ASTM D715-86(2003)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D715–86(Reapproved2003)
Standard Test Methods for
Analysis of Barium Sulfate Pigment
This standard is issued under the fixed designation D 715; 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 specifications are available. Other grades may be used, pro-
vided it is first ascertained that the reagent is of sufficiently
1.1 These test methods cover the analysis of barium sulfate
high purity to permit its use without lessening the accuracy of
pigment.
the determination.
1.2 The values stated in SI units are to be regarded as the
4.2 Unless otherwise indicated, references to water shall be
standard. The values given in parentheses are for information
understood to mean reagent water conforming to Type II of
only.
Specification D 1193.
1.3 This standard does not purport to address the safety
concerns associated with its use. It is the responsibility of the
BARIUM SULFATE
user of this standard to establish appropriate safety and health
practices and determine the applicability of regulatory limita-
5. Reagents
tions prior to use.
5.1 Ammonium Hydroxide (sp gr 0.90)—Concentrated am-
monium hydroxide (NH OH).
2. Referenced Documents
5.2 Ammonium Sulfate ((NH ) SO ).
4 2 4
2.1 ASTM Standards:
5.3 Hydrochloric Acid (sp gr 1.19)—Concentrated hydro-
D 185 Test Methods for Coarse Particles in Pigments,
chloric acid (HCl).
Pastes, and Paints
5.4 Hydrochloric Acid (1+1)—Mix equal volumes of con-
D 280 Test Methods for Hygroscopic Moisture (and Other
centrated HCl (sp gr 1.19) and water.
Matter Volatile Under the Test Conditions) in Pigments
5.5 Methyl Red Indicator Solution—Dissolve 0.2 g of me-
D 1193 Specification for Reagent Water
thyl red in 100 mL of methanol, ethanol, or isopropanol.
D 1208 Test Methods for Common Properties of Certain
5.6 Sodium Carbonate Solution (30 g/L)—Dissolve 30 g of
Pigments
Na CO in water and dilute to 1 L.
2 3
E 832 Specification for Laboratory Filter Papers
6. Procedure
3. Significance and Use
6.1 Weigh to 0.1 mg approximately 0.5 g of the sample into
3.1 These test methods are used to determine the purity of
a platinum crucible, add3gofNa CO , mix thoroughly, and
2 3
barium sulfate and to determine the concentration of known
fuse until the melt is clear. Allow the melt to cool and then
impurities.This information is useful to producers and users as
leach in a platinum dish with hot water until it is entirely
an aid in the manufacture of coatings.
disintegrated. Filter on a close-texture paper and wash thor-
oughly with hot Na CO solution (30 g/L).
4. Purity of Reagents 2 3
6.2 Transferthefilterpapercontainingtheinsolublecarbon-
4.1 Reagent grade chemicals shall be used in all tests.
ates to a 250-mLbeaker and acidify with concentrated HCl (sp
Unless otherwise indicated, it is intended that all reagents shall
gr 1.19).Wash the fusion crucible with HCl (sp gr 1.19) so that
conform to the specifications of the Committee on Analytical
no barium is lost. Boil the solution, filter into a 600-mLbeaker,
Reagents of the American Chemical Society, where such
and wash well with water. Add methyl red indicator solution,
and add NH OH (sp gr 0.90) until the solution is slightly
1 alkaline. Add 6 mL of HCl (1+1), and dilute to 300 mL.
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 Committee D01.31 on Pigment Specifications.
Current edition approved Oct. 1, 2003. Published October 2003. Originally
Reagent Chemicals, American Chemical Society Specifications, American
approved in 1943. Last previous edition approved in 1986 as D 715 – 86 (1999).
Chemical Society, Washington, DC. For suggestions on the testing of reagents not
Annual Book of ASTM Standards, Vol 06.03.
listed by the American Chemical Society, see Analar Standards for Laboratory
Annual Book of ASTM Standards, Vol 11.01. Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
Annual Book of ASTM Standards, Vol 14.04. and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D715–86 (2003)
6.3 Heat the solution to boiling, and add5gof(NH ) SO 100 mL exactly matches that of the standard. Record the
4 2 4
dissolved in 40 mL of water. If low-grade material is being number of millilitres required.
analyzed, the (NH ) SO solution should be added drop by
4 2 4
11. Calculation
drop from a buret to minimize inclusion. If the barytes is a
rather pure product (95 to 99 % BaSO ), this is not necessary, 11.1 Calculate the percent of Fe O as follows:
2 3
since the only nonvolatile constituents of the solution will be
Fe O,% 5 @~I 3 1.4298!/S # 3 100 (2)
2 3 2
barium salts. Allow the precipitate of BaSO to digest for 4 h
where:
or overnight, and filter through a close-texture paper. Wash the
I = iron in standard, g,
precipitate with as little cold water as possible (consistent with
1.4298 = Fe O 159.694
thepurityoftheprecipitate),igniteinanoxidizingatmosphere, 2 3
5 , and
Fe 111.694
and weigh as BaSO .
4 2
S = sample used, g.
7. Calculation
HYDROGEN ION CONCENTRATION
7.1 Calculate the percent of BaSO as follows:
BaSO,% 5 ~P/S ! 3 100 (1) 12. Procedure
4 1
12.1 Determine the pH in accordance with Test Methods
D 1208.
where:
P = BaSO,g,and
MATTER SOLUBLE IN WATER
S = sample used, g.
13. Procedure
FERRIC OXIDE
13.1 Determine the amount of water soluble material
8. Apparatus present in accordance wit
...