ASTM D2373-05

Standard Test Method for Determination of Cobalt in Paint Driers by EDTA Method

SIGNIFICANCE AND USE
The amount of cobalt drier used in oxidizing-type coatings significantly affects their drying properties. This test method may be used to confirm the stated cobalt content of a pure liquid cobalt drier soluble in glacial acetic acid and manufactured for use by the coatings industry.
SCOPE
1.1 This test method covers a titrimetric determination of cobalt in liquid paint driers that can be dissolved in glacial acetic acid and utilizes the disodium salt of ethylenediaminetetraacetic acid dihydrate (EDTA).
1.2 This test method is not applicable to drier blends. If driers other than cobalt are present, they may interfere by reacting with EDTA under the conditions used for analysis.
1.3 All cations that can be titrated with EDTA in alkaline media interfere and must not be present in the sample.
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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

• Status: Historical
• Publication Date: 31-Dec-2004
• ICS: 87.060.99 - Other paint ingredients
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.21 - Chemical Analysis of Paints and Paint Materials

Relations

• Replaces: ASTM D2373-85(1999) - Standard Test Method for Determination of Cobalt in Paint Driers by EDTA Method
• Effective Date: 01-Jan-2005
• Replaced By: ASTM D2373-05(2011) - Standard Test Method for Determination of Cobalt in Paint Driers by EDTA Method (Withdrawn 2016)
• Effective Date: 01-Jun-2011
• Referred By: ASTM D564-87(2023) - Standard Test Methods for Liquid Paint Driers
• Effective Date: 01-Jan-2005

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D2373–05
Standard Test Method for
1
Determination of Cobalt in Paint Driers by EDTA Method
This standard is issued under the fixed designation D2373; 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 excess of standard EDTA solution. The excess is titrated with
standard cupric sulfate solution using PAN as the metal
1.1 This test method covers a titrimetric determination of
indicator.
cobalt in liquid paint driers that can be dissolved in glacial
aceticacidandutilizesthedisodiumsaltofethylenediaminetet-
4. Significance and Use
raacetic acid dihydrate (EDTA).
4.1 The amount of cobalt drier used in oxidizing-type
1.2 This test method is not applicable to drier blends. If
coatings significantly affects their drying properties. This test
driers other than cobalt are present, they may interfere by
method may be used to confirm the stated cobalt content of a
reacting with EDTA under the conditions used for analysis.
pure liquid cobalt drier soluble in glacial acetic acid and
1.3 All cations that can be titrated with EDTA in alkaline
manufactured for use by the coatings industry.
media interfere and must not be present in the sample.
1.4 The values stated in SI units are to be regarded as the
5. Apparatus
standard. The values given in parentheses are for information
5.1 Centrifuge, capable of developing 1000 to 2000 g.
only.
1.5 This standard does not purport to address all of the
6. Reagents
safety concerns, if any, associated with its use. It is the
6.1 Purity of Reagents—Reagent grade chemicals shall be
responsibility of the user of this standard to establish appro-
used in all tests. Unless otherwise indicated, it is intended that
priate safety and health practices and determine the applica-
all reagents shall conform to the specifications of the Commit-
bility of regulatory limitations prior to use.
tee onAnalytical Reagents of theAmerican Chemical Society,
3
where such specifications are available. Other grades may be
2. Referenced Documents
2 used, provided it is first ascertained that the reagent is of
2.1 ASTM Standards:
sufficiently high purity to permit its use without lessening the
D600 Specification for Liquid Paint Driers
accuracy of the determination.
D1193 Specification for Reagent Water
6.2 Purity of Water—Unlessotherwiseindicated,references
E180 Practice for Determining the Precision of ASTM
towatershallbeunderstoodtomeanreagentwaterconforming
Methods for Analysis and Testing of Industrial and Spe-
to Type II of Specification D1193.
cialty Chemicals
6.3 Ammonium Chloride (NH Cl).
4
E300 Practice for Sampling Industrial Chemicals
6.4 Ammonium Hydroxide (sp gr 0.90)Concentratedammo-
3. Summary of Test Method nium hydroxide (NH OH).
4
6.5 Buffer Solution (pH 10.0)—Dissolve67.5gofNH Clin
4
3.1 The liquid drier is dissolved in glacial acetic acid,
water, add 570 mL of concentrated NH OH (sp gr 0.90), and
4
diluted with isopropyl alcohol and water, and treated with an
dilute to 1 L.
6.6 Cupric Sulfate, Standard Solution (0.05 M)—Dissolve
1
12.5 g of cupric sulfate pentahydrate (CuSO ·5H O) in water
This test method is under the jurisdiction of ASTM Committee D01 on Paint
4 2
and Related Coatings, Materials, andApplications and is the direct responsibility of
and dilute to 1 L.
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.
Current edition approved Jan. 1, 2005. Published February 2005. Originally
3
approved in 1965. Last previous edition approved in 1999 as D2373–85(1999). Reagent Chemicals, American Chemical Society Specifications, American
DOI: 10.1520/D2373-05. Chemical Society, Washington, DC. For suggestions on the testing of reagents not
2
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 [e-mail]. 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 ASTM website. MD.
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D2373–05
6.7 Eriochrome Black-T Indicator—Triturate 0.20 g of the
V = EDTA solution, mL, and
1
−3
concentrated dye with 100 g of sodium chloride (NaCl) and
0.0814 = molecular weight of ZnO 310
store in a tightly stoppered jar.This mixture remains stable for
= millimolar weight
...