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Essential oils. Determination of carbonyl value. Potentiometric methods using hydroxylammonium chloride
This International Standard specifies two methods for the potentiometric determination of the carbonyl value of essential oils which contain carbonyl compounds, either aldehydes or ketones.
Method I (see clause 5), is based on a cold oximation reaction with hydroxylammonium chloride. It applies to essential oils whose main constituents are easily oximable aldehydes and ketones, with the exception of citronellal which needs a low temperature to avoid cyclization phenomena and acetalization.
NOTE 1: In the case of citronellal the free hydroxylamine method described in ISO 1271 should be used.
NOTE 2: Examples of essential oils concerned are lemongrass, hesperydus and rue.
Method II (see clause 6), is based on a hot oximation reaction with hydroxylammonium chloride. It applies to essential oils whose main constituents are ketones which are in general oximable only with difficulty.
NOTE 3: Examples of essential oils concerned are vetiver, Dalmation sage and white artemisia which contain methylketones oximable only with difficulty.
The International Standard for a specific essential oil will specify the method to be used, whether this is the free hydroxylamine method described in ISO 1271 or another method.
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