VOLUMETRIC DETERMINATION OF S03 IN CALCIUM SULFATES
CATION EXCHANGE RESINS ARE USED FOR LABORATORY DETERMINATION OF THE SULFUR TRIOXIDE CONTENTS OF ANHYDRITE, GYPSUM AND HEMIHYDRATE. WHEN A WATER SUSPENSION OF ONE OF THESE FORMS OF CALCIUM SULFATE AND A CATION EXCHANGE RESIN IS BOILED, THE CALCIUM ION IS TAKEN UP BY THE RESIN AND REPLACED BY HYDROGEN ION FROM THE RESIN. THIS YIELDS A SOLUTION OF SULFURIC ACID WHICH CAN BE TITRATED FOR ACID CONTENT WITH A STANDARD SOLUTION OF SODIUM HYDROXIDE. ALL SALTS OF STRONG ACIDS ARE CONVERTED TO THEIR ACIDS BECAUSE THE PRESENCE OF SALTS IN SIGNIFICANT AMOUNTS WILL INTERFERE WITH THE USE OF THIS METHOD. THE LABORATORY METHOD IS EXPLAINED IN DETAIL AND EVIDENCE SHOWS THE PRECISION OF THE METHOD TO BE WITHIN 0.5 PERCENT IN DUPLICATE DETERMINATIONS WHILE THE ACCURACY, BASED ON PER CENT SULFUR TRIOXIDE IN CALCIUM SULFATE FOUND BY BARIUM SULFATE PRECIPITATION AND THAT FOUND BY TITRATION IN THE ION EXCHANGE METHOD TO BE WITHIN 1 PERCENT.
- Publication Date: 1966
Media Info
Subject/Index Terms
- TRT Terms: Boiling; Calcium compounds; Cation exchange; Ion exchange; Laboratory tests; Resins; Sodium hydroxide; Sulfur compounds; Sulfuric acid; Volumetric analysis; Water
- Old TRIS Terms: Exchangeable ions
- Subject Areas: Highways; Materials;
Filing Info
- Accession Number: 00212392
- Record Type: Publication
- Files: TRIS
- Created Date: Jan 20 1970 12:00AM