1.1 This test method covers the determination of soluble sulfate ions present in water or a filtrate by means of a photometer measuring the turbidity of precipitated barium sulfate. A method of standardizing the photometer for this test method is also given.
1.2 Soluble sulfate ions may be removed from clays or clay-water slurries by leaching with water during mixing and subsequent filter pressing. To remove all the sulfate ions would require an impractical number of washings; therefore, this test method should be considered a control test and not a quantitative analysis for SO4 ions.
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.
ASTM C867-94(2022) Referenced Document
ASTM C324 Standard Test Method for Free Moisture in Ceramic Whiteware Clays
ASTM D1193 Standard Specification for Reagent Water
ASTM C867-94(2022) history
2022ASTM C867-94(2022) Standard Test Method for Soluble Sulfate in Ceramic Whiteware Clays (Photometric Method)
1994ASTM C867-94(2014) Standard Test Method for Soluble Sulfate in Ceramic Whiteware Clays 40;Photometric Method41;
1994ASTM C867-94(2007) Standard Test Method for Soluble Sulfate in Ceramic Whiteware Clays (Photometric Method)
1994ASTM C867-94(2000) Standard Test Method for Soluble Sulfate in Ceramic Whiteware Clays (Photometric Method)
2000ASTM C867-94 Standard Test Method for Soluble Sulfate in Ceramic Whiteware Clays (Photometric Method)