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ASTM D7318-19e1

(Test Method)

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

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

SIGNIFICANCE AND USE
5.1 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.
SCOPE
1.1 This test method covers a potentiometric titration procedure for determining the existent 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 mg/kg to 20 mg/kg existent inorganic sulfate.  
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
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, health, and environmental 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.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
13-Feb-2019
ICS
71.040.40 - Chemical analysis
75.160.20 - Liquid fuels
Technical Committee
D02 - Petroleum Products, Liquid Fuels, and Lubricants
Drafting Committee
D02.03 - Elemental Analysis
Current Stage
Ref Project

Relations

Refers
ASTM D6299-17a - Standard Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance
Effective Date
15-Nov-2017
Refers
ASTM D6299-17b - Standard Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance
Effective Date
15-Dec-2017
Refers
ASTM D6299-17 - Standard Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance
Effective Date
01-Jan-2017

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ASTM D7318-19e1 - Standard Test Method for Existent Inorganic Sulfate in Ethanol by Potentiometric TitrationASTM D7318-19e1 - Standard Test Method for Existent Inorganic Sulfate in Ethanol by Potentiometric Titration
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ASTM D7318-19e1 - Standard Test Method for Existent Inorganic Sulfate in Ethanol by Potentiometric Titration
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
´1
Designation: D7318 − 19
Standard Test Method for
Existent Inorganic Sulfate in Ethanol by Potentiometric
1
Titration
This standard is issued under the fixed designation D7318; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
NOTE—Subsection 11.2.1 was corrected and the yeardate changed on February 14, 2019.
Footnote 1 was corrected editorially in December 2019.
1. Scope* D4057 Practice for Manual Sampling of Petroleum and
Petroleum Products
1.1 This test method covers a potentiometric titration pro-
D4177 Practice for Automatic Sampling of Petroleum and
cedure for determining the existent inorganic sulfate content of
Petroleum Products
hydrous, anhydrous ethanol, and anhydrous denatured ethanol,
D6299 Practice for Applying Statistical Quality Assurance
which is added as a blending agent with spark ignition fuels. It
and Control Charting Techniques to Evaluate Analytical
is intended for the analysis of denatured ethanol samples
Measurement System Performance
containing between 1.0 mg⁄kg to 20 mg⁄kg existent inorganic
sulfate.
3. Terminology
1.2 The values stated in SI units are to be regarded as
3.1 Definitions:
standard. No other units of measurement are included in this
3.1.1 existent inorganic sulfate, n—inorganic sulfate species
standard.
actually present in the sample at the time of analysis with no
1.3 This standard does not purport to address all of the
oxidation treatment.
safety concerns, if any, associated with its use. It is the
3.1.1.1 Discussion—Specifically in this test method, inor-
responsibility of the user of this standard to establish appro-
ganic sulfate is present as sulfate in ethanol.
priate safety, health, and environmental practices and deter-
–2
3.1.2 inorganic sulfate, n—sulfate (SO ) species present
4
mine the applicability of regulatory limitations prior to use.
as sulfuric acid, ionic salts of this acid, or mixtures of these.
Material Safety Data Sheets are available for reagents and
materials. Review them for hazards prior to usage.
4. Summary of Test Method
1.4 This international standard was developed in accor-
4.1 An ethanol sample containing inorganic sulfate is
dance with internationally recognized principles on standard-
titrated in ethanolic medium with a standard lead nitrate
ization established in the Decision on Principles for the
solution. Lead sulfate precipitate is formed during the titration.
Development of International Standards, Guides and Recom-
Perchloric acid is added to remove possible interference from
mendations issued by the World Trade Organization Technical
carbonate. The endpoint is signaled by an increase in lead ion
Barriers to Trade (TBT) Committee.
activity, as measured by a lead-selective electrode.
2. Referenced Documents
2
5. Significance and Use
2.1 ASTM Standards:
D1193 Specification for Reagent Water
5.1 Ethanol is used as a blending agent added to gasoline.
D4052 Test Method for Density, Relative Density, and API
Sulfates are indicated in filter plugging deposits and fuel
Gravity of Liquids by Digital Density Meter
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 mea-
1
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of sured by this test method, can be used as one measure of
Subcommittee D02.03 on Elemental Analysis.
determination of the acceptability of ethanol for automotive
Current edition approved Feb. 14, 2019. Published February 2019. Originally
spark-ignition engine fuel use.
approved in 2007. Last previous edition approved in 2013 as D7318 – 13. DOI:
10.1520/D7318-19E01.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 6. Apparatus
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.1 Potentiometric Titration Assembly—A titration assem-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. bly consisting of an automatic titrator fitted with a lead
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
´1
D7318 − 19
ion-selective electrode, a double-junction reference
...

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1.1.1 This test method allows determination of the type(s) of asbestos fibers present.  
1.1.2 This test method cannot always discriminate between individual fibers of the asbestos and non-asbestos analogues of the same amphibole mineral.  
1.2 This test method is suitable for determination of asbestos in both ambient (outdoor) and building atmospheres.  
1.2.1 This test method is defined for polycarbonate capillary-pore filters or cellulose ester (either mixed esters of cellulose or cellulose nitrate) filters through which a known volume of air has been drawn and for blank filters.  
1.3 The upper range of concentrations that can be determined by this test method is 7000 s/mm2. The air concentration represented by this value is a function of the volume of air sampled.  
1.3.1 There is no lower limit to the dimensions of asbestos fibers that can be detected. In practice, microscopists vary in their ability to detect very small asbestos fibers. Therefore, a minimum length of 0.5 μm has been defined as the shortest fiber to be incorporated in the reported results.  
1.4 The direct analytical method cannot be used if the general particulate matter loading of the sample collection filter as analyzed exceeds approximately 10 % coverage of the collection filter by particulate matter.  
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.6 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 appropri...

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    English language
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