Distillation Set for Determination of Ammonia

Ideal for determining Nitrogen in organic compounds.

Digestion and Distillation stages can be performed in this apparatus.

The inlet tube allows permanganate solution to be introduced after distillation.

METHOD

This distillation method covers the determination of ammonia nitrogen exclusive of total Kjeldahl nitrogen, in drinking, surface and saline waters, domestic and industrial wastes. It is the method of choice where economics and sample load do not warrant the use of automated equipment.

MEASURE RANGE

The method covers the range from about 0.05 to 1.0 mg NH3-N/L for the colorimetric procedure, from 1.0 to 25 mg/L for the titrimetric procedure, and from 0.05 to 1400 mg/L for the electrode method.

Summary of Method

The sample is buffered at a pH of 9.5 with a borate buffer in order to decrease hydrolysis of cyanates and organic nitrogen compounds, and is then distilled into a solution of boric acid. The ammonia in the distillate can be determined colorimetrically by nesslerization, titrimetrically with standard sulfuric acid with the use of a mixed indicator, or potentiometrically by the ammonia electrode. The choice between the first two procedures depends on the concentration of the ammonia