Peroxide Value-lodometric of Animal and Vegetable Fats and Oils

Release Time

2023-01-23 00:00

The REX Ti-50 Automatic Potential Titrator allows quick and simple determinations of the Peroxide value (PV) of animal and vegetable fats and oil.

The oxidation of lipids (fats and oils) during processing and storage causes food toxicity. Peroxide value (PV) is an important characteristic of the edible oils quality and appears as an indicator of the lipid oxidation and oil properties deterioration.

PV is defined as milliequivalent or millimole of hydroperoxides per kilogram of oil (meq O2/kg of oil) .

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1. Standard Reference

ISO 27107:2008Animal and vegetable fats and oils –Determination of peroxide value-Potentiometric end-point determination》

ISO 27107:2008 specifies a method for the potentiometric end-point determination of the peroxide value, in milliequivalents of active oxygen per kilogram, of animal and vegetable fats and oils.

2.  The Principle

The sample is dissolved in isooctane and glacial acetic acid, and potassium iodide is added. The iodide liberated by the peroxides is determined volumetrically with a sodium thiosulfate standard solution. The end-point of the titration is determined electrochemically.


3. Recommended Configuration

  1. Ti-50 Automatic Potential Titrator 
    1. Range:(-2000.00~2000.00) mV
    2. mV Accuracy:±0.03% or ±0.2mV
    3. 1 extra burette driver can be installed (optional).
    4. Replaceable burette with high-accuracy (10 ml or 20 ml selectable).
    5. Support acid-base titration, non-aqueous aqueous phase titration, constant titration, REDOX titration, precipitation titration, complexation titration
    6. Support the following titration modes: DET (dynamic equivalence point titration), MET (monotone equivalence point titration), SET (Preset Endpoint Titration) and MAT (manual titration).
    7. Titration methods, curves and results are displayed in detail.
    8. Includes 213-01 platinum electrode and 232-01 reference electrode


  1. Auxiliary titration unit 20mL
  2. Burette valve device 20mL (SC5.461.057)
  3. Anti-diffusion capillary
  4. Electrodes
    1. 213-01 Platinum electrode
    2. 232-01 Reference electrode(The filling solution needs to change to saturated ethanol lithium chloride solution)




Platinum electrode

Connector Type


Sensor material




Measuring unit material


Working Temperature

5~50 ℃


REDOX Titration




Reference electrode

Type of electrode

Saturated single-junction calomel electrode

Connector Type

U shape terminal

Fill Solution

Saturated KCl solution

junction material


Sensor material



Φ12×120 mm

Working Temperature

5~55 ℃

4.Titration Setting

  1. REDOX titration
  2. Sample: DET (dynamic equivalence point titration)
  3. Blank Sample: MET (monotone equivalence point titration)


5. Titration curve