Analytical Method: Phosphate in fertilizers

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. 100616  Spectroquant® Phosphate Cell Test
Cat.No. 114848  Spectroquant® Phosphate Test
Cat.No. 100798  Spectroquant® Phosphate Test
Cat.No. 109072  Sulfuric acid 0.5 mol/l
Cat.No. 116754  Water for analysis
Sample preparation:
Finely ground about 30 g of the sample in a mill and homogenize it. Weakly boil 0.5 g of the ground sample with 25 ml sulfuric acid 0.5 mol/l for 15 minutes. Filter off the insoluble parts and wash the filter 3 times with water for analysis. Put the filtrate and the washings into a 1000-ml standard volumetric flask, fill up to volume with water for analysis and mix well.
Determine with the above mentioned test kits.

Phosphate content in %    =     analysis value in mg/l PO4





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