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TKNstands forTotal Kjeldahl Nitrogen
Full Form of TKN
What is TKN?
TKN stands for Total Kjeldahl Nitrogen, an important analytical parameter that measures the total nitrogen concentration in a sample through a chemical digestion method originally developed by Danish chemist Johan Kjeldahl in 1883. The test quantifies organic nitrogen combined with ammonia nitrogen but does not include nitrates and nitrites, which must be measured separately. In India, TKN analysis is a standard procedure across environmental monitoring laboratories, sewage treatment plants, and industrial effluent testing facilities. The Central Pollution Control Board and various State Pollution Control Boards rely on TKN values to assess pollution loads in major rivers such as the Ganga, Yamuna, and Godavari under the Namami Gange programme and similar cleanup missions. Municipal wastewater treatment plants monitor TKN closely to optimise biological processes like nitrification and denitrification. Agricultural and soil testing laboratories also use the Kjeldahl method to evaluate nitrogen content in compost, vermicompost, farmyard manure, and other organic fertilisers. The concept is taught in environmental engineering, chemical engineering, and chemistry syllabi, making it relevant for GATE, IES, and PSC examinations.
TKN का फुल फॉर्म
कुल केल्डाल नाइट्रोजन
Example
The STP team reported that the TKN of the inlet wastewater had crossed 45 mg/L, triggering an immediate review of the biological treatment process.
TKN — frequently asked questions
What is the full form of TKN?
TKN stands for Total Kjeldahl Nitrogen, a measure of the total organic and ammonia nitrogen in a sample determined through the Kjeldahl digestion method.
Why is TKN important in wastewater treatment in India?
TKN helps operators monitor nitrogen loads, optimise nitrification and denitrification processes, and ensure treated effluents meet CPCB and state pollution control board discharge norms.
What is the difference between TKN and Total Nitrogen?
TKN measures only organic nitrogen and ammonia, while Total Nitrogen includes nitrates and nitrites as well, requiring additional testing for complete nitrogen profiling.