Analytical Method: Sulfate in building materials

Instrument and Reagents:

Cat.No. 173016  Spectroquant® VIS Spectrophotometer Prove 100 or

Cat.No. 173017  Spectroquant® UV/VIS Spectrophotometer Prove 300 or

Cat.No. 173018  Spectroquant® UV/VIS Spectrophotometer Prove 600 or

Cat.No. 109748  Spectroquant® Photometer NOVA 30 or

Cat.No. 109751  Spectroquant® Photometer NOVA 60 or

Cat.No. 173632  Spectroquant® Colorimeter Move 100

Cat.No. 114946  Rectangular cells 10 mm and/or

Cat.No. 114947  Rectangular cells 20 mm and/or

Cat.No. 114944  Rectangular cells 50 mm
Cat.No. 114548  Spectroquant® Sulfate Cell Test
Cat.No. 100617  Spectroquant® Sulfate Cell Test*
Cat.No. 114564  Spectroquant® Sulfate Cell Test
Cat.No. 114791  Spectroquant® Sulfate Test*
Cat.No. 106498  Sodium hydroxide for analysis
Cat.No. 100456  Nitric acid 65 % for analysis
Cat.No. 109535  MColorpHastTM Universal indicator strips pH 0 - 14
Cat.No. 116754  Water for analysis
  
*not compatible with Move 100
    
Differential analysis of sulfate soluble in hot water and total sulfate can be carried out with suitable sample preparation.
 
Sample preparation - hot water extraction:
Prepare a fine powder of the sample and dry at 105 °C. Mix 5 g with 100 ml of water for analysis and boil for
30 minutes on a hot plate. Allow to cool, transfer the suspension to a 200-ml volumetric flask and make up to the mark with water for analysis. Mix well, filter through a paper filter and then use as sample for the determination of water-soluble sulfate.
 
Sample preparation - total content:
Mix 100 mg of the finely powdered material along and 10 pellets of sodium hydroxide, place in a nickel crucible and heat for 30 minutes at 550 °C in a muffle furnace. Allow to cool and carefully add 10 ml water for analysis. If necessary, heat gently to obtain a suspension. Adjust to approximately pH 5 with nitric acid. Using water for analysis, transfer the suspension to a 100-ml volumetric flask, make up to the mark with water for analysis and mix well. Filter through a paper filter before carrying out the analysis.
 
Analysis:
Determine with the above mentioned test kits.
 
Calculation:
Sulfate (water-soluble) content in % = analysis value in mg/l x 0.004
Sulfate (total) content in % = analysis value in mg/l x 0.1

Materials

     
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