摘要：In this study were analyzed water samples in terms of the content of nitrites, nitrates, ammonia collected from Ialomita river. The human or animal concentrations determine the accumulation of nitrogenous substances, represented by dejection wastewater and many other categories of waste from human activities. On land, the balance between NO 3 - and NH 4+ is achieved when NO 3 reaches about 150 mg N/g, and in fallow areas balance is 24 mg N/g. The most amounts of nitrogen accumulates in plants. Some plants contain about 500 times more nitrogen than soil reserves. Non-metals and anorganic anions are pollutants that cause environmental problems because they are used in large quantities as anions (nitrates and phosphates). The nitrate fertilizers are used extensively in the agriculture. During the growing, many fertilizers applied are absorbed by plant roots, and when growth ceases, nitrates released during the decomposition of plants go into the ground and can enrich adjacent watercourses. Increasing the amount of nitrogen causes algae populations flowering effect, called eutrophication, that often leads to the destruction of microorganisms by oxygen released from algal tissue death. The nitrite content is reduced significantly after wastewater treatment with 31,81% and nitrate content decreases with 31,45%. The water samples from Ialomita river demonstrates that, after performing wastewater treatment, the content of nitrates and nitrites is below the acceptable limits of law namely 10 mg/l for nitrates and 0,009 mg/l for nitrites.
