Under the term ammonia it alludes on unionizable (NH3) and ionizable (NH4 ) shape. Natural level in underground and surface waters is below 0.2 mg/l. Anaerobic underground waters can content 3 mg/1 of iron. Intensive nurture of animals on farms can give appreciably higher level of ammonia in surface waters. Ammonia in water is indicator of possible bacteria activity, animal waste and waste from sewage.
Origin in water
Ammonia in underground waters can be present as result of chemical and biological processes. Biological processes are happened in presence of denitrification bacteria in anaerobic conditions. Expanded concentrations of this ion are significant in underground waters of deep artesian wells, in the areas of naphtha and gas appearances. Ammonia ion can be also inorganic origin.
Ammonia in water for drink is not immediately important for health and because of that recommended value is not prescriptive.
Ammonia is the main component in metabolism of mammals. Toxic effects are noticed only during exposure of large concentration over 200 mg/kg corporal mass.
Ammonia makes problems in water taste and odour, which preclude water usage.
Maximal allowable concentrations
According to recommendations of EU, limitary value for ammonia is 0, 5 mg/l NH4 (Directive 98/83/EC). Exception for geogene overflow is not foreseen. According to our rules for drinking water (Sl. list SRJ 42/98), limitary value for ammonia is 0,1 mg/1, and for plumbing to 5000 ES of 1 mg/1.