ASTM D2375-85(1999)
(Test Method)Standard Test Method for Manganese in Paint Driers by EDTA Method
Standard Test Method for Manganese in Paint Driers by EDTA Method
SCOPE
1.1 This test method covers a titrimetric determination of manganese in liquid paint driers that can be dissolved in a toluene-alcohol mixture and utilizes the disodium salt of ethylenediaminetetraacetic acid dihydrate (EDTA).
1.2 This test method is not applicable to drier blends.
1.3 All cations that can be titrated with EDTA in alkaline media interfere and must not be present in the sample.
1.4 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.
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Designation:D2375–85(Reapproved1999)
Standard Test Method for
Manganese in Paint Driers by EDTA Method
This standard is issued under the fixed designation D 2375; 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 6. Reagents
1.1 This test method covers a titrimetric determination of 6.1 Purity of Reagents—Reagent grade chemicals shall be
manganese in liquid paint driers that can be dissolved in a used in all tests. Unless otherwise indicated, it is intended that
toluene-alcohol mixture and utilizes the disodium salt of all reagents shall conform to the specifications of the Commit-
ethylenediaminetetraacetic acid dihydrate (EDTA). tee onAnalytical Reagents of theAmerican Chemical Society,
1.2 This test method is not applicable to drier blends. where such specifications are available. Other grades may be
1.3 All cations that can be titrated with EDTA in alkaline used, provided it is first ascertained that the reagent is of
media interfere and must not be present in the sample. sufficiently high purity to permit its use without lessening the
1.4 This standard does not purport to address all of the accuracy of the determination.
safety concerns, if any, associated with its use. It is the 6.2 Purity of Water—Unless otherwise indicated, references
responsibility of the user of this standard to establish appro- to water shall be understood to mean reagent water conforming
priate safety and health practices and determine the applica- to Type II of Specification D 1193.
bility of regulatory limitations prior to use. 6.3 Ammonium Chloride (NH Cl).
6.4 Ammonium Hydroxide (sp gr 0.90)—Concentrated am-
2. Referenced Documents
monium hydroxide (NH OH).
2.1 ASTM Standards: 6.5 l-Ascorbic Acid.
D 600 Specification for Liquid Paint Driers
6.6 Buffer Solution—Add 350 mLof concentrated NH -OH
D 1193 Specification for Reagent Water (sp gr 0.90) to 54 g of NH Cl and dilute to 1 L with water.
E 180 Practice for Determining the Precision of ASTM
6.7 Eriochrome Black-T Indicator—Triturate 0.2 g of Erio-
Methods forAnalysis and Testing of Industrial Chemicals chrome Black-T and 100 g of NaCl, and store the mixture in a
E 300 Practice for Sampling Industrial Chemicals
tightlystopperedbottle.Thismixtureremainsstableforseveral
years.
3. Summary of Test Method
6.8 Ethyl Alcohol (95 %), pure or denatured.
3.1 The liquid drier is dissolved in toluene and ethyl alcohol
6.9 EDTA, Standard Solution (0.05 M)—Dissolve 18.62 g
and treated with an excess of standard EDTA solution. The
of EDTAin water and dilute to 1 L. Store in a polyethylene or
excess is titrated with standard zinc chloride solution using
borosilicate glass bottle.
Eriochrome Black-T as the indicator.
6.10 Hydrochloric Acid (sp gr 1.19)—Concentrated (hydro-
chloric acid (HCl).
4. Significance and Use
6.11 Sodium Chloride (NaCl).
4.1 The amount of manganese drier used in oxidizing-type
6.12 Toluene.
coatings significantly affects their drying properties. This test
6.13 Zinc, Granular.
method may be used to confirm the stated manganese content
6.14 Zinc Chloride, Standard Solution (0.05 M)—Weigh
of pure liquid manganese drier soluble in toluene-alcohol and
3.2690 g of zinc to the nearest 0.5 mg and dissolve in 50 mL
manufactured for use by the coatings industry.
of dilute HCl (14 mL of concentrated HCl (sp gr 1.19) to 36
mL of water). Warm if necessary. Dilute the zinc chloride
5. Apparatus
(ZnCl ) solution to 1 L in a volumetric flask.
5.1 Centrifuge, capable of developing 1000 to 2000 g.
M 5 3.2690/65.37 (1)
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 Nov. 29, 1985. Published January 1986. Originally Chemical Society, Washington, DC. For suggestions on the testing of reagents not
published as D 2375 – 65 T. Last previous edition D 2375 – 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, Vols 06.01 and 11.01. and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
Annual Book of ASTM Standards, Vol 15.05. MD.
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