ISO 7660:1983 Preview
Essential oils -- Determination of ester value of oils containing difficult-to-saponify esters
This standard was last reviewed and confirmed in 2017. Therefore this version remains current.
The method consists in hydrolysis of the esters present in a test portion by heating in the presence of a standard volumetric solution of potassium hydroxide in dimethylsulfoxide, and back-titration of the excess potassium hydroxide with a standard volumetric solution of sulfuric acid or hydrochloric acid.