Nitrate and nitrite contents in in the private ground water wells

The aim of the study was to investigation and statistical evaluation of nitrate and nitrite in ground sources of drinking water, particularly in private wells and springs in the surroundings of town Nitra, in the river basin Žitava. Samples were taken in the spring month May and the autumn month October of the same water sources. The contents of nitrate and nitrite was determined by test strips QUANTOFIX Nitrate and nitrite. The results were evaluated in the system SAS program, version 8.2. The difference of nitrate in drinking water sources between spring and autumn months was statistically evaluated by t-test. The nitrate content in drinking water samples taken from the surroundings of town Nitra, in the river basin Žitava, was measured in the spring month of May with exceeding values that exceeded the 50 mg.L-1, which is the limit value for the adult human population, in the well of municipalities Veľká Maňa, Žitavce, Michal nad Žitavou, Malá Maňa, Uľany nad Žitavou, Hul, Kmeťovo and 50 mg.L-1 was measured in spring Vlkas, in well of municipality Lúčnica nad Žitavou, Veľká Maňa, part of the Stará Hora. In the autumn month October measured nitrate content was reduced in samples taken in the municipalities Lúčnica nad Žitavou, Malá Maňa, Kmeťovo and Uľany nad Žitavou. The difference of nitrate content in water from water sources investigated in surroundings of town Nitra was not statistically significant (p >0.05) between the months May and October. The nitrite content in the same water sources in the surrounding of town Nitra was not detected.