BS EN ISO 3961:2018 pdf free
BS EN ISO 3961:2018 pdf free.Animal and vegetable fats and oils – Determination of iodine value
This document specifies a reference method for the determination of the iodine value (commonly known in the industry as IV) of animal and vegetable fats and oils, hereinafter referred to as fats.
Annex B describes a method for the calculation of the IV from fatty acid compositional data. This method is not applicable to fish oils. Furthermore, cold-pressed, crude and unrefined vegetable oils as well as (partially) hydrogenated oils can give different results by the two methods. The calculated IV is affected by impurities and thermal degradation products.
NOTE The method in Annex B is based upon the AOCS Official method Cd 1C-85[10].
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 661, Animal and vegetable fats and oils一Preparation of test sample
For the purposes of this document, the following terms and definitions apply.
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mass of halogen, expressed as iodine, absorbed by the test portion following the specified procedure,divided by the mass of the test portion
Note 1 to entry: The IV is expressed as a mass fraction in grams per 100 g of fat.
Dissolution of a test portion in solvent and addition of Wijs reagent. After a specified time, addition of potassium iodide and water, and titration of the liberated iodine with sodium thiosulfate solution.
NOTE Annex B describes a method for the calculation of the IV from fatty acid compositional data. However,this is not intended to be a rapid method. The method gives two results from one analytical procedure. The volumetric method is the reference method.BS EN ISO 3961 pdf download.
