ISO 1279:1996 Preview
Essential oils -- Determination of carbonyl value -- Potentiometric methods using hydroxylammonium chloride
This standard was last reviewed and confirmed in 2017. Therefore this version remains current.
Gives two methods for the potentiometric determination of the carbonyl value of essential oils which contain carbonyl compounds. Method 1 is based on a cold oximation reaction with hydrxoylammonium chloride with exception of citronellal which need a low temperature to avoid cyclization phenomena and acetylization. Method 2 is based on a hot oximation reaction with hydroxylammonium chloride and applies to essential oils whose main constituents are ketones which are general oximable only with difficulty.