Environmental samples such as soil, water, wastewater, or sludge can be analyzed with Total Kjeldahl Nitrogen (TKN) analysis.
TKN determination of soil provides valuable information about optimizing and reducing the amount of fertilizer required. By decreasing the amount of fertilizer, the environment is protected, and costs can be saved. Furthermore, the quantitative study of plant nitrogen helps to assess the fertilizer use efficiency and to select the most appropriate fertilizer source for the farming community used for quality control.
TKN is also a standard parameter used to evaluate pollution in water; it is a proven routine procedure used to ensure water quality.
Samples for TKN require digestion with sulfuric acid to convert nitrogen into ammonium sulfate. After conversion to ammonia through alkalization with sodium hydroxide, the ammonia is distilled into a boric acid receiver via steam distillation. The quantification of nitrogen is achieved by subsequent titration with sulfuric acid solution.
Assessing the Impact of Drought Stress and Soil Cultivation in Chardonnay and Xynisteri Grape Cultivars
Chrysargyris, A.; Xylia, P.; Litskas, V.; Stavrinides, M.; Heyman, L.; Demeestre, K.; Héfte, M.; Tzortzakis, N. Agronomy 2020, 10, 670
https://www.mdpi.com/2073-4395/10/5/670
Comparison of different treatment methods for protein solubilisation from waste activated sludge
Effect of black alder (Alnus glutinosa) admixture to Scots pine (Pinus sy/ivestris) plantations on chemical and microbial properties of sandy mine soils
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