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Electronic Code of Federal Regulations

e-CFR data is current as of June 2, 2020

Title 27Chapter ISubchapter APart 21Subpart E → §21.94


Title 27: Alcohol, Tobacco Products and Firearms
PART 21—FORMULAS FOR DENATURED ALCOHOL AND RUM
Subpart E—Specifications for Denaturants


§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.

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