ASTM D2374-85(1999)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D2374–85(Reapproved1999)
Standard Test Method for
Lead in Paint Driers by EDTA Method
This standard is issued under the fixed designation D2374; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope lead drier soluble in glacial acetic acid and manufactured for
use by the coatings industry.
1.1 This test method covers a titrimetric determination of
leadinliquidpaintdriersthatcanbedissolvedinglacialacetic
5. Apparatus
acid and utilizes the disodium salt of ethylenediaminetetraace-
5.1 Centrifuge, capable of developing 1000 to 2000 g.
tic acid dihydrate (EDTA).
1.2 This test method is not applicable to drier blends. If
6. Reagents
driers other than cobalt are present, they may interfere by
6.1 Purity of Reagents—Reagent grade chemicals shall be
reacting with EDTA under the conditions used for analysis.
used in all tests. Unless otherwise indicated, it is intended that
1.3 All cations that can be titrated with EDTA in alkaline
all reagents shall conform to the specifications of the Commit-
media interfere and must not be present in the sample.
tee onAnalytical Reagents of theAmerican Chemical Society,
1.4 This standard does not purport to address all of the
where such specifications are available. Other grades may be
safety concerns, if any, associated with its use. It is the
used, provided it is first ascertained that the reagent is of
responsibility of the user of this standard to establish appro-
sufficiently high purity to permit its use without lessening the
priate safety and health practices and determine the applica-
accuracy of the determination.
bility of regulatory limitations prior to use.
6.2 Purity of Water—Unlessotherwiseindicated,references
2. Referenced Documents towatershallbeunderstoodtomeanreagentwaterconforming
to Type II of Specification D1193.
2.1 ASTM Standards:
6.3 Ammonium Chloride (NH Cl).
D600 Specification for Liquid Paint Driers
3 6.4 Ammonium Hydroxide (sp gr 0.90)—Concentrated am-
D1193 Specification for Reagent Water
monium hydroxide (NH OH).
E180 Practice for Determining the Precision of ASTM
4 6.5 Buffer Solution(pH10.0)—Dissolve67.5gofNH Clin
Methods forAnalysis andTesting of Industrial Chemicals
4 water, add 570 mL of concentrated NH OH (sp gr 0.90), and
E300 Practice for Sampling Industrial Chemicals
dilute to 1 L.
3. Summary of Test Method 6.6 Cupric Sulfate, Standard Solution (0.05 M)—Dissolve
12.5 g of cupric sulfate pentahydrate (CuSO ·5H O) in water
4 2
3.1 The liquid drier is dissolved in glacial acetic acid,
and dilute to 1 L.
diluted with isopropyl alcohol and water, and treated with an
6.7 Eriochrome Black-T Indicator—Triturate 0.20 g of the
excess of standard EDTA solution. The excess is titrated with
concentrated dye with 100 g of NaCl and store in a tightly
standard cupric sulfate solution using PAN as the metal
stoppered jar. This mixture remains stable for several years.
indicator.
6.8 EDTA, Standard Solution (0.05 M)—Dissolve 18.62 g
4. Significance and Use
of EDTAin water and dilute to 1 L. Store in a polyethylene or
borosilicate glass bottle.
4.1 Theamountofleaddrierusedinoxidizing-typecoatings
6.9 Glacial Acetic Acid (sp gr 1.06).
significantly affects their drying properties. This test method
6.10 Isopropyl Alcohol (99.5%).
may be used to confirm the stated lead content of pure liquid
6.11 Methyl Red Indicator—Dissolve0.2gofmethylredin
100 mL of methanol, ethanol, or isopropanol.
This test method is under the jurisdiction of ASTM Committee D-1 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials. Reagent Chemicals, American Chemical Society Specifications, American
Current edition approved Oct. 25, 1985. Published December 1985. Originally Chemical Society, Washington, DC. For suggestions on the testing of reagents not
published as D2374–65T. Last previous edition D2374–79. listed by the American Chemical Society, see Analar Standards for Laboratory
Annual Book of ASTM Standards, Vol 06.04. Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
Annual Book of ASTM Standards, Vol 11.01. and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
Annual Book of ASTM Standards, Vol 15.05. MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D2374
6.12 PAN Indicator (1(2-Pyridylazo)-2-Naphthol)—Prepare
where:
a dilute solution of the indicator by dissolving 0.10 g in 100
M 5 molarity of EDTA solution,
mL of ethanol or isopropanol.
V 5 EDTA solution, mL, and
6.13 Sodium Acetate Solution—Prepare a saturated aqueous V 5 CuSO solution, mL.
3 4
solution of sodium acetate (NaC H O ) in water.
2 3 2
...