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ASTM D6423-08

Historical Revision

Standard Test Method for Determination of pHe of Denatured Fuel Ethanol and Ethanol Fuel Blends

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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.

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.

SDO ASTM: ASTM International
Document Number D6423
Publication Date Dec. 15, 2008
Language en - English
Page Count 3
Revision Level 08
Supercedes
Committee D02.A0.02
Publish Date Document Id Type View
July 1, 2020 D6423-20A Revision
May 1, 2020 D6423-20 Revision
July 1, 2019 D6423-19 Revision
Dec. 1, 2018 D6423-18 Revision
Dec. 15, 2014 D6423-14 Revision
Dec. 15, 2008 D6423-08 Revision
June 10, 1999 D6423-99 Revision
July 1, 2004 D6423-99R04 Reaffirmation