ASTM-D7318 Standard Test Method for Existent Inorganic Sulfate in Ethanol by Potentiometric Titration

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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.

Significance and Use

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.


ethanol; lead; potentiometric; sulfate; titration; total inorganic sulfate; ICS Number Code 71.040.40 (Chemical analysis); 75.160.20 (Liquid fuels)

To find similar documents by ASTM Volume:

05.03 (Petroleum Products and Lubricants (III): D6138 - D6971)

05.04 (Petroleum Products and Lubricants (IV): D6973 - latest)

To find similar documents by classification:

71.040.40 (Chemical analysis Including analysis of gases and surface chemical analysis)

75.160.20 (Liquid fuels Including gasoline, diesel, kerosene, etc.)

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Document Number

ASTM-D7318 - 19e1

Revision Level

2019(E1) EDITION



Modification Type


Publication Date

Dec. 15, 2019

Document Type

Test Method

Page Count

6 pages

Committee Number