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Homepage>BS Standards>71 CHEMICAL TECHNOLOGY>71.100 Products of the chemical industry>71.100.60 Essential oils>BS ISO 1279:1996 Essential oils. Determination of carbonyl value. Potentiometric methods using hydroxylammonium chloride
immediate downloadReleased: 2001-09-15
BS ISO 1279:1996 Essential oils. Determination of carbonyl value. Potentiometric methods using hydroxylammonium chloride

BS ISO 1279:1996

Essential oils. Determination of carbonyl value. Potentiometric methods using hydroxylammonium chloride

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Standard number:BS ISO 1279:1996
Pages:12
Released:2001-09-15
ISBN:0 580 38318 0
Status:Standard
DESCRIPTION

BS ISO 1279:1996


This standard BS ISO 1279:1996 Essential oils. Determination of carbonyl value. Potentiometric methods using hydroxylammonium chloride is classified in these ICS categories:
  • 71.100.60 Essential oils

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.