ASTM D7328-07e1

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D7328–07
Standard Test Method for
Determination of Total and Potential Inorganic Sulfate and
Total Inorganic Chloride in Fuel Ethanol by Ion
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Chromatography Using Aqueous Sample Injection
This standard is issued under the fixed designation D7328; 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.
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´ NOTE—Added standards previously under development to the Referenced Documents and 4.2 editorially in April 2007.
1. Scope D6299 Practice for Applying Statistical Quality Assurance
and Control Charting Techniques to Evaluate Analytical
1.1 This test method covers an ion chromatographic proce-
Measurement System Performance
dure for the determination of the total and potential inorganic
D6792 Practice for Quality System in Petroleum Products
sulfate and total inorganic chloride content in hydrous and
and Lubricants Testing Laboratories
anhydrous denatured ethanol to be used in motor fuel applica-
D7318 Test Method for Total Inorganic Sulfate in Ethanol
tions. It is intended for the analysis of ethanol samples
by Potentiometric Titration
containing between 0.55 and 20 mg/kg of total inorganic
D7319 Test Method for Determination of Total and Poten-
sulfate, 4.0 to 20 mg/kg of potential inorganic sulfate, and 0.75
tial Sulfate and Inorganic Chloride in Fuel Ethanol by
to 50 mg/kg of total inorganic chloride.
Direct Injection Suppressed Ion Chromatography
1.2 The values stated in SI units are to be regarded as
2.2 Other Standard:
standard. No other units of measurement are included in this
ISO/CEN15492 Ethanol as a Blending Component for Pet-
standard.
rol – Determination of Inorganic Chloride – Ion Chro-
1.3 This standard does not purport to address all of the
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matographic 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 inorganic chloride, n—chloride present as hydrochlo-
Data Sheets are available for reagents and materials. Review
ric acid, ionic salts of this acid, or mixtures of these.
them for hazards prior to usage.
3.1.2 inorganic sulfate, n—sulfate species present as sulfu-
2. Referenced Documents ric acid, ionic salts of this acid, or mixtures of these.
2 3.1.3 potential sulfate, n—total sulfur species present in the
2.1 ASTM Standards:
samplethatcanbeoxidizedtoinorganicsulfateinthepresence
D1193 Specification for Reagent Water
of an oxidizing agent.
D4052 Test Method for Density, Relative Density, and API
3.1.4 total sulfate, n—inorganic sulfate species actually
Gravity of Liquids by Digital Density Meter
present in the sample at the time of analysis with no oxidation
D4057 Practice for Manual Sampling of Petroleum and
treatment.
Petroleum Products
D4177 Practice for Automatic Sampling of Petroleum and
4. Summary of Test Method
Petroleum Products
4.1 For total inorganic sulfate and chloride, a small volume
D5827 Test Method for Analysis of Engine Coolant for
of a sample is evaporated to dryness and reconstituted to the
Chloride and Other Anions by Ion Chromatography
initial sample volume with deionized water, and injected into
an ion chromatograph consisting of appropriate ion exchange
1 columns, suppressor and a conductivity detector. For potential
This test method is under the jurisdiction of ASTM Committee D02 on
sulfate, a small volume of a sample is evaporated to dryness
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
D02.03 on Elemental Analysis.
and reconstituted to the initial sample volume with 0.90 %
Current edition approved Jan. 1, 2007. Published February 2007. DOI: 10.1520/
hydrogen peroxide solution in water, and injected into an ion
D7328-07E01.
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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
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Standards volume information, refer to the standard’s Document Summary page on Available from International Organization for Standardization (ISO), 1 rue de
the ASTM website. Varembé, Case postale 56, CH-1211, Geneva 20, Switzerland, http://www.iso.ch.
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D7328–07
FIG. 1 Typical Ion Chromatogram of a Solution Containing 1 mg/kg of Various Anions in Water
chromatograph. Ions are separated based on the
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