IFU method No. 3 Titratable acidity (Rev. 2017)

The IFU is pleased to announce that the Methods of Analysis Commission have issued a revision to IFU No.3 Titratable acidity which is available in the catalogue of methods and can be accessed via the website www.ifu-fruitjuice.com.

Method principle

Titratable acidity is a measure of the content of mineral and organic acids determined by potentiometric titration with standard volumetric sodium hydroxide solution either to a pH value of 7.0, for the determination of the acidity expressed as malic or tartaric acids and / or to a pH of 8.1 for the determination of the acidity expressed as citric acid.

Revision for 2017

In lemon and lime juice concentrates the total acid is often expressed in gram citric acid per litre (GPL). A GPL calculation is now included based on the total acidity at pH 8,1 expressed as citric acid as stated in this method.