ASTM D2352-85(2010)

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

SIGNIFICANCE AND USE
Calcium sulfate pigments such as titanium-calcium have been used in paints in varying degrees in the past years. As such it is useful to the formulator and the user to be able to monitor the amount of this compound in whole 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 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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.

General Information

• Status: Historical
• Publication Date: 31-May-2010
• 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

• Replaces: ASTM D2352-85(2005) - Standard Test Method for Sulfur Dioxide in White Pigment Separated from Solvent-Reducible Paints
• Effective Date: 01-Jun-2010

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 (Reapproved2010)
Standard Test Method for
Sulfur Dioxide in White Pigment Separated from Solvent-
1
Reducible Paints
This standard is issued under the fixed designation D2352; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Significance and Use
1.1 This test method covers the determination of sulfur 4.1 Calciumsulfatepigmentssuchastitanium-calciumhave
dioxide in white pigment separated from solvent-reducible been used in paints in varying degrees in the past years. As
paints. such it is useful to the formulator and the user to be able to
monitor the amount of this compound in whole paints.
1.2 This test method is not applicable in the presence of
sulfides decomposable under the conditions given.
5. Reagents
1.3 The values stated in SI units are to be regarded as the
5.1 Purity of Reagents—Reagent grade chemicals shall be
standard. The values given in parentheses are for information
used in all tests. Unless otherwise indicated, it is intended that
only.
all reagents shall conform to the specifications of the Commit-
1.4 This standard does not purport to address all of the
tee onAnalytical Reagents of theAmerican Chemical Society,
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safety concerns, if any, associated with its use. It is the
where such specifications are available. Other grades may be
responsibility of the user of this standard to establish appro-
used, provided it is first ascertained that the reagent is of
priate safety and health practices and determine the applica-
sufficiently high purity to permit its use without lessening the
bility of regulatory limitations prior to use.
accuracy of the determination.
5.2 Unless otherwise indicated, references to water shall be
2. Referenced Documents
understood to mean Type II reagent grade water, in accordance
2
2.1 ASTM Standards:
with Specification D1193.
D1193 Specification for Reagent Water
5.3 Hydrochloric Acid (1+3) —Mix 1 volume of concen-
D2371 Test Method for Pigment Content of Solvent-
trated hydrochloric acid (HCl, sp gr 1.19) with 3 volumes of
Reducible Paints
water.
3. Summary of Test Method
5.4 Iodine, Standard Solution (0.05 N) (for SO )—Place 15
2
to 20 g of pure potassium iodide (KI) in a 1-L flask, dissolve
3.1 The extracted pigment is placed in a flask and then
in as little water as possible, and then add about 6.4 g of
sulfur dioxide (SO ) is released by addition of hydrochloric
2
resublimediodine.Shakeuntiltheiodineisalldissolved,dilute
acid (HCl) and bubbled through an absorption flask containing
to the mark with water, and mix. Standardize the solution
iodine solution and potassium iodide (KI). The solution is
against 0.05 N Na S O solution to obtain its true normality.
titrated with sodium thiosulfate (Na S O ) using starch indi-
2 2 3
2 2 3
cator.
5.5 Potassium Iodide Solution (100 g/L)—Dissolve 100 g of
potassium iodide (KI) in water and dilute to 1 L.
3.2 A blank is run as directed in 3.1 with the pigment
omitted. The blank is then subtracted from the figure obtained
5.6 Sodium Thiosulfate, Standard (0.05 N) Solution (for
for the sample titration and SO is calculated.
2 SO )—Dissolve pure sodium thiosulfate Na S O in water
2 2 2 3
(that has been well boiled to free it from carbon dioxide) in the
proportion of 12.42 g of Na S O ·5H O to 1 L of the solution.
2 2 3 2
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This test method is under the jurisdiction of ASTM Committee D01 on Paint
It is best to let this solution stand for about two weeks before
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.
Current edition approved June 1, 2010. Published June 2010. Originally
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approved in 1965. Last previous edition approved in 2005 as D2352 – 85 (2005). Reagent Chemicals, American Chemical Society Specifications, American
DOI: 10.1520/D2352-85R10. 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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