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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Biofuel
Analysis 
