ISO 3961:2018 PDF

Animal and vegetable fats and oils — Determination of iodine value

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Title (English):

ISO 3961:2018

Animal and vegetable fats and oils — Determination of iodine value

Document status:: Withdrawn
Format:: Electronic (PDF)
Number of pages:: 12
Publication date:: July 24, 2018
Edition:: ISO IS 3961 edition 6 version 1
ICS:: 67.200.10

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Description (English):

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].

Technical details

Technical committee: ISO/TC 34/SC 11 - Animal and vegetable fats and oils
SKU: ISO 3961:2018

Abstract

Overview

ISO 3961:2018 specifies a reference method for determining the iodine value (IV) of animal and vegetable fats and oils. The standard defines the volumetric (Wijs) titration procedure as the reference method and includes an informative Annex B that describes how to calculate IV from fatty acid composition (based on AOCS Cd 1c‑85). Annex B is not applicable to fish oils and can give different results for cold‑pressed, crude/unrefined, or partially hydrogenated oils because calculated IV is affected by impurities and thermal degradation products.

Keywords: ISO 3961:2018, iodine value, IV determination, Wijs reagent, fatty acid composition.

Key topics

Scope and applicability
- Reference method for IV of animal and vegetable fats and oils.
- Annex B: calculated IV from fatty acid data (not for fish oils).
Principle
- Reaction of unsaturated bonds with Wijs reagent (iodine monochloride in acetic acid), liberation of iodine, and titration with standardized sodium thiosulfate.
Reagents and safety
- Use analytical grade reagents; Wijs reagent is corrosive and toxic - use a fume hood and appropriate PPE.
- Key reagents: Wijs reagent, cyclohexane/acetic acid solvent, KI solution, starch indicator, standardized Na2S2O3, water.
Apparatus and sampling
- Standard lab glassware, analytical balance, pipettes, burettes or autotitrators.
- Sampling is covered by ISO 5555 (recommended); sample preparation by ISO 661.
Procedure and calculation
- Reaction time: typically 1 h (IV

Related standards

Mentioned in the description and other ISO standards

Overview

Keywords: ISO 3961:2018, iodine value, IV determination, Wijs reagent, fatty acid composition.

Key topics

Scope and applicability
- Reference method for IV of animal and vegetable fats and oils.
- Annex B: calculated IV from fatty acid data (not for fish oils).
Principle
- Reaction of unsaturated bonds with Wijs reagent (iodine monochloride in acetic acid), liberation of iodine, and titration with standardized sodium thiosulfate.
Reagents and safety
- Use analytical grade reagents; Wijs reagent is corrosive and toxic - use a fume hood and appropriate PPE.
- Key reagents: Wijs reagent, cyclohexane/acetic acid solvent, KI solution, starch indicator, standardized Na2S2O3, water.
Apparatus and sampling
- Standard lab glassware, analytical balance, pipettes, burettes or autotitrators.
- Sampling is covered by ISO 5555 (recommended); sample preparation by ISO 661.
Procedure and calculation
- Reaction time: typically 1 h (IV

ISO 3961:2018 PDF

Technical details

Abstract

Overview

Key topics

Related standards

Abstract

Overview

Key topics

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