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This method covers the determination of total Kjeldahl nitrogen in drinking, ground, and surface waters, domestic and industrial wastes. The procedure.PDF | The Kjeldahl method was introduced in 1883 and consists of three main steps: sample digestion, distillation, and ammonia determination (titration. The Kjeldahl method is a means of determining the nitrogen content of organic and inorganic substances. Although the technique and apparatus have been altered. This draft method has been reviewed and approved for publication by the Analytical Methods Staff within the Engineering and Analysis Division of EPA. The Kjeldahl Method may be broken down into three main steps: Digestion. Distillation. Titration This is the most time-consuming step of the analysis.