ASTM D3970-05(2011)
(Test Method)Standard Test Method for Cerium in Paint Driers by Oxidimetric Determination
Standard Test Method for Cerium in Paint Driers by Oxidimetric Determination
SIGNIFICANCE AND USE
This test method may be used to confirm in the presence of rare earths the stated cerium content of liquid pure cerium or rare earth driers manufactured for use in the coatings industry.
SCOPE
1.1 This test method covers the titrimetric determination of cerium in liquid cerium and rare earth paint driers and utilizes ferrous ammonium sulfate.
1.2 This test method is not applicable to dryer blends.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 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 a specific hazard statement, see Section 7.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D3970 − 05 (Reapproved 2011)
Standard Test Method for
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.Anumber 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 Thistestmethodmaybeusedtoconfirminthepresence
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
rare earth metals. Other drier metals with more than one
only.
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 onAnalytical Reagents of the
American Chemical Society, where such specifications are
2. Referenced Documents
available. Other grades may be used, provided it is first
2.1 ASTM Standards:
ascertained that the reagent is of sufficiently high purity to
D444Test Methods for Chemical Analysis of Zinc Yellow
permit its use without lessening the accuracy of the determi-
Pigment (Zinc Chromate Yellow)
nation.
D600Specification for Liquid Paint Driers
6.2 Purity of Water—Unless otherwise indicated, references
D1193Specification for Reagent Water
towatershallbeunderstoodtomeanreagentwaterconforming
E180Practice for Determining the Precision of ASTM
to Type II of Specification D1193.
Methods for Analysis and Testing of Industrial and Spe-
cialty Chemicals (Withdrawn 2009)
6.3 Ceric Sulfate Solution, Standard (0.1 N)—Standardized
E300Practice for Sampling Industrial Chemicals
0.1 N solutions of ceric sulfate (Ce(SO ))in1 N sulfuric acid
4 2
may be purchased or prepared.
3. Summary of Test Method
6.4 Ferroin Indicator (0.025 M)—Orthophenanthroline fer-
3.1 Theorganicconstituentsoftheliquiddrierspecimenare 6
rous complex indicator.
eliminated by treatment with nitric, sulfuric, and hydrochloric
acids,andtheceriumisconvertedtoceroussulfate.Thecerous
sulfate is oxidized to ceric sulfate with sodium bismuthate and 4
Reagent Chemicals, American Chemical Society Specifications, American
Chemical Society, Washington, DC. For suggestions on the testing of reagents not
titrated with standard ferrous ammonium sulfate.
listed by the American Chemical Society, see Analar Standards for Laboratory
Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
This test method is under the jurisdiction of ASTM Committee D01 on Paint and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
andRelatedCoatings,Materials,andApplicationsandisthedirectresponsibilityof MD.
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials. The sole source of supply of reagent grade 0.1 N solution of ceric sulfate in 1
Current edition approved June 1, 2011. Published June 2011. Originally Nsulfuricacid,knowntothecommitteeatthistimeisG.FrederickSmithCo.Ifyou
approved in 1980. Last previous edition approved in 2005 as D3970–05. DOI: are aware of alternative suppliers, please provide this information to ASTM
10.1520/D3970-05R11. International Headquarters. Your comments will receive careful consideration at a
For referenced ASTM standards, visit the ASTM website, www.astm.org, or meeting of the responsible technical committee, which you may attend.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Thesolesourceofsupplyof0.025 Mferroinindicator,knowntothecommittee
Standards volume information, refer to the standard’s Document Summary page on at this time is G. Frederick Smith Co. If you are aware of alternative suppliers,
the ASTM website. please provide this information to ASTM International Headquarters. Your com-
The last approved version of this historical standard is referenced on ments will receive careful consideration at a meeting of the responsible technical
www.astm.org. committee, which you may attend.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D3970 − 05 (2011)
samples from tanks are required to confirm that separation has not
6.5 Ferrous Ammonium Sulfate Solution, Standard (0.1
occurred.Agitate drums in accordance with theTube Sampling section of
M)—Standardized ferrous ammonium sulfate (FeSO ·
Practice E300.
(NH ) SO ), 0.1 M, may be purchased or prepared in the
4 2 4
8.2 Examine the sample of drier for sediment or suspended
following manner. Dissolve 39.2 g of ferrous ammonium
matterwhich,ifpresent,isevidenceofnoncompliancewiththe
sulfate in 250 mL of distilled water and add 20 mL of
Physical Appearance requirements section of Specification
concentrated sulfuric acid with stirring. Dilute to 1 L in a
D600.
volumetric flask and standardize as follows:
6.5.1 Pipet duplicate 20.0-mL portions of standard 0.1 N
8.3 If the sample is homogeneous keep it in a stoppered
ceric sulfate solution into 400-mLbeakers and add 200-mLof
vessel to prevent solvent evaporation prior to analysis.
1.5 N sulfuric acid. Titrate with 0.1 N ferrous ammonium
9. Procedure
sulfate solution as described in 9.9. Calculate the molarity, M,
of this approximately 0.1 M solution as follows:
9.1 Fortheanalysisuse1.0gfor6%ofceriumand2.0gor
more for materials containing proportionally less cerium. Rare
M 5 V N/V (1)
2 1
earth driers are generally 45 to 50% cerium. Thus in the
where:
analysis of 6% rare earth driers, containing cerium, use 2.0 g.
Weigh the specimen from a weighing bottle or syringe by
V = ceric sulfate solution, mL,
differen
...
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