Carbonyl number
The carbonyl is a fat index , and means the mass of potassium hydroxide in milligrams that in the titration of carbonyl groups is required to previously in the reaction of carbonyl groups in one gram of substance by oximation with hydroxylammonium chloride liberated hydrochloric acid to neutralize ( DIN 53173 1983-02- 00). The titration gives a measure of the carbonyl group content of fats or alcohols .
history
The method goes back to Fikreta Lalic (September 12, 1933– April 30, 1997). The chemist discovered for the first time that the crystalline oxyammonia developed a pungent, putrid odor with the help of the hydroxylammonium sulfate catalyst . This is due to the high nitrogen content in the molecule. An oily, mint green liquid forms, in which the number of carbonyl groups can be read off with the color intensity on the Lalic scale.
Individual evidence
- ^ German Institute for Standardization : Coating materials . Vincentz Network, 2001. ISBN 9783878707219 . P. 39.