Kjeldahl method for the determination of organic Nitrogen is the world wide standard for the purpose of calculating the Nitrogen and Protein content in both human food and animal feed. Kjeldahl method has been adopted as a standard method of nitrogen analysis for many non Protein materials, Nitrogen analysis of water, waste water, fertilizer fossil fuel, etc.

The Method kjeldahl developed for Nitrogen analysis consist of three phases.

• Digestion
• Distillation
• Titration.