Title: Essential oils. Determination of carbonyl value. Potentiometric methods using hydroxylammonium chloride
ISO 1279:1996 gives two (2) 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.
Quelle: 130184/2006-10-31
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