Ammonia and Total Kjeldahl Nitrogen

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Ammonia-Selective Electrode• >pH 11 and gas-permeable membrane• “Sample distillation is unnecessary.” SM 22 nd Ed.• Table 1B: Footnote 6. Distillation may be required ifany questions arise
Distillation• Manual distillation is not required if comparability data on representativeeffluent samples are on file to show that this preliminary distillation step isnot necessary: however, manual distillation will be required to resolve anycontroversies. In general, the analytical method should be consultedregarding the need for distillation. If the method is not clear, the laboratorymay compare a minimum of 9 different sample matrices toevaluate the need for distillation. For each matrix, a matrix spike andmatrix spike duplicate are analyzed both with and without the distillationstep. (A total of 36 samples, assuming 9 matrices). If results arecomparable, the laboratory may dispense with the distillation step forfutureanalysis. Comparable is defined as < 20% RPD for all tested matrices).Alternatively the two populations of spike recovery percentages may becompared using a recognized statistical test.2012 MUR, Table IB, footnote 6.
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Page 3 and 4: Ammonia Methods• Titration• Ion
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Page 11 and 12: Automated Phenate• Continuous Flo
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Ammonia and Total Kjeldahl Nitrogen

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