ASTM D715-86(2020)
(Test Method)Standard Test Methods for Analysis of Barium Sulfate Pigment
Standard Test Methods for Analysis of Barium Sulfate Pigment
SIGNIFICANCE AND USE
3.1 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 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D715 − 86 (Reapproved 2020)
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 4. Purity of Reagents
1.1 These test methods cover the analysis of barium sulfate 4.1 Reagent grade chemicals shall be used in all tests.
pigment. Unless otherwise indicated, it is intended that all reagents shall
conform to the specifications of the Committee on Analytical
1.2 The values stated in SI units are to be regarded as the
Reagents of the American Chemical Society, where such
standard. The values given in parentheses are for information
specifications are available. Other grades may be used, pro-
only.
vided it is first ascertained that the reagent is of sufficiently
1.3 This standard does not purport to address all of the
high purity to permit its use without lessening the accuracy of
safety concerns, if any, associated with its use. It is the
the determination.
responsibility of the user of this standard to establish appro-
4.2 Unless otherwise indicated, references to water shall be
priate safety, health, and environmental practices and deter-
understood to mean reagent water conforming to Type II of
mine the applicability of regulatory limitations prior to use.
Specification D1193.
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard-
BARIUM SULFATE
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
5. Reagents
mendations issued by the World Trade Organization Technical
5.1 Ammonium Hydroxide (sp gr 0.90)—Concentrated am-
Barriers to Trade (TBT) Committee.
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-
D185 Test Methods for Coarse Particles in Pigments
chloric acid (HCl).
D280 Test Methods for Hygroscopic Moisture (and Other
5.4 Hydrochloric Acid (1+1)—Mix equal volumes of con-
Matter Volatile Under the Test Conditions) in Pigments
centrated HCl (sp gr 1.19) and water.
D1193 Specification for Reagent Water
5.5 Methyl Red Indicator Solution—Dissolve 0.2 g of
D1208 Test Methods for Common Properties of Certain
methyl red in 100 mL of methanol, ethanol, or isopropanol.
Pigments
E832 Specification for Laboratory Filter Papers
5.6 Sodium Carbonate Solution (30 g/L)—Dissolve 30 g of
Na CO in water and dilute to 1 L.
2 3
3. Significance and Use
6. Procedure
3.1 These test methods are used to determine the purity of
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
2 3
an aid in the manufacture of coatings.
fuse until the melt is clear. Allow the melt to cool and then
leach in a platinum dish with hot water until it is entirely
disintegrated. Filter on a close-texture paper and wash thor-
These test methods are under the jurisdiction of ASTM Committee D01 on
oughly with hot Na CO solution (30 g/L).
2 3
Paint and Related Coatings, Materials, and Applications and are the direct
responsibility of Committee D01.31 on Pigment Specifications.
Current edition approved June 1, 2020. Published June 2020. Originally
approved in 1943. Last previous edition approved in 2014 as D715 – 86 (2014). ACS Reagent Chemicals, Specifications and Procedures for Reagents and
DOI: 10.1520/D0715-86R20. Standard-Grade Reference Materials, American Chemical Society, Washington,
For referenced ASTM standards, visit the ASTM website, www.astm.org, or DC. For suggestions on the testing of reagents not listed by theAmerican Chemical
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Society, see Analar Standards for Laboratory Chemicals, BDH Ltd., Poole, Dorset,
Standards volume information, refer to the standard’s Document Summary page on U.K., and the United States Pharmacopeia and National Formulary, U.S. Pharma-
the ASTM website. copeial Convention, Inc. (USPC), Rockville, MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D715 − 86 (2020)
6.2 Transfer the filter paper containing the insoluble carbon- solution under 100 mL. Oxidize any iron present in the filtrate
ates to a 250-mLbeaker and acidify with concentrated HCl (sp by adding potassium permanganate (KMnO ) until a faint pink
gr 1.19).Wash the fusion crucible with HCl (sp gr 1.19) so that color is obtained. Dilute the solution to 100 mL and pour into
no barium is lost. Boil the solution, filter into a 600-mLbeaker, a buret graduated in 0.1-mL divisions.
and wash well with water. Add methyl red indicator solution,
10.2 Pour 100 mL of the standard color solution into a
and add NH OH (sp gr 0.90) until the solution is slightly
100-mLcolorimetrictube.Intoasecondcolorimetrictubepour
alkaline. Add 6 mL of HCl (1+1), and dilute to 300 mL.
10 mL of concentrated H SO (sp gr 1.84) and 10 mL of
2 4
6.3 Heat the solution to boiling, and add5gof(NH ) SO NH CNS, dilute to 60 or 70 mL and then add the test solution
4 2 4 4
dissolved in 40 mL of water. If low-grade material is being from the buret until the depth of color thus produced on
analyzed, the (NH ) SO solution should be added drop by dilutionto100mLexactlymatchesthatofthestandard.Record
4 2 4
drop from a buret to minimize inclusion. If the barytes is a the number of millilitres required.
rather pure product (95 to 99 % BaSO ), this is not necessary,
11. Calculation
since the only nonvolatile constituents of the solution will be
barium salts. Allow the precipitate of BaSO to digest for 4 h
11.1 Calculate the percent of Fe O
...
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