Operational quality performance Check: Nitrogen determination in reference substance

Performance check with a reference substance is a key element in qualifying a distillation unit in anoperational qualification (OQ)procedure. To verify the Kjel Line and MultiDist instrumentsthe nitrogen content of dry ammonium dihydrogen phosphatemonobasicisdeterminedaccording to Kjeldahl method. Direct distillation with the steam distillation unit MultiDistwas followed by boric acid titration on the Metrohm Eco Titrator. Alternatively, manual titration with/without a titrator could also be performed toquantify the distilled Nitrogen content.

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