Total Kjeldahl Nitrogen
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Total Kjeldahl Nitrogen or TKN is the sum of organic nitrogen, ammonia (NH3), and ammonium (NH4+) in the chemical analysis of soil, water, or wastewater (e.g. sewage treatment plant effluent). To calculate Total Nitrogen (TN), the concentrations of nitrate-N and nitrite-N are determined and added to TKN.
TKN is determined in the same manner as organic nitrogen, except that the ammonia is not driven off before the digestion step.
The original TKN method was developed by the Danish chemist Johan Kjeldahl in 1883. Today, TKN is a required parameter for regulatory reporting at many plants but is also used to provide a means of monitoring plant operations.
[edit] See also
[edit] References
- Wastewater Engineering: Treatment and Reuse, Metcalf & Eddy
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