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ASTM D7318-07

Historical Revision

Standard Test Method for Existent Inorganic Sulfate in Ethanol by Potentiometric Titration

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1.1 This test method covers a potentiometric titration procedure for determining the total inorganic sulfate content of hydrous, anhydrous ethanol, and anhydrous denatured ethanol, which is added as a blending agent with spark ignition fuels. It is intended for the analysis of denatured ethanol samples containing between 1.0-20 mg/kg total inorganic sulfate.

1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.3 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. Material Safety Data Sheets are available for reagents and materials. Review them for hazards prior to usage.


Ethanol is used as a blending agent added to gasoline. Sulfates are indicated in filter plugging deposits and fuel injector deposits. When fuel ethanol is burned, sulfates may contribute to sulfuric acid emissions. Ethanol acceptability for use depends on the sulfate content. Sulfate content, as measured by this test method, can be used as one measure of determination of the acceptability of ethanol for automotive spark-ignition engine fuel use.

SDO ASTM: ASTM International
Document Number D7318
Publication Date Feb. 1, 2007
Language en - English
Page Count 6
Revision Level 07
Supercedes
Committee D02.03
Publish Date Document Id Type View
Feb. 14, 2019 D7318-19E01 Revision
Feb. 14, 2019 D7318-19 Revision
June 15, 2013 D7318-13 Revision
July 1, 2011 D7318-11 Revision
Feb. 1, 2007 D7318-07 Revision