ASTM D7319-11

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Designation:D7319–11
Standard Test Method for
Determination of Existent and Potential Sulfate and
Inorganic Chloride in Fuel Ethanol by Direct Injection
1
Suppressed Ion Chromatography
This standard is issued under the fixed designation D7319; 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.
1. Scope* Measurement System Performance
D6792 Practice for Quality System in Petroleum Products
1.1 This test method covers a direct injection ion chromato-
and Lubricants Testing Laboratories
graphic procedure for determining existent and potential inor-
D7318 Test Method for Existent Inorganic Sulfate in Etha-
ganic sulfate and total inorganic chloride content in hydrous
nol by Potentiometric Titration
and anhydrous denatured ethanol to be used in motor fuel
D7328 Test Method for Determination of Existent and
applications. It is intended for the analysis of ethanol samples
Potential Inorganic Sulfate andTotal Inorganic Chloride in
containing between 1.0–20 mg/kg of existent or potential
Fuel Ethanol by Ion Chromatography Using Aqueous
inorganic sulfate and 1.0–50 mg/kg of inorganic chloride.
Sample Injection
1.2 The values stated in SI units are to be regarded as
3
2.2 European Norm Standards:
standard. No other units of measurement are included in this
EN 15492 Ethanol as a blending component for petrol -
standard.
Determination of inorganic chloride and sulfate content -
1.3 This standard does not purport to address all of the
Ion chromatographic method
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
3. Terminology
priate safety and health practices and determine the applica-
3.1 Definitions of Terms Specific to This Standard:
bility of regulatory limitations prior to use. Material Safety
3.1.1 existentinorganicsulfate,n—inorganicsulfatespecies
Data Sheets are available for reagents and materials. Review
actually present in the sample at the time of analysis with no
them for hazards prior to usage.
oxidation treatment.
2. Referenced Documents 3.1.2 inorganic chloride, n—chloride present as hydrochlo-
2
ric acid, ionic salts of this acid, or mixtures of these.
2.1 ASTM Standards:
-2
3.1.3 inorganic sulfate, n—sulfate (SO ) species present
D1193 Specification for Reagent Water 4
as sulfuric acid, ionic salts of this acid, or mixtures of these.
D4052 Test Method for Density, Relative Density, and API
3.1.4 potential sulfate, n—inorganic sulfate species present
Gravity of Liquids by Digital Density Meter
after the sample has been reacted with an oxidizing agent.
D4057 Practice for Manual Sampling of Petroleum and
Petroleum Products
4. Summary of Test Method
D4177 Practice for Automatic Sampling of Petroleum and
4.1 For existent inorganic sulfate and total chloride, a small
Petroleum Products
volume of an ethanol sample is directly injected into a suitably
D5827 Test Method for Analysis of Engine Coolant for
configured ion chromatograph in accordance with manufactur-
Chloride and Other Anions by Ion Chromatography
er’s recommendations for this test method. For potential
D6299 Practice for Applying Statistical Quality Assurance
sulfate, 0.5 mLof 30 % hydrogen peroxide solution is added to
and Control Charting Techniques to Evaluate Analytical
9.5 mL of the ethanol sample, and then injected into the ion
chromatograph. Ions are separated based on their affinity for
exchangesitesoftheresinwithrespecttotheresin’saffinityfor
1
This test method is under the jurisdiction of ASTM Committee D02 on
the eluent. The suppressor increases the sensitivity of the test
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
D02.03 on Elemental Analysis.
method by both increasing the conductivity of the analytes and
Current edition approved July 1, 2011. Published August 2011. Originally
decreasing the conductivity of the eluent. It also converts the
approved in 2007. Last previous edition approved in 2009 as D7319–09. DOI:
eluent and analytes to the corresponding hydrogen forms of
10.1520/D7319-11.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 4th Floor, New York, NY 10036, http://www.ansi.org.
*A Summary of Changes section appears at the end of this standard.
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