Ammonium in Mineral Fertilizer

Prove InstrumentsPhotometric determination using the indophenol blue method subsequent to acid extraction

Sample Preparation

Folded filter

In a mill grind down about 30 g of the sample to a fine powder and homogenize. Bring to the boil 0.5 g of the powdered material with 25 ml water for analysis and 2.5 ml hydrochloric acid 1 mol/l. After cooling filter the mixture through a folded filter, wash the filter 3 times with boiling water for analysis and collect the filtrate and the washings in a 500-ml volumetric flask. Fill up to volume with water for analysis and mix. Finally put 10 ml of this solution into a 1000-ml volumetric flask, fill up to volume and mix.


Determine with the below mentioned test kits.


Ammonium content in % NH4 = analysis value in mg/l NH4 x 10



Product 114544 is not compatible with Move 100.