Certain features of will be down for maintenance the evening of Friday August 18th starting at 8:00 pm CDT until Saturday August 19th at 12:01 pm CDT.   Please note that you still have telephone and email access to our local offices. We apologize for any inconvenience.

Ammonium in Compost

Prove InstrumentsPhotometric determination using the indophenol blue method after extraction with calcium chloride solution

Calcium chloride solution 0.025 mol/l
Dissolve 3.68 g calcium chloride dihydrate for analysis with 1 l of water for analysis.

Sample Preparation

Charcoal activated for soil tests
Folded filter

In a glass bottle mix 50 g of naturally moist sample, free from coarse stones, with 100 ml of the calcium chloride solution. Add 1 spatula - tipfull of charcoal activated for soil tests and shake the closed bottle in a shaking machine for 1 hour (alternative: stir in a beaker). Let the suspension settle and filter through a folded filter.

For the determination of the water-content dry a similar sample to constant weight in the drying kiln at 105 °C. A drying of the sample before determination is not advisable because of the fast change in the nitrogen - forms. The analysis should take place very quickly. Storing the sample in plastic bags at room temperature changes the analysis values after a short time already.


Determine with the below mentioned test kits.


Ammonium content in mg/kg NH4 = analysis value in mg/l NH4 x 2



Product 114544 is not compatible with Move 100.