ASTM D715-86(2008)

Standard Test Methods for Analysis of Barium Sulfate Pigment

SIGNIFICANCE AND USE
These test methods are used to determine the purity of barium sulfate and to determine the concentration of known impurities. This information is useful to producers and users as an aid in the manufacture of coatings.
SCOPE
1.1 These test methods cover the analysis of barium sulfate pigment.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 This standard does not purport to address the safety concerns 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-Jan-2008
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.31 - Pigment Specifications

Relations

• Replaces: ASTM D715-86(2003) - Standard Test Methods for Analysis of Barium Sulfate Pigment
• Effective Date: 01-Feb-2008
• Replaced By: ASTM D715-86(2014) - Standard Test Methods for Analysis of Barium Sulfate Pigment
• Effective Date: 01-Dec-2014
• Referred By: ASTM D602-81(2019) - Standard Specification for Barium Sulfate Pigments
• Effective Date: 01-Feb-2008
• Referred By: ASTM D34-08(2023) - Standard Guide for Chemical Analysis of White Pigments
• Effective Date: 01-Feb-2008

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D715 − 86 (Reapproved2008)
Standard Test Methods for
Analysis of Barium Sulfate Pigment
This standard is issued under the fixed designation D715; 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 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 D1193.
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 ).
2 4 2 4
2.1 ASTM Standards:
5.3 Hydrochloric Acid (sp gr 1.19)—Concentrated hydro-
D185 Test Methods for Coarse Particles in Pigments
chloric acid (HCl).
D280 Test Methods for Hygroscopic Moisture (and Other
Matter Volatile Under the Test Conditions) in Pigments
5.4 Hydrochloric Acid (1+1)—Mix equal volumes of con-
D1193 Specification for Reagent Water
centrated HCl (sp gr 1.19) and water.
D1208 Test Methods for Common Properties of Certain
5.5 Methyl Red Indicator Solution—Dissolve 0.2 g of
Pigments
methyl red in 100 mL of methanol, ethanol, or isopropanol.
E832 Specification for Laboratory Filter Papers
5.6 Sodium Carbonate Solution (30 g/L)—Dissolve 30 g of
3. Significance and Use Na CO in water and dilute to 1 L.
2 3
3.1 These test methods are used to determine the purity of
6. Procedure
barium sulfate and to determine the concentration of known
6.1 Weigh to 0.1 mg approximately 0.5 g of the sample into
impurities.This information is useful to producers and users as
a platinum crucible, add3gofNa CO , mix thoroughly, and
an aid in the manufacture of coatings. 2 3
fuse until the melt is clear. Allow the melt to cool and then
4. Purity of Reagents leach in a platinum dish with hot water until it is entirely
disintegrated. Filter on a close-texture paper and wash thor-
4.1 Reagent grade chemicals shall be used in all tests.
oughly with hot Na CO solution (30 g/L).
2 3
Unless otherwise indicated, it is intended that all reagents shall
conform to the specifications of the Committee on Analytical
6.2 Transfer the filter paper containing the insoluble carbon-
Reagents of the American Chemical Society, where such
ates to a 250-mLbeaker and acidify with concentrated HCl (sp
gr 1.19).Wash the fusion crucible with HCl (sp gr 1.19) so that
no barium is lost. Boil the solution, filter into a 600-mLbeaker,
These test methods are under the jurisdiction of ASTM Committee D01 on
and wash well with water. Add methyl red indicator solution,
Paint and Related Coatings, Materials, and Applications and are the direct
responsibility of Committee D01.31 on Pigment Specifications.
Current edition approved Feb. 1, 2008. Published February 2008. Originally
approved in 1943. Last previous edition approved in 2003 as D715 – 86 (2003). Reagent Chemicals, American Chemical Society Specifications, American
DOI: 10.1520/D0715-86R08. 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 [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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D715 − 86 (2008)
and add NH OH (sp gr 0.90) until the solution is slightly 10 mL of concentrated H SO (sp gr 1.84) and 10 mL of
4 2 4
alkaline. Add 6 mL of HCl (1+1), and dilute to 300 mL. NH CNS, dilute to 60 or 70 mL and then add the test solution
from the buret until the depth of color thus produced on
6.3 Heat the solution to boiling, and add5gof(NH ) SO
4 2 4
dilutionto100mLexactlymatchesthatofthestandard.Record
dissolved in 40 mL of water. If low-grade material is being
the number of millilitres required.
analyzed, the (NH ) SO solution should be added drop by
4 2 4
drop from a buret to minimize inclusion. If the barytes is a
11. Calculation
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 31.4298!/S # 3100 (2)
barium salts. Allow the precipitate of BaSO to digest for 4 h
2 3 2
or overnight, and filter through a close-texture paper. Wash the
where:
precipitate with as little cold water as possible (consistent with
I = iron in standard, g,
thepurityoftheprecipitate),igniteinanoxidizingatmosphere,
1.4298 =
Fe O 159.694
and weigh as BaSO . 2 3
5 , and
Fe 111.694
7. Calculation
S = sample used, g.
7.1 Calculate the percent of BaSO as follows:
BaSO,% 5 P/S 3100 (1)
~ ! HYDROGEN ION CONCENTRATION
4 1
where:
12. Procedure
P = BaSO,g,and
4 12.1 Determine the pH in accordance with Test Metho
...