testingmethodsop

 Purpose: Todescribe the Laboratory Standard Operating Procedure for measurement of Ammonical Nitrogen of Water and Waste Water samples.  Scope:  Applicable to the Laboratory for analysis of water and waste water samples, where measurement of Ammonical Nitrogen is required.  Responsibility: Lab Chemist:  Analysis of sample for measurement of Ammonical Nitrogen.  Technical Manager: Review of Activity Quality Manager: Implementation and compliance of SOP.  Procedure: 1) Principle: The sample is buffered at pH 9.5 with borate buffer to decrease hydrolysis of cyanates and organic nitrogen compounds. It is then distilled into boric acid. The ammonia in the distillate is then determined titrimetrically with standard sulfuric acid or calorimetrically.  2) Instrument and Equipment: Pipettes, Conical flask, Nitrogen distillation assembly, Heating Mantle.  3) Reagents: • Sodium tetraborate 0.025M: Prepare by dissolving 9.5 g Na2B4O7. 10H2O in distilled...