Nitrogen determination

The Kjeldahl method is used to determine the nitrogen content of a sample. In this analysis, the sample is digested with a strong acid and the free nitrogen reacts to form ammonium sulfate.

Catalysts (tablets) are added to speed up this process. The next step is distillation followed by a titration. Several chemicals are required in this process. From acids for the digestion, to the volumetric solutions and indicators for the final titration.

Product Categories

Reagents for Kjeldahl method for nitrogen determination.

A complete range of reagents for the Kjeldahl method , ready to use avoiding potential accidents during the preparation

Kjeldahl catalysts for nitrogen determination.

A comprehensive and wide range of "ready to use" tablets to meet the optimal requirements for the sulphuric acid decomposition phase.


The Kjeldahl method is used for the quantitative determination of nitrogen contained in organic substances plus the nitrogen contained in the inorganic compounds ammonia and ammonium (NH3/NH4+) in all kinds of food or environment samples such as:

  • Meat and related product such as sausages
  • Grain and flour
  • Cocoa
  • Milk and related products (cheese and milk powder)
  • Soil
  • Water (waste and drinking) or effluents....


Additional Resource