ASTM D 6423 : 2008
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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Standard Test Method for Determination of pHe of Ethanol, Denatured Fuel Ethanol, and Fuel Ethanol (Ed75-Ed85)
Hardcopy , PDF
11-11-2014
English
15-12-2008
Important note : All end users must be registered with an Account prior to user licenses being assigned.| Committee |
D 02
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| DocumentType |
Test Method
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| Pages |
4
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| PublisherName |
American Society for Testing and Materials
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| Status |
Superseded
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| SupersededBy | |
| Supersedes |
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
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 D 4806 : 2019 | Standard Specification for Denatured Fuel Ethanol for Blending with Gasolines for Use as Automotive Spark-Ignition Engine Fuel |
| API TR 939-D:2007+ADD 1:2013 | Technical Report 939-D - Stress Corrosion Cracking of Carbon Steel in Fuel Grade Ethanol: Review and Survey |
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