1. Method Principle
In an alkaline medium (pH = 11.7) in the presence of sodium nitroferricyanide, ammonia and ammonium ions in water react with salicylate and hypochlorite ions to form a blue compound. The absorbance of this compound is measured at 697 nm to quantify the ammonia nitrogen content.
2. Scope of Application
Requirements of the analytical method for ammonia nitrogen in water quality
3. References
HJ 536-2009 Water quality — Determination of ammonia nitrogen
