ASTM D3256-86(2004)
(Test Method)Standard Test Methods for Chemical Analysis of Phthalocyanine Blue and Green Pigments
Standard Test Methods for Chemical Analysis of Phthalocyanine Blue and Green Pigments
SIGNIFICANCE AND USE
These test methods are suitable for determining if impurities are present and establishing that the required pigments are present. These test methods may be used for manufacturing and purchasing quality control.
SCOPE
1.1 These test methods cover procedures for the qualitative chemical analysis of pigments known commercially as copper phthalocyanine blue and green.
1.2 The procedures appear in the following order:SectionIdentification5Moisture and Other Volatile Matter6Detection of Basic Dye Derivatives7Detection of Other Organic Coloring Matter8Detection of Ultramarine Blue9Detection of Iron Blue or Chrome Green 10
1.3 This standard does not purport to address 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:D3256–86(Reapproved2004)
Standard Test Methods for
Chemical Analysis of Phthalocyanine Blue and Green
Pigments
This standard is issued under the fixed designation D 3256; 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 all reagents shall conform to the specifications of the Commit-
tee onAnalytical Reagents of theAmerican Chemical Society,
1.1 These test methods cover procedures for the qualitative
where such specifications are available. Other grades may be
chemical analysis of pigments known commercially as copper
used, provided it is first ascertained that the reagent is of
phthalocyanine blue and green.
sufficiently high purity to permit its use without lessening the
1.2 The procedures appear in the following order:
accuracy of the determination.
Section
4.2 Purity of Water—Unless otherwise indicated, references
Identification 5
to water shall be understood to mean Type II reagent grade
Moisture and Other Volatile Matter 6
Detection of Basic Dye Derivatives 7
water conforming to Specification D 1193.
Detection of Other Organic Coloring Matter 8
Detection of Ultramarine Blue 9
5. Identification
Detection of Iron Blue or Chrome Green 10
5.1 To about 0.05 g of the sample in a 50-mLbeaker, add 30
1.3 This standard does not purport to address the safety
mL of sulfuric acid (H SO , sp gr 1.84). Stir occasionally for
2 4
concerns, if any, associated with its use. It is the responsibility
15 min, heating if necessary to accelerate the solution of the
of the user of this standard to establish appropriate safety and
pigment. Formation of a dark greenish yellow solution indi-
health practices and determine the applicability of regulatory
cates phthalocyanine blue and a dark reddish color indicates
limitations prior to use.
brominated green pigment. Pour the solution into 250 mL of
water and stir. The phthalocyanine pigment should immedi-
2. Referenced Documents
ately precipitate as a flocculent mass.
2.1 ASTM Standards:
5.2 Filter off the precipitate, washing once or twice with
D 280 Test Methods for Hygroscopic Moisture (and Other
water. Scrape a small amount of the precipitate off the filter,
Matter Volatile Under the Test Conditions) in Pigments
place on a clean platinum wire moistened with hydrochloric
D 1193 Specification for Reagent Water
acid (HCl), and subject it to the low flame of a bunsen burner.
As the precipitate burns, a light blue-green flame should be
3. Significance and Use
clearly evident. This indicates organically combined copper.
3.1 These test methods are suitable for determining if
impurities are present and establishing that the required pig-
NOTE 1—Characteristic spectrophotometric absorption spectra in the
near infrared range (700 to 900 nm) are exhibited by dilute solutions of
ments are present. These test methods may be used for
copper phthalocyanine pigments (2 to 50 mg/L) in H SO (sp gr 1.84).
manufacturing and purchasing quality control. 2 4
The absorption maxima, being sharp and well-defined, may be used for
positivequalitativeidentificationofphthalocyaninepigments.Phthalocya-
4. Reagents
nine green has maxima at approximately 820 nm and 860 nm for
4.1 Purity of Reagents—Reagent grade chemicals shall be
bromine-free types; for the chlorinated-brominated types, the maxima
used in all tests. Unless otherwise indicated, it is intended that
appear at approximately 830 to 840 nm and 875 to 885 nm.
These test methods are under the jurisdiction of ASTM Committee D01 on
Paint and Related Coatings, Materials, and Applications and are the direct
responsibility of Subcommittee D01.31 on Pigment Specifications.
Current edition approved June 1, 2004. Published June 2004. Originally Reagent Chemicals, American Chemical Society Specifications, American
approved in 1973. Last previous edition approved in 1999 as D 3256 – 86 (1999). Chemical Society, Washington, DC. For suggestions on the testing of reagents not
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 service@astm.org. For Annual Book of ASTM Chemicals, BDH Ltd., Poole, Dorset, U.K., and
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