Standard Test Method for
Phosphorus in Gasoline1
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.
1.1 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 Section 6 and 9.5.
2. Referenced Documents
2.1 ASTM Standards:
D 1193 Specification for Reagent Water2
D 4057 Practice for Manual Sampling of Petroleum and
D 6299 Practice for Applying Statistical Quality Assurance
Techniques to Evaluate Analytical Measurement System
E 832 Specification for Laboratory Filter Papers5
3. Summary of Test Method
3.1 Organic matter in the sample is decomposed by ignition
in the presence of zinc oxide. The residue is dissolved in
sulfuric acid and reacted with ammonium molybdate and
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