CFR > Title 27 - Alcohol, Tobacco Products and Firearms > CHAPTER I—ALCOHOL AND TOBACCO TAX AND TRADE BUREAU, DEPARTMENT OF THE TREASURY > SUBCHAPTER A—LIQUORS (parts 1 to 31) > PART 21—FORMULAS FOR DENATURED ALCOHOL AND RUM > SUBPART E—Specifications for Denaturants (§21.91 to §21.133) > 21.94—Acetaldol.

21.94—Acetaldol.

(a) Purity. Not less than 90 percent by weight acetaldol as determined by the following method:
Dissolve 15 grams of the acetaldol in distilled water and dilute to 1 liter in a volumetric flask. Transfer 5 ml of this solution to a 250 ml glass-stoppered flask containing 25 ml distilled water. Add 25 ml of a freshly prepared 1 percent sodium bisulfite solution. Prepare a blank omitting the acetaldol solution. Place the flasks in a dark place away from excessive heat or cold and allow to stand six hours. Remove flasks and titrate free bisulfite with 0.1 N iodine solution using starch indicator.
Percent acetaldol by weight=(ml blank−ml test)×200×0.44/weight of sample
Titrations in excess of 100 percent may be obtained if the sample contains appreciable amounts of acetaldehyde.
(b) Specific gravity at 20 °C. 1.098 to 1.105.