| Total Kjeldahl Nitrogen is the sum of organic nitrogen and ammonia in a sample, which are converted to ammonium by digestion in sulfuric acid, potassium sulfate and cupric sulfate solution. Distill before analysis if necessary for reporting purposes. Ammonia in the distilled sample is measured directly by adding base and using the 9512HP electrode with an Orion Star meter to obtain the Total Kjeldahl Nitrogen in the sample. See Electrode Log #40 for direct analysis of the digestate.
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