[Code of Federal Regulations]
[Title 27, Volume 1]
[Revised as of January 1, 2008]
From the U.S. Government Printing Office via GPO Access
[CITE: 27CFR21.94]

[Page 548]
 
            TITLE 27--ALCOHOL, TOBACCO PRODUCTS AND FIREARMS
 
 CHAPTER I--ALCOHOL AND TOBACCO TAX AND TRADE BUREAU, DEPARTMENT OF THE 
                                TREASURY
 
PART 21_FORMULAS FOR DENATURED ALCOHOL AND RUM--Table of Contents
 
                Subpart E_Specifications for Denaturants
 
Sec.  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)x200x0.44/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 [deg]C. 1.098 to 1.105.