Analytical Method: Ammonium in organic fertilizer

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. 114544  Spectroquant® Ammonium Cell Test*
Cat.No. 114559  Spectroquant® Ammonium Cell Test
Cat.No. 114752  Spectroquant® Ammonium Test
Cat.No. 100683  Spectroquant® Ammonium Test
Cat.No. 109057  Hydrochloric acid 1 mol/l
Cat.No. 116754  Water for analysis
Folded filter
*not compatible with Move 100
Sample preparation:
In a mill grind about 50 g of the fertilizer sample to a fine powder and homogenize. Mix 100 mg of the powdered sample with 25 ml of water for analysis and 2.5 ml 1 mol/l hydrochloric acid and heat to 100 °C. After cooling, filter through a folded filter washing the filter several times with water, into a 1000-ml volumetric flask (filtrate and washings) and fill up to volume with water for analysis.
Determine with the above mentioned test kits.
Ammonium content in % NH4 = analysis value in mg/l NH4


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