FED. TEST METHOD STD. 141D
March 22, 2001
SECTION 8
REAGENTS, WATER, AND ETHYL ALCOHOL
1. SCOPE. This section covers the general requirements for the purity of reagents and water used
in the test methods of this standard. Detailed information for a particular reagent is given in the
method in which it is used.
2. REAGENTS. Unless otherwise indicated, all reagents should conform to the American
Chemical Society specifications for reagent chemicals, published in the latest edition of "Reagent
Chemicals, ACS Specifications," and available from the American Chemical Society, 1155
Sixteenth Street, NW, Washington, DC 20036. The Society can be contacted by telephone
(202) 872-4600, or (800) 227-5558, or Internet address: https://www.acs.org. Where such
specifications are not available, use commercial chemicals having the highest purity, and if
necessary, analyze these chemicals before use by proper analytical methods.
3. WATER. Unless otherwise indicated, references to water for use in the preparation of reagents
and in the analytical procedures should be understood to mean freshly distilled water.
4. ETHYL ALCOHOL. Ethyl alcohol should be absolute ethanol (100 percent or 200 proof), 95
percent ethanol (containing 5 percent water, 190 proof), or alcohol denatured according to formulas
of the Internal Revenue Service (see 5). The particular grade of ethanol to be used should be
specified in each method.
5. DENATURED ALCOHOL. Denatured alcohol corresponding to the following formulas is
prepared by adding the designated denaturant to 100 gallons of 95 percent (190 proof) ethyl
alcohol:
Formula Number
Denaturant (gallons)
1
wood alcohol (5)
2B
benzene (0.5)
3A
methyl alcohol (5)
12A
benzene (5)
13A
ethyl ether (10)
23A
acetone (10)
28
benzene (10)
30
methyl alcohol (10)
32
ethyl ether (5)
35
ethyl acetate (35)
35A
ethyl acetate (5)
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