Description
NH4-N. This method involves the quantitative analysis of ammonium (NH4-N) and nitrate (NO3-N) in water. Ammonium and nitrate are measured by the diffusion-conductivity method based on the gaseous diffusing of ammonia (NH3) across a gas permeable membrane in the presence of excess base (KOH) and subsequent conductivity detection. The method has detection limit of approximately 0.05 mg/L and is generally reproducible within 7%.