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The Kjeldhal method for the determination of organic nitrogen is the worldwide standard for the purpose of calculating the protein content in both human food and animal food. Additionally, Kjeldahl has been adapted as a standard method of nitrogen analysis in water, wastewater, fertilizer, and fossil fuels, to name a few.
The Kjeldhal method for nitrogen analysis is composed of three distinct steps. These are digestion, distillation, and titration.