ASTM D3989-01

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D3989–01
Standard Test Method for
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Total Rare Earth Metals in Paint Driers by EDTA Method
This standard is issued under the fixed designation D 3989; 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.
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 the stated
rare earth metals in liquid rare earth metal driers and utilizes contentofapure,liquidrareearthmetaldriermanufacturedfor
the disodium salt of ethylenediaminetetraacetic acid dihydrate use in the coatings industry.
(EDTA).
5. Interferences
1.2 This test method is limited to the determination of the
5.1 Calcium does not interfere at low pH.
rare earth metal content of a liquid rare earth metal drier that
does not contain other drier elements. The method is not 5.2 AllothercationsthatcanbetitratedwithEDTAinacidic
media will interfere and must not be present in the drier.
applicable to drier blends.
1.3 This test method has been tested in concentrations of
6. Reagents
6 % cerium and 6 % rare earth metals, but there is no reason to
6.1 Purity of Reagents—Reagent grade chemicals shall be
believe that it is not suitable for higher or lower drier metal
used in all tests. Unless otherwise indicated, it is intended that
concentrations provided specimen size is adjusted accordingly.
all reagents shall conform to the specifications of the Commit-
1.4 This standard does not purport to address all of the
tee onAnalytical Reagents of theAmerican Chemical Society,
safety concerns, if any, associated with its use. It is the
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where such specifications are available. Other grades may be
responsibility of the user of this standard to establish appro-
used, provided it is first ascertained that the reagent is of
priate safety and health practices and determine the applica-
sufficiently high purity to permit its use without lessening the
bility of regulatory limitations prior to use.
accuracy of the determination.
2. Referenced Documents
6.2 Purity of Water—Unless otherwise indicated, reference
2.1 ASTM Standards: to water shall be understood to mean reagent water conforming
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D 600 Specification for Liquid Paint Driers to Type II of Specification D 1193.
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6.3 Ammonium Chloride—Ammonium Hydroxide Buffer
D 1193 Specification for Reagent Water
E 180 Practice for Determining the Precision of ASTM Solution—Add 350 mL of concentrated ammonium hydroxide
(NH OH) to 54 g of ammonium chloride (NH Cl), and dilute
Methods for Analysis and Testing of Industrial and Spe-
4 4
4
cialty Chemicals to 1 L with water.
6.4 Ammonium Hydroxide (NH OH), (1+1).
E 300 Practice for Sampling Industrial and Specialty
4
4
Chemicals 6.5 Ascorbic Acid.
6.6 Eriochrome Black T Indicator—Mix and grind thor-
3. Summary of Test Method
oughly in a mortar a mixture of 0.2 g of Eriochrome Black T
3.1 A diluted solution of the drier is complexed with an and 100 g of sodium chloride. Store the mixture in a tightly
excess of EDTA, the pH adjusted to 5.0, and then titrated with stoppered bottle where it is stable indefinitely.
zinc chloride solution to a xylenol orange end point.
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This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
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Subcommittee D01.21 on Chemical Analysis of Paint and Paint Materials. Reagent Chemicals, American Chemical Society Specifications, American
Current edition approved Jan. 10, 2001. Published April 2001. Originally Chemical Society, Washington, DC. For suggestions on the testing of reagents not
e1
published as D 3989 – 81. Last previous edition D 3989 – 81a (1994) . listed by the American Chemical Society, see Analar Standards for Laboratory
2
Annual Book of ASTM Standards, Vol 06.04. Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
3
Annual Book of ASTM Standards, Vol 11.01. and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
4
Annual Book of ASTM Standards, Vol 15.05. MD.
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D3989
M 5 V M /V (2)
6.7 EDTA, Standard Solution (0.01 M)—Weigh about 3.73
2 1 1 2
g of disodium salt of ethylenediaminetetraacetic acid dihydrate
where:
to the nearest 0.01 g, dissolve in water, and dilute to approxi-
V = volume of ZnCl solution, mL,
1 2
mately 1 L in a glass-stoppered bottle.
M = molarity of ZnCl solution,
1 2
6.8 Hydrochloric Acid (HCL), (1+1).
V = volume of EDTA so
...