ASTM D3989-01(2012)
(Test Method)Standard Test Method for Total Rare Earth Metals in Paint Driers by EDTA Method
Standard Test Method for Total Rare Earth Metals in Paint Driers by EDTA Method
SIGNIFICANCE AND USE
4.1 This test method may be used to confirm the stated content of a pure, liquid rare earth metal drier manufactured for use in the coatings industry.
SCOPE
1.1 This test method covers the titrimetric determination of rare earth metals in liquid rare earth metal driers and utilizes the disodium salt of ethylenediaminetetraacetic acid dihydrate (EDTA).
1.2 This test method is limited to the determination of the rare earth metal content of a liquid rare earth metal drier that does not contain other drier elements. The method is not applicable to drier blends.
1.3 This test method has been tested in concentrations of 6 % cerium and 6 % rare earth metals, but there is no reason to believe that it is not suitable for higher or lower drier metal concentrations provided specimen size is adjusted accordingly.
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.5 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.
General Information
Relations
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D3989 − 01 (Reapproved 2012)
Standard Test Method for
Total Rare Earth Metals in Paint Driers by EDTA Method
This standard is issued under the fixed designation D3989; 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 3. Summary of Test Method
1.1 This test method covers the titrimetric determination of 3.1 A diluted solution of the drier is complexed with an
rare earth metals in liquid rare earth metal driers and utilizes excess of EDTA, the pH adjusted to 5.0, and then titrated with
zinc chloride solution to a xylenol orange end point.
the disodium salt of ethylenediaminetetraacetic acid dihydrate
(EDTA).
4. Significance and Use
1.2 This test method is limited to the determination of the
4.1 This test method may be used to confirm the stated
rare earth metal content of a liquid rare earth metal drier that
contentofapure,liquidrareearthmetaldriermanufacturedfor
does not contain other drier elements. The method is not
use in the coatings industry.
applicable to drier blends.
1.3 This test method has been tested in concentrations of
5. Interferences
6%ceriumand6%rareearthmetals,butthereisnoreasonto
5.1 Calcium does not interfere at low pH.
believe that it is not suitable for higher or lower drier metal
5.2 AllothercationsthatcanbetitratedwithEDTAinacidic
concentrations provided specimen size is adjusted accordingly.
media will interfere and must not be present in the drier.
1.4 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
6. Reagents
only.
6.1 Purity of Reagents—Reagent grade chemicals shall be
1.5 This standard does not purport to address all of the
used in all tests. Unless otherwise indicated, it is intended that
safety concerns, if any, associated with its use. It is the
all reagents shall conform to the specifications of the Commit-
responsibility of the user of this standard to establish appro-
tee onAnalytical Reagents of theAmerican Chemical Society,
priate safety and health practices and determine the applica-
where such specifications are available. Other grades may be
bility of regulatory limitations prior to use.
used, provided it is first ascertained that the reagent is of
sufficiently high purity to permit its use without lessening the
2. Referenced Documents
accuracy of the determination.
2.1 ASTM Standards:
6.2 Purity of Water—Unless otherwise indicated, reference
D600Specification for Liquid Paint Driers
towatershallbeunderstoodtomeanreagentwaterconforming
D1193Specification for Reagent Water
to Type II of Specification D1193.
E180Practice for Determining the Precision of ASTM
6.3 Ammonium Chloride—Ammonium Hydroxide Buffer
Methods for Analysis and Testing of Industrial and Spe-
Solution—Add 350 mL of concentrated ammonium hydroxide
cialty Chemicals (Withdrawn 2009)
(NH OH) to 54 g of ammonium chloride (NH Cl), and dilute
4 4
E300Practice for Sampling Industrial Chemicals
to 1 L with water.
6.4 Ammonium Hydroxide (NH OH), (1+1).
6.5 Ascorbic Acid.
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
6.6 Eriochrome Black T Indicator—Mix and grind thor-
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.
oughly in a mortar a mixture of 0.2 g of Eriochrome Black T
CurrenteditionapprovedJune1,2012.PublishedJuly2012.Originallyapproved
in 1981. Last previous edition approved in 2006 as D3989–01 (2006). DOI:
10.1520/D3989-01R12.
2 4
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Reagent Chemicals, American Chemical Society Specifications, American
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Chemical Society, Washington, DC. For suggestions on the testing of reagents not
Standards volume information, refer to the standard’s Document Summary page on listed by the American Chemical Society, see Analar Standards for Laboratory
the ASTM website. Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
The last approved version of this historical standard is referenced on and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
www.astm.org. MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D3989 − 01 (2012)
and 100 g of sodium chloride. Store the mixture in a tightly about 0.2 g of Eriochrome BlackTindicator mixture (Note 3).
stoppered bottle where it is stable indefinitely. Mix thoroughly by swirling. Titrate with the standard ZnCl
solution to the first permanent appearance of a red color.
6.7 EDTA, Standard Solution (0.01 M)—Weighabout3.73g
of disodium salt of ethylenediaminetetraacetic acid dihydrate
NOTE 3—If the end point is overstepped, add 1.0 mL of the EDTA
solutiontothemixtureandtitrateagainwithstandardZnCl solution.Use
to the nearest 0.01 g, dissolve in water, and dilute to approxi-
total volume of each solution for the calculation.
mately 1 L in a glass-stoppered bottle.
8.2.1 Calculate the molarity, M , of the EDTA solution as
6.8 Hydrochloric Acid (HCL), (1+1).
follows:
6.9 Isopropyl Alcohol (99.5%).
M 5 V M /V (2)
2 1 1 2
6.10 Sodium Acetate-Acetic Acid Buffer Solution—Dissolve
where:
82 g of sodium acetate in water and dilute to 1 L.Adjust pH to
V = volume of ZnCl solution, mL,
5.0 with glacial acetic acid using a pH meter.
1 2
M = molarity of ZnCl solution,
1 2
6.11 Xylenol Orange Indicator—Dissolve 0.2 g in 100 mL
V = volume of EDTA solution, mL, and
of water. Prepare fresh daily as required.
M = molarity of EDTA solution.
6.12 Zinc Chloride Solution, Standard (0.01 M)—Weigh
9. Procedure
about 0.65 g of zinc ribbon (Note 1) to the nearest 5 mg on a
glaz
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