ASTM-D7795 › Standard Test Method for Acidity in Ethanol and Ethanol Blends by Titration
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Scope
1.1 This test method covers the determination of acidity as acetic acid (see Specification D4806) in commonly available grades of denatured ethanol, and ethanol blends with gasoline ranging from E95 to E30. This test method is used for determining low levels of acidity, below 200 mg/kg (ppm mass), with the exclusion of carbon dioxide.
1.1.1 Test Method A—Developed specifically for measurement of acidity by potentiometric titration. This is the referee method.
1.1.2 Test Method B—Developed specifically for measurement of acidity by color end point titration.
1.2 The ethanol and ethanol blends may be analyzed directly by this test method without any sample preparation.
1.3 Review the current and appropriate Material Safety Data Sheets (MSDS) for detailed information concerning toxicity, first aid procedures, and safety precautions and proper personal protective equipments.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Some specific hazards statements are given in Section 7 on Hazards.
Significance and Use
5.1 This test method measures acidity in ethanol or ethanol blends quantitatively. Denatured fuel ethanol may contain additives such as corrosion inhibitors and detergents as well as contaminants from manufacturing that can affect the acidity of finished ethanol fuel. Very dilute aqueous solutions of low molecular mass organic acids, such as acetic acid, are highly corrosive to many metals. It is important to keep such acids at a very low level.
5.2 Acceptable levels of acidity in Ethanol or Ethanol blends can vary with different specifications but in general it is below 200 mg/kg (ppm). Knowledge of the acidity can be required to establish whether the product quality meets specification.
Keywords
acidity; denatured fuel ethanol; E30, E60 acetic acid; E95; ethanol; ethanol blends; potentiometric; titration; ICS Number Code 75.160.20 (Liquid fuels)
To find similar documents by ASTM Volume:
05.04 (Petroleum Products and Lubricants (IV): D6973 - latest)
05.05 (Combustion Characteristics; Manufactured Carbon and Graphite Products; Catalysts)
To find similar documents by classification:
75.160.20 (Liquid fuels Including gasoline, diesel, kerosene, etc.)
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Document Number
ASTM-D7795-15R22E01
Revision Level
2015 R22(E1) EDITION
Status
Current
Modification Type
New
Publication Date
May 4, 2022
Document Type
Test Method
Page Count
7 pages
Committee Number
D02.06