ASTM-D6423 2008

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D6423-08 Standard Test Method for Determination of pHe of Ethanol, Denatured Fuel Ethanol, and Fuel Ethanol (Ed75-Ed85)

Published By	Publication Date	Number of Pages
ASTM	2008	3

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Categories: 27.060.10 - Liquid and solid fuel burners, ASTM

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Description

ASTM D6423-08

Historical Standard: Standard Test Method for Determination of pHe of Ethanol, Denatured Fuel Ethanol, and Fuel Ethanol (Ed75-Ed85)

ASTM D6423

Scope

1.1 This test method covers a procedure to determine a measure of the acid strength of high ethanol content fuels. These include ethanol, denatured fuel ethanol, and fuel ethanol (Ed75-Ed85). The test method is applicable to fuels containing nominally 70 volume % ethanol, or higher, as described in Specifications D 4806 and D 5798.

1.2 Acid strength as measured in this test method is defined as pHe. A pHe value for alcohol solutions is not comparable to pH values of water solutions. For example, a 1.5×10^-5 M (18 ppm) solution of H₂SO₄ gives a pH of about 5.5 in water solution, but, depending on buffering strength, a pHe as low as 1 to 2 in unadditized alcohol fuel.

1.3 The value of pHe measured will depend somewhat on the fuel blend, the stirring rate, and the time the electrode is in the fuel.

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.

Keywords

acid strength; automotive spark ignition engine fuel; corrosion potential; denatured fuel ethanol; ethanol; fuel ethanol; pHe; Denatured fuel ethanol; Ethanol; Fuel ethanol (Ed75-Ed85); pH

ICS Code

ICS Number Code 27.060.10 (Liquid and solid fuel burners)

DOI: 10.1520/D6423-08

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents Terminology Summary of Test Method Significance and Use
2	Apparatus Reagents and Materials Sample Containers Standardization of Assembly
3	Procedure Precision and Bias Keywords

Additional information

Standard Title	D6423-08 Standard Test Method for Determination of pHe of Ethanol, Denatured Fuel Ethanol, and Fuel Ethanol (Ed75-Ed85)
Published Code	ASTM
Publication Date	2008
Pages Count	3
ICS Codes	27.060.10 - Liquid and solid fuel burners