ASTM D3970-05

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D3970–05
Standard Test Method for
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Cerium in Paint Driers by Oxidimetric Determination
This standard is issued under the fixed designation D3970; 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 4. Significance and Use
1.1 This test method covers the titrimetric determination of 4.1 This test method may be used to confirm in the presence
cerium in liquid cerium and rare earth paint driers and utilizes ofrareearthsthestatedceriumcontentofliquidpureceriumor
ferrous ammonium sulfate. rare earth driers manufactured for use in the coatings industry.
1.2 This test method is not applicable to dryer blends.
5. Interferences
1.3 The values stated in SI units are to be regarded as the
5.1 Thistestmethodisspecificforceriuminthepresenceof
standard. The values given in parentheses are for information
only. rare earth metals. Other drier metals with more than one
valence may interfere and should be absent.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
6. Reagents
responsibility of the user of this standard to establish appro-
6.1 Purity of Reagents—Reagent grade chemicals shall be
priate safety and health practices and determine the applica-
used in all tests. Unless otherwise indicated, it is intended that
bility of regulatory limitations prior to use. For a specific
all reagents purchased or prepared shall conform to the
hazard statement, see Section 7.
specifications of the Committee on Analytical Reagents of the
2. Referenced Documents
American Chemical Society, where such specifications are
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2.1 ASTM Standards: available . Other grades may be used, provided it is first
ascertained that the reagent is of sufficiently high purity to
D444 Test Methods for Chemical Analysis of Zinc Yellow
Pigment (Zinc Chromate Yellow) permit its use without lessening the accuracy of the determi-
nation.
D600 Specification for Liquid Paint Driers
D1193 Specification for Reagent Water 6.2 Purity of Water—Unless otherwise indicated, references
E180 Practice for Determining the Precision of ASTM towatershallbeunderstoodtomeanreagentwaterconforming
to Type II of Specification D1193.
Methods for Analysis and Testing of Industrial and Spe-
cialty Chemicals 6.3 Ceric Sulfate Solution, Standard (0.1 N)—Standardized
0.1 N solutions of ceric sulfate (Ce(SO ))in1 N sulfuric acid
E300 Practice for Sampling Industrial Chemicals
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may be purchased or prepared.
3. Summary of Test Method
6.4 Ferroin Indicator (0.025 M)—Orthophenanthrolinefer-
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3.1 Theorganicconstituentsoftheliquiddrierspecimenare rous complex indicator.
eliminated by treatment with nitric, sulfuric, and hydrochloric
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acids,andtheceriumisconvertedtoceroussulfate.Thecerous
Reagent Chemicals, American Chemical Society Specifications, American
sulfate is oxidized to ceric sulfate with sodium bismuthate and Chemical Society, Washington, DC. For suggestions on the testing of reagents not
listed by the American Chemical Society, see Analar Standards for Laboratory
titrated with standard ferrous ammonium sulfate.
Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
MD.
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This test method is under the jurisdiction of ASTM Committee D01 on Paint The sole source of supply of reagent grade 0.1 N solution of ceric sulfate in 1
and Related Coatings, Materials, andApplications and is the direct responsibility of Nsulfuricacid,knowntothecommitteeatthistimeisG.FrederickSmithCo.Ifyou
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials. are aware of alternative suppliers, please provide this information to ASTM
Current edition approved Jan. 1, 2005. Published February 2005. Originally International Headquarters. Your comments will receive careful consideration at a
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approved in 1980. Last previous editions approved in 1999 as D3970 – 80 (1999). meeting of the responsible technical committee, which you may attend.
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DOI: 10.1520/D3970-05. Thesolesourceofsupplyof0.025 Mferroinindicator,knowntothecommittee
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or at this time is G. Frederick Smith Co. If you are aware of alternative suppliers,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM please provide this information to ASTM International Headquarters. Your com-
Standards volume information, refer to the standard’s Document Summary page on
ments will receive careful consideration at a meeting of the responsible technical
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the ASTM website.
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