Analyse of Drinking Water

Iron is a metal. The number of the iron in the Periodic Table is 26. It’s important for plants and animals,  but if there is too much it is dangerous. The contaminated water with iron has usually got bacteria of iron. This bacteria eats the minerals that are in water. This bacteria doesn't  do any problem to the human body. This bacteria leaves in water tanks pipelines. You can find iron in important minerals. If it rains the iron is removing from the minerals and it goes in to the water. Iron is important in the human body for the rain and the blood. If there is too much iron it will be stored in the liver and in other organs. But if there is too less iron you can get anaemia. Hydrolysis is a form of Ion removal, Ion Exchange an others.
Measuring Values of iron in the drinking water:
The Euronorm for iron in the drinking water is 0,2 mg/l. Our results are significantly fewer than this value. The water in all schools is okay. 
Phosphate : as an inorganic chemical is a salt of phosphoric acid. In organic chemistry is an ester of phosphoric acid. Inorganic phosphates are mined to obtain phosphorus for use in agriculture and industry. At elevated temperatures in the solid state, phosphates can condense to form pyrophosphates. All plants and trees need phosphate otherwise they will die. Farmers need to add phosphate to their crops otherwise they will die to. 
Measuring Values of Phosphate in the drinking water:
The European limit for Phosphate is 6,7 mg/l. All schools are below this limit.
Ammonium : the ammonium is a cation which reacts chemically similar such as alkali metals and salts corresponding forms forme . Ammonium forms a dissociation equilibrium with ammonia because of the involvement of oxonium is this balance of the pH -dependent.
The school in Poland is over the Europeanlimit of 0,5 mg/l. The other schools below the limit.
Nitrate salts are found naturally on the earth and is a major source of sodium nitrate. Nitrate is used in agriculture as fertilizer. Cars and industry produce nitrate too. Nitrate is importing for plants, they need it for growing. Too much nitrate in open water is not good for the plants in the water because then they grow too fast and then use too much oxygene. For a human Nitrate above 50 mg/l in the drinking water is unhealthy. 
Measuring Values of Nitrate in the drinking water:
The results of Nitrate are okay, all schools are below the european limit.
Committee Europe 2013