Analytical Method: Calcium in iron ores

Instruments 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. 114815  Spectroquant® Calcium Test
Cat.No. 104885  Potassium hydrogen sulfate for analysis
Cat.No. 105588  Sodium hydroxide solution 10 % for analysis
Cat.No. 116754  Water for analysis
Folded filter
Sample preparation:
In a test tube mix about 100 mg (exactly determined) of finely powdered sampling material with 5 g of potassium hydrogen sulfate. Heat over a flame, until a clear orange-yellow melt is formed (fume cupboard!). After cooling, dissolve the melt completely in water and transfer to a glass beaker. Using a pH - meter, adjust this solution to a pH 7 - 7.5 by dropwise addition of sodium hydroxide solution 10 %. Transfer the solution to a 100-ml volumetric flask, fill up to the mark with water, and mix thoroughly. Before determination, remove all undissolved matter by filtration through a folded filter.
Determine with the above mentioned test kit.

Calcium content in % = analysis value in mg/l Ca x 10
weight of sample in mg





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