Abstract
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.
Highlights
The European Charter on Water, which was announcedMay 6, 1968 in Strasbourg, including the text, which is important for the understanding of water protection, and that there is no life without water and the water pollution is harmful to humans, so water resources need to be examined, checked and, if necessary, taken measures for their improvement.The European Food Safety Authority – dietetic products, nutrition and allergies (NDA) (EFSA, 2010) elaborated on the request of the European Commission a scientific opinion on the reference water intake
We present in this chapter the results of verification of the contents of nitrates and nitrites that we measured in the samples of water from wells and springs
In the Figures we present the results of nitrate content in water samples taken in May and October 2015 by individual water sources that are documented in the Figure with that brief description
Summary
The European Food Safety Authority – dietetic products, nutrition and allergies (NDA) (EFSA, 2010) elaborated on the request of the European Commission a scientific opinion on the reference water intake. Water is consumed from diverse sources, which include drinking water (from the faucet and bottled water), water in foods, drinks, water from the oxidation of nutrients in the human body. Water intake from foods and drinks can be defined as the total water intake, the sum of total water intake and water from the oxidation of nutrients is the overall disposition of water. Nitrates and nitrites are naturally occurring ions that are part of the nitrogen cycle. The nitrate ion (NO3–) is a stable form. Nitrite ion (NO2–) containing nitrogen in a relatively unstable oxidation state. Chemical and biological processes may further change nitrite into various compounds or oxidize it into nitrate
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