ASTM-D7795 › Standard Test Method for Acidity in Ethanol and Ethanol Blends by Titration
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1.1 This test method covers the determination of acidity as acetic acid (see Specification ) 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 Procedure A—Developed specifically for measurement of acidity by potentiometric titration. This is the referee method.
1.1.2 Procedure 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 on Hazards.
acidity; denatured fuel ethanol; E30, E60 acetic acid; E95; ethanol; ethanol blends; potentiometric; titration;; ICS Number Code 75.160.20 (Liquid fuels)
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Feb. 1, 2016