ASTM D2352-85(1999)

Standard Test Method for Sulfur Dioxide in White Pigment Separated from Solvent-Reducible Paints

SCOPE
1.1 This test method covers the determination of sulfur dioxide in white pigment separated from solvent-reducible paints.  
1.2 This test method is not applicable in the presence of sulfides decomposable under the conditions given.  
1.3 This standard does not purport to address the safety problems 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: 09-May-1999
• ICS: 87.060.10 - Pigments and extenders
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.21 - Chemical Analysis of Paints and Paint Materials

Relations

• Replaced By: ASTM D2352-85(2005) - Standard Test Method for Sulfur Dioxide in White Pigment Separated from Solvent-Reducible Paints
• 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D2352–85(Reapproved 1999)
Standard Test Method for
Sulfur Dioxide in White Pigment Separated from Solvent-
Reducible Paints
This standard is issued under the fixed designation D 2352; 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 5. Reagents
1.1 This test method covers the determination of sulfur 5.1 Purity of Reagents—Reagent grade chemicals shall be
dioxide in white pigment separated from solvent-reducible used in all tests. Unless otherwise indicated, it is intended that
paints. all reagents shall conform to the specifications of the Commit-
1.2 This test method is not applicable in the presence of tee on Analytical Reagents of the American Chemical Society,
sulfides decomposable under the conditions given. where such specifications are available. Other grades may be
1.3 This standard does not purport to address all of the used, provided it is first ascertained that the reagent is of
safety concerns, if any, associated with its use. It is the sufficiently high purity to permit its use without lessening the
responsibility of the user of this standard to establish appro- accuracy of the determination.
priate safety and health practices and determine the applica- 5.2 Unless otherwise indicated, references to water shall be
bility of regulatory limitations prior to use. understood to meanType II reagent grade water, conforming to
Specification D 1193.
2. Referenced Documents
5.3 Hydrochloric Acid (1 + 3)—Mix 1 volume of concen-
2.1 ASTM Standards: trated hydrochloric acid (HCl, sp gr 1.19) with 3 volumes of
D 1193 Specification for Reagent Water
water.
D 2371 Test Method for Pigment Content of Solvent- 5.4 Iodine, Standard Solution (0.05 N) (for SO )—Place 15
Reducible Paints
to 20 g of pure potassium iodide (KI) in a 1-L flask, dissolve
in as little water as possible, and then add about 6.4 g of
3. Summary of Test Method
resublimediodine.Shakeuntiltheiodineisalldissolved,dilute
3.1 The extracted pigment is placed in a flask and then
to the mark with water, and mix. Standardize the solution
sulfur dioxide (SO ) is released by addition of hydrochloric
against 0.05 N Na S O solution to obtain its true normality.
2 2 3
acid (HCl) and bubbled through an absorption flask containing
5.5 Potassium Iodide Solution(100g/L)—Dissolve100gof
iodine solution and potassium iodide (KI). The solution is
potassium iodide (KI) in water and dilute to 1 L.
titrated with sodium thiosulfate (Na S O ) using starch indi-
5.6 Sodium Thiosulfate, Standard (0.05 N) Solution (for
2 2 3
cator.
SO )—Dissolve pure sodium thiosulfate Na S O in water
2 2 2 3
3.2 A blank is run as directed in 3.1 with the pigment
(that has been well boiled to free it from carbon dioxide) in the
omitted. The blank is then subtracted from the figure obtained
proportion of 12.42 g of Na S O ·5H O to 1 Lof the solution.
2 2 3 2
for the sample titration and SO is calculated.
It is best to let this solution stand for about two weeks before
standardizing. Standardize with pure resublimed iodine, pure
4. Significance and Use
potassiumbiiodate,orpurepotassiumiodate.Thissolutionwill
4.1 Calcium sulfate pigments such as titanium-calcium have
be approximately 0.05 N, and it is best to leave it as it is after
been used in paints in varying degrees in the past years. As
determining its exact iodine value, rather than to attempt to
such it is useful to the formulator and the user to be able to
monitor the amount of this compound in whole paints.
Reagent Chemicals, American Chemical Society Specifications, American
This test method is under the jurisdiction of ASTM Committee D-1 on Paint Chemical Society, Washington, DC. For suggestions on the testing of reagents not
and Related Coatings, Materials, andApplications and is the direct responsibility of listed by the American Chemical Society, see Analar Standards for Laboratory
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials. Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
Current edition approved Nov. 29, 1985. Published January 1986. Originally and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
e1
published as D 2352 – 65 T. Last previous edition D 2352 – 73 (1979) . MD.
2 5
Annual Book of ASTM Standards,
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