| 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 digestate 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. Note: per Standard Methods 4500-Norg B & C, the selective electrode method may be used for measurement of ammonia without distillation. Check with local regulators when testing for reporting purposes.
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