ASTM D3231-99
(Test Method)Standard Test Method for Phosphorus in Gasoline
Standard Test Method for Phosphorus in Gasoline
SCOPE
1.1 This test method covers the determination of phosphorus generally present as pentavalent phosphate esters or salts, or both, in gasoline. This test method is applicable for the determination of phosphorus in the range from 0.2 to 40 mg P/litre or 0.0008 to 0.15 g P/U.S. gal.
1.2 The values given in acceptable 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. For specific hazard statements, see 6.3, 6.4, Notes 2, 3, 4, 5, 7, and 11.
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Standards Content (Sample)
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
An American National Standard
Designation: D 3231 – 99
Standard Test Method for
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Phosphorus in Gasoline
This standard is issued under the fixed designation D 3231; 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 (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope hydrazine sulfate. The absorbance of the Molybdenum Blue
complex is proportional to the phosphorus concentration in the
1.1 This test method covers the determination of phospho-
sample and is read at approximately 820 nm in a 5-cm cell.
rus generally present as pentavalent phosphate esters or salts,
or both, in gasoline. This test method is applicable for the
4. Significance and Use
determination of phosphorus in the range from 0.2 to 40 mg
4.1 Phosphorus in gasoline will damage catalytic convertors
P/litre or 0.0008 to 0.15 g P/U.S. gal.
used in automotive emission control systems, and its level
1.2 The values given in acceptable SI units are to be
therefore is kept low.
regarded as the standard. The values given in parentheses are
for information only.
5. Apparatus
1.3 This standard does not purport to address all of the
5.1 Buret, 10-mL capacity, 0.05-mL subdivisions.
safety concerns, if any, associated with its use. It is the
5.2 Constant-Temperature Bath, equipped to hold several
responsibility of the user of this standard to establish appro-
100-mL volumetric flasks submerged to the mark. Bath must
priate safety and health practices and determine the applica-
have a large enough reservoir or heat capacity to keep the
bility of regulatory limitations prior to use. For specific hazard
temperature at 82.2 to 87.8°C (180 to 190°F) during the entire
statements, see 6.3, 6.4, Notes 2-5, Note 7 and Note 11.
period of sample heating.
2. Referenced Documents
NOTE 1—If the temperature of the hot water bath drops below 82.2°C
2.1 ASTM Standards: (180°F), the color development cannot be complete.
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D 1193 Specification for Reagent Water
5.3 Cooling Bath, equipped to hold several 100-mL volu-
D 4057 Practice for Manual Sampling of Petroleum and
metric flasks submerged to the mark in ice water.
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Petroleum Products
5.4 Filter Paper, for quantitative analysis, Class G for fine
D 6299 Practice for Applying Statistical Quality Assurance
precipitates as defined in Specification E 832.
Techniques to Evaluate Analytical Measurement System
5.5 Ignition Dish— Coors porcelain evaporating dish,
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Performance
glazed inside and outside, with pourout (Size No. 00A,
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E 832 Specification for Laboratory Filter Papers
diameter 75 mm, capacity 70 mL).
5.6 Spectrophotometer, equipped with a tungsten lamp, a
3. Summary of Test Method
red-sensitive phototube capable of operating at 830 nm and
3.1 Organic matter in the sample is decomposed by ignition
with absorption cells that have a 5-cm light path.
in the presence of zinc oxide. The residue is dissolved in
5.7 Thermometer, ASTM 34C or 34F, range from 25 to
sulfuric acid and reacted with ammonium molybdate and
105°C (77 to 221°F).
5.8 Volumetric Flask, 100-mL with ground-glass stopper.
5.9 Volumetric Flask, 1000-mL with ground-glass stopper.
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This test method is under the jurisdiction of ASTM Committee D-2 on
5.10 Syringe, Luer-Lok, 10-mL equipped with 5-cm, 22-
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
D02.03 on Elemental Analysis.
gage needle.
Current edition approved Apr. 10, 1999. Published June 1999. Originally
published as D 3231 – 73. Last previous edition D 3231 – 94.
2
Annual Book of ASTM Standards, Vol 11.01.
3
Annual Book of ASTM Standards, Vol 05.02.
4
Annual Book of ASTM Standards, Vol 05.03.
5
Annual Book of ASTM Standards, Vol 14.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
D3231–99
6. Reagents with continuous stirring, 100 mL of H SO (relative density
2 4
1.84) to 1 L of water contained in a beaker placed in a bath of
6.1 Purity of Reagents—Reagent grade chemicals shall be
cold water.
used in all tests. Unless otherwise indicated, it is intended that
6.9 Zinc Oxide.
all reagents shall conform to the specifications of the Commit-
tee on Analytical Reagents of the American Chemical Society,
NOTE 7—Warning: Concentrated sulfuric acid causes severe burns.
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where such specifications are available. Other grades may be Strong oxidiz
...
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