给出了两种电位滴定法测定含羰基化合物精油羰基值的方法。方法1基于与羟基氯化铵的冷肟化反应，但香茅醛除外，香茅醛需要低温以避免环化现象和乙酰化。方法2基于与氯化羟胺的热肟化反应，适用于主要成分为酮的精油，这些酮通常很难肟化。

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.