Metrohm With its space-saving Dosino technology the titrator Titrando allows fully automatic and safe solvent addition. The recommended electrode is the metal electrode Pt Titrode with a maintenance-free reference system (pH glass membrane). Product information |
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