EN 14111 Fat and oil derivatives - Fatty Acid Methyl Esters (FAME) - Determination of iodine value
1 Scope
This European Standard specifies a titrimetric method for the determination of iodine value in Fatty Acid Methyl Esters, hereinafter referred as FAME.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments).
EN ISO 661:1995, Animal and vegetable fats and oils - Preparation of test sample (ISO 661:1989).
EN ISO 3696, Water for analytical laboratory use - Specification and test methods (ISO 3696:1987).
3 Terms and definitions
For the purposes of this European Standard, the following term and definition apply.
3.1 iodine value
mass of halogen, expressed as iodine, absorbed by the test portion when determined in accordance with the procedure specified in this European Standard, divided by the mass of the test portion.
Iodine value is reported as grams of iodine per 100 g of FAME.
4 Principle
A test portion is dissolved in a mixed solvent and then Wijs reagent is added. After a specified time, potassium iodide and water are added to the sample and the liberated iodine is titrated using a sodium thiosulfate standardized solution.
