ASTM D2373-05(2011)

Standard Test Method for Determination of Cobalt in Paint Driers by EDTA Method (Withdrawn 2016)

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.
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.
WITHDRAWN RATIONALE
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).
Formerly under the jurisdiction of Committee D01 on Paint and Related Coatings, Materials, and Applications, this test method was withdrawn in April 2016. This standard is being withdrawn without replacement due to its limited use by industry.

General Information

• Status: Withdrawn
• Publication Date: 31-May-2011
• Withdrawal Date: 05-Apr-2016
• 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 D2373-05 - Standard Test Method for Determination of Cobalt in Paint Driers by EDTA Method
• Effective Date: 01-Jun-2011
• Referred By: ASTM D564-87(2023) - Standard Test Methods for Liquid Paint Driers
• Effective Date: 01-Jun-2011

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 (Reapproved2011)
Standard Test Method for
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.
5. Apparatus
1.4 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
5.1 Centrifuge, capable of developing 1000 to 2000 g.
only.
6. Reagents
1.5 This standard does not purport to address all of the
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,
where such specifications are available. Other grades may be
2. Referenced Documents
used, provided it is first ascertained that the reagent is of
sufficiently high purity to permit its use without lessening the
2.1 ASTM Standards:
accuracy of the determination.
D600Specification for Liquid Paint Driers
D1193Specification for Reagent Water
6.2 Purity of Water—Unless otherwise indicated, references
E180Practice for Determining the Precision of ASTM
towatershallbeunderstoodtomeanreagentwaterconforming
Methods for Analysis and Testing of Industrial and Spe-
to Type II of Specification D1193.
cialty Chemicals (Withdrawn 2009)
6.3 Ammonium Chloride (NH Cl).
E300Practice for Sampling Industrial Chemicals
6.4 Ammonium Hydroxide (sp gr 0.90)Concentrated ammo-
3. Summary of Test Method
nium hydroxide (NH OH).
3.1 The liquid drier is dissolved in glacial acetic acid,
6.5 Buffer Solution (pH 10.0)—Dissolve 67.5 g of NH Cl in
diluted with isopropyl alcohol and water, and treated with an
water, add 570 mL of concentrated NH OH (sp gr 0.90), and
dilute to 1 L.
1 6.6 Cupric Sulfate, Standard Solution (0.05 M)—Dissolve
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of 12.5 g of cupric sulfate pentahydrate (CuSO ·5H O) in water
4 2
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.
and dilute to 1 L.
Current edition approved June 1, 2011. Published June 2011. Originally
approved in 1965. Last previous edition approved in 2005 as D2373–05. DOI:
10.1520/D2373-05R11.
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 [e-mail]. 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
D2373 − 05 (2011)
6.7 Eriochrome Black-T Indicator—Triturate 0.20 g of the W
M 5 (1)
concentrated dye with 100 g of sodium chloride (NaCl) and ~V 30.0814!
store in a tightly stoppered jar.This mixture remains stable for
where:
several years.
W = ZnO used, g,
6.8 EDTA, Standard Solution (0.05 M)—Dissolve 18.62 g
V = EDTA solution, mL, and
−3
of EDTAin water and dilute to 1 L. Store in a polyethylene or
0.0814 = molecular weight of ZnO×10
borosilicate glass bottle. = millimolar weight of ZnO.
6.9 Glacial Acetic Acid (sp gr 1.06). 8.2 CuSO , Standard Solution (0.05 M)—Determine the
titer of the CuSO solution by titrating 50 mL of the standard
6.10 Isopropyl Alcohol, 99.5%.
EDTAsolution with CuSO as described in 9.4 using the PAN
6.11 Methyl Red Indicator Solution—Dissolve 0.2 g of
indicator solution.
methyl red in 100 mL of methanol, ethanol, or isopropanol.
8.2.1 Calculate the molarity, M , of the CuSO solution as
2 4
follows:
...