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

Standard No.

ASTM D6423-08

Release Date

2008

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM D6423-14

Latest

ASTM D6423-20a

Scope

The acid strength, as measured by pHe, is a good predictor of the corrosion potential of ethanol fuels. It is preferable to total acidity because total acidity does not measure acid strength; overestimates the contribution of weak acids, such as carbonic acid; and may underestimate the corrosion potential of low concentrations of strong acids, such as sulfuric acid.

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.

ASTM D6423-08 Referenced Document

• ASTM D4806 Standard Specification for Denatured Fuel Ethanol for Blending with Gasolines for Use as Automotive Spark-Ignition Engine Fuel
• ASTM D5798 Standard Specification for Fuel Ethanol (Ed75-Ed85) for Automotive Spark-Ignition Engines

ASTM D6423-08 history

• 2020 ASTM D6423-20a Standard Test Method for Determination of pHe of Denatured Fuel Ethanol and Ethanol Fuel Blends
• 2020 ASTM D6423-20 Standard Test Method for Determination of pHe of Denatured Fuel Ethanol and Ethanol Fuel Blends
• 2019 ASTM D6423-19 Standard Test Method for Determination of pHe of Denatured Fuel Ethanol and Ethanol Fuel Blends
• 2018 ASTM D6423-18 Standard Test Method for Determination of pHe of Denatured Fuel Ethanol and Ethanol Fuel Blends
• 2014 ASTM D6423-14 Standard Test Method for Determination of pHe of Denatured Fuel Ethanol and Ethanol Fuel Blends
• 2008 ASTM D6423-08 Standard Test Method for Determination of pHe of Ethanol, Denatured Fuel Ethanol, and Fuel Ethanol (Ed75-Ed85)
• 1999 ASTM D6423-99(2004) Standard Test Method for Determination of pHe of Ethanol, Denatured Fuel Ethanol, and Fuel Ethanol (Ed75-Ed85)
• 1999 ASTM D6423-99 Standard Test Method for Determination of pHe of Ethanol, Denatured Fuel Ethanol, and Fuel Ethanol (Ed75-Ed85)