ASTM C867-94(2014)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: C867 − 94 (Reapproved 2014)
Standard Test Method for
Soluble Sulfate in Ceramic Whiteware Clays (Photometric
Method)
This standard is issued under the fixed designation C867; 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 3.4 Glass Beakers, Erlenmeyer Flasks.
1.1 This test method covers the determination of soluble
3.5 Transfer Pipets.
sulfate ions present in water or a filtrate by means of a
3.6 Spectrophotometer and accessories.
photometer measuring the turbidity of precipitated barium
sulfate. A method of standardizing the photometer for this test 3.7 Measuring Spoon, to hold approximately 0.2 g of BaCl
method is also given.
or THQ Cup.
1.2 Soluble sulfate ions may be removed from clays or
3.8 Other usual laboratory equipment, including timers, etc.
clay-water slurries by leaching with water during mixing and
subsequent filter pressing.To remove all the sulfate ions would
4. Reagents
require an impractical number of washings; therefore, this test
4.1 Purity of Reagents—Reagent grade chemicals shall be
method should be considered a control test and not a quanti-
used in all tests. Unless otherwise indicated, it is intended that
tative analysis for SO ions.
all reagents shall conform to the specifications of the Commit-
1.3 This standard does not purport to address all of the
tee onAnalytical Reagents of theAmerican Chemical Society,
safety concerns, if any, associated with its use. It is the 4
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 regent 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.
2. Referenced Documents
4.2 Purity of Water—Unless otherwise indicated, references
to water shall be understood to mean Type IV Grade reagent
2.1 ASTM Standards:
water as defined in Specification D1193.
C324 Test Method for Free Moisture in Ceramic Whiteware
Clays
4.3 Barium Chloride (BaCl ·H O) crystals, 20 to 30 mesh.
2 2
D1193 Specification for Reagent Water
4.4 Salt-Acid Reagent—However, it can be prepared from:
2.2 American Chemical Society Document:
23.6 ml HCl, 253.0 gm NaCl, 976.4 ml distilled water. This
Specification for Reagent Chemicals
solution should be stored in an automatic pipettor for accurate
measurement.
3. Apparatus
3.1 Balance, accurate to 0.0001 g. 4.5 Glycerine Reagent—a mixture of equal volumes of c. p.
glycerine and reagent grade water or it may be purchased from
3.2 High-Speed Mixer.
a laboratory supply house. This solution should be stored in an
3.3 Filter Press, capable of operating at 690 kPa (100 psi).
automatic pipettor for accurate measurement.
4.6 Standard Sulfate Solution—a solution of c. p. sodium
ThistestmethodisunderthejurisdictionofASTMCommitteeC21onCeramic
sulfateinreagentgradewaterataconcentrationwhichcontains
Whitewares and Related Products and is the direct responsibility of Subcommittee
exactly 100 ppm of sulfate ion.
C21.04 on Raw Materials.
Current edition approved Jan. 1, 2014. Published February 2014. Originally
approved in 1977. Last previous edition approved in 2007 as C867 – 94 (2007).
DOI: 10.1520/C0867-94R14.
2 4
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Reagent Chemicals, American Chemical Society Specifications , American
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Chemical Society, Washington, DC. For suggestions on the testing of reagents not
Standards volume information, refer to the standard’s Document Summary page on listed by the American Chemical Society, see Analar Standards for Laboratory
the ASTM website. Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
Available from American Chemical Society, 1155 16th Street, NW, and National Formulary, U.S. Pharmaceutical Convention, Inc. (USPC), Rockville,
Washington, DC 20036. MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C867 − 94 (2014)
5. Standardization of Apparatus 6.5 Pressure is applied gradually until 100 psi is obtained.
Filtrate is caught in an Erlenmeyer flask. To eliminate errors
5.1 It should be noted that the instrument requires about 30
from initial turbidity, the first 5 ml of filtrate is discarded.
min to warm up. Keep a blank cell in the instrument when a
sample is not in the holder. For SO determination, the filter
6.6 Prepare the filtrate for testing by carefully transferring
wavelength should be set at 550 nm.
the desired quantity of filtrate from the Erlenmeyer flask to a
clean 30 ml beaker using the appropriate pipette. A25 ml total
5.2 Using the appropriate pipettes, measure 25 ml of the
sample is used for testing; this sample may be comprised of
standard100ppmsolutionintoa125mlErlenmeyerflask.Add
between 1 ml and 25 ml of filtrate depending on the sulfate ion
5 ml of glycerine reagent and
...