Analytical Method: Phosphorus (total) in iron oxide powder

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. 114543  Spectroquant® Phosphate Cell Test
Cat.No. 114729  Spectroquant® Phosphate Cell Test
Cat.No. 114848  Spectroquant® Phosphate Test
Cat.No. 100716  Sulfuric acid 25 % for analysis
Cat.No. 106495  Sodium hydroxide for analysis
Cat.No. 109535  MColorpHastTM Universal Indicator strips pH 0 - 14
Cat.No. 116754  Water for analysis
Iron oxide powder with an average size of particles of 0.2 - 0.3 μm is used for the production of ferrite cores. Mineral and oxidic admixtures or contaminations are decisive for the quality of the endproduct.
Sample preparation:
In a nickel melting-pot mix 100 mg of the sample, dried to constant weight at 105 °C, with 8 sodium hydroxide tablets for analysis (1.5 g). Directly with the gas burner heat the covered melting-pot to weak red glow for
30 minutes. After cooling dissolve the content of the melting-pot in water for analysis. For that purpose put the melting-pot with the cover into a glass beaker as well as 30 - 50 ml water for analysis, warm on a bath of water, until the melting cake has dissolved. Adjust the suspension to a pH-value of 7 - 8 with sulfuric acid 25 % (check with Universal indicator strips pH 0 - 14), quantitatively transfer it into a 200-ml standard volumetric flask and fill up to volume with water for analysis. After mixing let the insoluble parts settle and filter the supernatant solution through an ash-free, acid washed filter. A blank reading analysis must be considered, made with the used reagents according to the procedure above.
Determine with the above mentioned test kits.

Phosphorus (total) content in % P2O5   =   analysis result in mg/l P2O5 x 20
weight of sample in mg




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