Analytical Method: Manganese (total) in iron oxide pigments

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. 100816  Spectroquant® Manganese Cell Test
Cat.No. 114770  Spectroquant® Manganese Test
Cat.No. 101846  Spectroquant® Manganese Test
Cat.No. 104885  Potassium hydrogen sulfate for analysis
Cat.No. 105092  Potassium peroxodisulfate for analysis
Cat.No. 106392  Sodium carbonate for analysis
Cat.No. 101512  Silver nitrate for analysis
Cat.No. 116754  Water for analysis
Sodium carbonate solution 20 %, hydrous solution:
Dissolve 20 g sodium carbonate in 100 ml water for analysis.
Silver nitrate 0.2 %, hydrous solution:
Dissolve 0.2 g silver nitrate in 100 ml water for analysis.
Sample preparation:
Depending on the expected content of manganese mix 100 - 250 mg of the sample, dried to constant weight at 105 °C, with 2.5 g potassium hydrogen sulfate in a Duran- or Pyrex test tube. In the tube melt the salt mixture by heating it with a rustling gas flame, until the melting looks orange red and clear (about 5 minutes).
After cooling dissolve the salt melting with some water for analysis in a glass beaker in a bath of hot water and transfer quantitatively into a 200-ml Erlenmeyer flask with water for analysis. Add 0.5 g potassium peroxodisulfate and 0.5 ml silver nitrate solution 0.2 % in water and boil it for 30 minutes, keeping the volume. After cooling add 10 ml sodium carbonate solution 20 % in water, transfer it into a 100-ml volumetric flask, fill up to volume with water for analysis and mix. After the iron hydroxide deposit has settled, use the clear project in the flask for the determination of manganese.
Determine with the above mentioned test kits.

Manganese (total) content in % = analysis value in mg/l Mn x 10
weight of sample in mg





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