What instruments are required to measure ammonia nitrogen in water?

　　Nitrogen in aquatic systems, as the primary driver of eutrophication, is often a key focus of research and engineering efforts in the water‑pollution‑control sector, with its significance rivaling that of organic pollutants.

　　1. What is ammonia nitrogen?

　　Ammonia nitrogen refers to ammonia present in the form of free ammonia (also known as non-ionized ammonia, NH3) or ionized ammonium (NH4+). At higher pH levels, the proportion of free ammonia is greater; conversely, at lower pH levels, the proportion of ammonium ions is higher.

　　Ammonia nitrogen is a nutrient in aquatic systems that can trigger eutrophication; it is a major oxygen‑depleting pollutant and is toxic to fish and certain aquatic organisms.

　　The primary form of ammonia nitrogen that poses a hazard to aquatic organisms is free ammonia, which is tens of times more toxic than ammonium salts and its toxicity increases with rising alkalinity. Ammonia‑nitrogen toxicity is closely linked to the pond water’s pH and temperature; generally, the higher the pH and water temperature, the greater the toxicity.

　　Two colorimetric methods commonly used to determine ammonia are the classic Nessler’s reagent method and the phenol–hypochlorite method; titrimetric and electrode‑based methods are also frequently employed. When ammonia nitrogen concentrations are high, the distillation–titration method may be applied as well. (The national standards specify the Nessler’s reagent method, the salicylic acid spectrophotometric method, and the distillation–titration method.)

　　2. What instruments are required to measure ammonia nitrogen in water?

　　Ammonia Nitrogen Analyzer

　　I. Product Applications:

　　The ammonia‑nitrogen analyzer is suitable for detecting ammonia‑nitrogen concentrations in large, medium, and small water treatment plants, as well as in industrial and mining enterprises and in domestic or industrial water supplies, thereby enabling control of ammonia‑nitrogen levels to meet prescribed water quality standards.

　　II. Technical Specifications:

　　Measurement range: 0–10 mg/L

　　Minimum display value: 0.001 mg/L

　　Repeatability: ≤2%

　　Basic error: ≤±5%FS

　　Power supply voltage: DC 9V