Ammonium in Organic Fertilizer

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

Sample Preparation

Folded filter

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 below mentioned test kits.


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



Product 114544 is not compatible with Move 100.