ASTM D3341-05
(Test Method)Standard Test Method for Lead in Gasoline-Iodine Monochloride Method
Standard Test Method for Lead in Gasoline-Iodine Monochloride Method
SIGNIFICANCE AND USE
This test method determines the concentration of lead alkyl additives in gasoline. These additives improve the antiknock properties.
SCOPE
1.1 This test method determines total lead in gasolines containing lead alkyls at concentrations between 0.026 and 1.3 g Pb/L, and 0.12 and 6.0 g Pb/UK gal, 0.1 and 5.0 g Pb/US gal.
1.2 The preferred units are grams per litre although both gram per US gallon and grams per UK gallon are acceptable due to their widespread use in the industry.
1.3 This standard does not purport to address all of the safety problems, 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 Sections 6 and 8.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D3341–05
Standard Test Method for
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Lead in Gasoline—Iodine Monochloride Method
This standard is issued under the fixed designation D3341; 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* content of the buffered solution is determined by titration with
EDTA using xylenol orange as indicator.
1.1 This test method determines total lead in gasolines
containing lead alkyls at concentrations between 0.026 and 1.3
4. Significance and Use
gPb/L,and0.12and6.0gPb/UKgal,0.1and5.0gPb/USgal.
4.1 This test method determines the concentration of lead
1.2 The preferred units are grams per litre although both
alkyl additives in gasoline. These additives improve the anti-
gram per US gallon and grams per UK gallon are acceptable
knock properties.
due to their widespread use in the industry.
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 Separatory Funnel, borosilicate glass, capacity 250 mL,
responsibility of the user of this standard to establish appro-
glass-stoppered with preferably an iodine flask type of neck.
priate safety and health practices and determine the applica-
5.2 Erlenmeyer Flask, borosilicate glass, capacity 500 mL.
bility of regulatory limitations prior to use. For specific hazard
statements, see Sections 6 and 8.
6. Reagents and Materials
6.1 Purity of Reagents—Reagent grade chemicals shall be
2. Referenced Documents
2 used in all tests. Unless otherwise indicated, it is intended that
2.1 ASTM Standards:
all reagents shall conform to the specifications of the Commit-
D1193 Specification for Reagent Water
tee onAnalytical Reagents of theAmerican Chemical Society,
D4057 Practice for Manual Sampling of Petroleum and
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where such specifications are available. Other grades may be
Petroleum Products
used, provided it is first ascertained that the reagent is of
D6299 Practice for Applying Statistical Quality Assurance
sufficiently high purity to permit its use without lessening the
and Control Charting Techniques to Evaluate Analytical
accuracy of the determination.
Measurement System Performance
6.1.1 Commercially available reagents may be used in place
of laboratory preparations when they conform to the specifi-
3. Summary of Test Method
cations in 6.1.
3.1 A known volume of the sample is diluted with heavy
6.2 Purity of Water—Unless otherwise indicated, references
distillate and shaken with aqueous iodine monochloride re-
to water shall be understood to mean reagent water as defined
agent. Any tetraalkyl lead compounds present react with the
by Type III or Type IV of Specification D1193.
iodine monochloride and are extracted into the aqueous phase
6.3 Ammonia Solution (1 + 1)—Mix 1 volume of concen-
as the dialkyl lead compounds. The aqueous extract is sepa-
trated ammonia solution (rel dens 0.90) with 1 volume of
rated from the gasoline and evaporated to low bulk to decom-
distilled water.
pose free iodine monochloride. Any organic matter present is
6.4 Bromthymol Blue Indicator Solution—Dissolve0.1gof
removed by oxidation with nitric acid, which also serves to
bromthymol blue in 50 mL of ethanol and dilute to 100 mL
convert the dialkyl lead compounds into inorganic lead com-
with distilled water.
pounds.The residue is dissolved in distilled water and buffered
6.5 EDTA, Standard Solution (0.005 M)—Dissolve approxi-
to pH 5 using sodium acetate-acetic acid buffer. The lead
mately 3.75 g of diaminoethanetetra-acetic acid, disodium salt,
in 2-Lof distilled water. Determine the molarity of the solution
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This test method is under the jurisdiction of ASTM Committee D02 on by standardization with lead nitrate solution as follows:
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
D02.03 on Elemental Analysis.
Current edition approved May 1, 2005. Published May 2005. Originally
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approved in 1974. Last previous edition approved in 2000 as D3341–00. DOI: Reagent Chemicals, American Chemical Society Specifications, American
10.1520/D3341-05. Chemical Society, Washington, DC. For suggestions on the testing of reagents not
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or listed by the American Chemical Society, see Analar Standards for Laboratory
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
Standards volume information, refer to the standard’s Document Summary page on and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
the AST
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