TKN tutorial – What is the difference of ammonia and ammonium

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Johan Kjeldahl developed in 1883 a method for the quantitative determination of nitrogen contained in organic substances and inorganic substances – ammonia NH3 and ammonium NH4+. He named the sum of all measured nitrogen TKN – total kjeldahl nitrogen. TKN plus Nitrate Nitrogen (NO3-), Nitrite Nitrogen (NO2-) and Nitrogen gas (N2) can be summarized in […]