NEWS
12
2025
-
11
Determination of Acid Value of Edible Oils by Fully Automated Potentiometric Titration
1. Introduction
Acid value determination reflects the degree of acidity or rancidity of oil and is one of the basic indicators for detecting whether an oil is rancid.
Common edible oils include vegetable oils, animal oils, and some blended oils. Although all are edible oils, their acid values differ. Acid value is a crucial aspect of oil testing, enabling comparison of quality differences and differentiation between good and bad oils.
This method uses the JH-T6 fully automated potentiometric titration system from Shanghai Jiahang to determine the acid value of edible oils. It exhibits good repeatability and a clear abrupt change, accurately determining the acid value of the oil and providing a reliable basis for oil testing.
2. Instruments and Reagents
2.1 Instruments
JH-T6 fully automatic potentiometric titrator, non-aqueous pH composite electrode, 10mL burette
2.2 Reagents
Potassium hydroxide-ethanol solution (0.1006mol/L), anhydrous diethyl ether-isopropanol (1:1).
3. Experimental Methods
3.1 Experimental Procedure
Accurately weigh 20.0000g of sample, accurate to 0.0001g. Dissolve the sample completely in anhydrous diethyl ether and isopropanol mixed solution (1:1). Titrate with potassium hydroxide-ethanol standard solution (0.1mol/L) to the potentiometric endpoint and record the endpoint volume. Perform a blank test simultaneously.
3.2 Instrument Parameters
4. Results and Discussion
4.1 Experimental Data
4.1.2 Determination of Acid Value of Edible Oils:
4.2 Calculation Formula
Acid Value Calculation Formula:
m
Where: X---Acid value of the sample (calculated as potassium hydroxide), in milligrams per gram (mg/g)
V---Volume of potassium hydroxide standard titration solution consumed by the sample, in milliliters (ml)
c---Actual concentration of potassium hydroxide standard titration, in moles per liter (mol/L)
m---Mass of the sample, in grams (g)
56.1---Molar mass of potassium hydroxide, in grams per mole (g/mol)
4.3 Titration Spectrum
1) Sunflower Oil
2) Peanut oil
3) Corn oil
4.4 Conclusion
The results show that the determination of acid value in several edible oils using a fully automatic potentiometric titrator exhibits good repeatability and meets the requirements of the national standard.
The operation is safe, reduces contact between humans and organic reagents, and improves work efficiency and experimental accuracy.
References
[1] GB/5009.229-2016 National Food Safety Standard - Determination of Acid Value in Food. [S]
Keyword:
Automated Potentiometric Titration
WELCOME TO JIAHANG
Do you want to Send Inquiry ?
COMPANY CONTACTS
Office Tel: +86-177-2114-8861
E-mail:gm@jiahanglab.com
Factory： NO.3570 Jiasong north Rd, Jiading Dist, Shanghai , China
R&D Sales Center:
13F,BD1,Lane 925, Aksu South Rd, Jiading Dist Shanghai , China
Mob/Whatspp: 0086 177 2114 8861
Copy Right © 2023 Shanghai Jiahang Instruments Co., Ltd. All Rights Reserved
0086 17721148861
+86-17721148861
E-mail 
