ASTM D3231-07
(Test Method)Standard Test Method for Phosphorus in Gasoline
Standard Test Method for Phosphorus in Gasoline
SIGNIFICANCE AND USE
Phosphorus in gasoline will damage catalytic convertors used in automotive emission control systems, and its level therefore is kept low.
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 stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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 warning statements, see Section 6 and 9.5.
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Standards Content (Sample)
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Designation:D3231–07
Standard Test Method for
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Phosphorus in Gasoline
This standard is issued under the fixed designation D3231; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope* sulfuric acid and reacted with ammonium molybdate and
hydrazine sulfate. The absorbance of the Molybdenum Blue
1.1 This test method covers the determination of phospho-
complex is proportional to the phosphorus concentration in the
rus generally present as pentavalent phosphate esters or salts,
sample and is read at approximately 820 nm in a 5-cm cell.
or both, in gasoline. This test method is applicable for the
determination of phosphorus in the range from 0.2 to 40 mg
4. Significance and Use
P/litre or 0.0008 to 0.15 g P/U.S. gal.
4.1 Phosphorus in gasoline will damage catalytic convertors
1.2 The values stated in SI units are to be regarded as
used in automotive emission control systems, and its level
standard. The values given in parentheses are for information
therefore is kept low.
only.
1.3 This standard does not purport to address all of the
5. Apparatus
safety concerns, if any, associated with its use. It is the
5.1 Buret, 10-mL capacity, 0.05-mL subdivisions.
responsibility of the user of this standard to establish appro-
5.2 Constant-Temperature Bath, equipped to hold several
priate safety and health practices and determine the applica-
100-mL volumetric flasks submerged to the mark. Bath must
bility of regulatory limitations prior to use. For specific
have a large enough reservoir or heat capacity to keep the
warning statements, see Section 6 and 9.5.
temperature at 82.2 to 87.8°C (180 to 190°F) during the entire
2. Referenced Documents period of sample heating.
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2.1 ASTM Standards:
NOTE 1—If the temperature of the hot water bath drops below 82.2°C
D1193 Specification for Reagent Water (180°F), the color development cannot be complete.
D4057 Practice for Manual Sampling of Petroleum and
5.3 Cooling Bath, equipped to hold several 100-mL volu-
Petroleum Products
metric flasks submerged to the mark in ice water.
D6299 Practice for Applying Statistical Quality Assurance
5.4 Filter Paper, for quantitative analysis, Class G for fine
and Control Charting Techniques to Evaluate Analytical
precipitates as defined in Specification E832.
Measurement System Performance
5.5 Ignition Dish—Coors porcelain evaporating dish,
E832 Specification for Laboratory Filter Papers
glazed inside and outside, with pourout (Size No. 00A,
diameter 75 mm, capacity 70 mL).
3. Summary of Test Method
5.6 Spectrophotometer, equipped with a tungsten lamp, a
3.1 Organic matter in the sample is decomposed by ignition
red-sensitive phototube capable of operating at 830 nm and
in the presence of zinc oxide. The residue is dissolved in
with absorption cells that have a 5-cm light path.
5.7 Thermometer, ASTM 34C or 34F, range from 25 to
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105°C (77 to 221°F).
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
5.8 Volumetric Flask, 100-mL with ground-glass stopper.
D02.03 on Elemental Analysis.
5.9 Volumetric Flask, 1000-mL with ground-glass stopper.
Current edition approved May 1, 2007. Published June 2007. Originally
5.10 Syringe, Luer-Lok, 10-mL equipped with 5-cm, 22-
approved in 1973. Last previous edition approved in 2002 as D3231–02. DOI:
gauge needle.
10.1520/D3231-07.
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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
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
*A Summary of Changes section appears at the end of this standard.
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D3231–07
6. Reagents slowly, with continuous stirring, 100 mL of H SO (relative
2 4
density 1.84) to 1 L of water contained in a beaker placed in a
6.1 Purity of Reagents—Reagent grade chemicals shall be
bath of cold water.
used in all tests. Unless otherwise indicated, it is intended that
6.9 Zinc Oxide—(Warning—See 6.8.) (Warning—High-
all reagents shall conform to the specifications of the Commit-
bulk density zinc oxide can cause spattering. Density of
tee onAnalytical Reagents of theAmerican Chemical Society,
3
3
approximately 0.5 g/cm has been found satisfactory.)
where such specifications are available. Other grades
...
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