Animal and vegetable fats and oils — Determination of acid value and acidity

The REX Ti-50 Automatic Potential Titrator allows quick and simple determinations of the acid value and acidity of animal and vegetable fats and oils.

 

1. Standard Reference

ISO 660:2020 《Animal and vegetable fats and oils — Determination of acid value and acidity》

This document is applicable to refined and crude vegetable or animal fats and oils, soap stock fatty acids or technical fatty acids. It does not apply to waxes.

Acid value :number of milligrams of potassium hydroxide required to neutralize the free fatty acids present in 1 g of fat, when determined in accordance with the procedure specified in this document

Note 1 to entry: The acid value is expressed in milligrams per gram.

Acidity :content of free fatty acids determined according to the procedure specified in this document

Note 1 to entry: The acidity is expressed as a percentage by mass. If the result of the determination is reported as acidity without further explanation, this is, by convention, the acidity based on the oleic acid content.

 

 

2. The Principle  

The sample is dissolved in a suitable solvent mixture, and the acids present are titrated with an ethanolic or methanolic solution of sodium or potassium hydroxide.

 

3. Recommended Configuration

1. Ti-50 Automatic Potential Titrator 

• Range：(-2000.00~2000.00) mV
• mV Accuracy：±0.03% or ±0.2mV
• 1 extra burette driver can be installed (optional).
• Replaceable burette with high-accuracy (10 ml or 20 ml selectable).
• Support acid-base titration, non-aqueous aqueous phase titration, constant titration, REDOX titration, precipitation titration, complexation titration
• Support the following titration modes: DET (dynamic equivalence point titration), MET (monotone equivalence point titration), SET (Preset Endpoint Titration) and MAT (manual titration).
• Titration methods, curves and results are displayed in detail.

2. Auxiliary titration unit 20mL
3. Burette valve device 20mL (SC5.461.057)
4. Anti-diffusion capillary
5. Electrodes：982211 Non Aqueous pH Titration Electrode

 

Model	982211
Name	Non aqueous pH titration electrode
Connector Type	S7
Sensor material	Glass
Dimension	Φ12×120mm
Measuring unit material	Glass
Working Temperature	0-60℃
Application	Non aqueous acid-base Titration

 

4. Titration Setting

• Non-aqueous aqueous phase titration
• Sample: DET (dynamic equivalence point titration)
• Blank Sample: MET (monotone equivalence point titration)

 

5. Titration curve