Abstract
We monitored the content of nitrates (NO3-) in samples taken from individual groundwater resources in the cadastral territory of the city of Nitra and Zobor (Svorad’s spring, spring Šindolka and spring Buganka), also used for human consumption in the period 2012 - 2014. NO3- contents were assessed by Photocolorimetric method. We also evaluated the results achieved in relation to the current legislation in this area. The results of the performed analyzes throughout the period shows that the average concentration of NO3- represented in the samples of water from Svorad’s spring was 12,6 mg.dm-3, spring Šindolka 38,0 mg.dm-3 and spring Buganka 103,1 mg .dm-3 The nitrate concentration did not exceed the limit value in samples from spring Šindolka and spring Svorad. Spring Buganka had this value exceeded by up to 100 % of cases. We do not recommend to use water for human consumption from spring Buganka based on the measured values.
Highlights
The origin, evolution and physical - chemical characteristic of the water cover of Earth - hydrosphere is closely linked with the development of its other parts
We were assessed the content of nitrates (NO3-) in water samples taken from groundwater resources in the administrative territory of the town Nitra and Zobor, which are still used for human consumption
We obtained from the 108 experimental results that: The total content of nitrates which got into the ground water impact the environmental pollution, agricultural activity or arise nitrification activity of the bacteria ranged on average throughout the period in samples from Svorad's spring from 10,9 to 13,7 mg.dm-3, from the spring Šindolka from 39,1 to 39,9 mg.dm-3 and spring Buganka from 79,1 to 124,2 mg.dm-3
Summary
The origin, evolution and physical - chemical characteristic of the water cover of Earth - hydrosphere is closely linked with the development of its other parts. Between the earth's mantle and the earth's crust, the hydrosphere, atmosphere, lithosphere and biomass occurs constant exchange of water (Wen Ling, Saintilan, Rogers, 2009), that causes changes its chemical and isotopic composition (Harris, Hobbs, Higgs, 2006). This is called hydrological cycle, which represents a stable water cycle on Earth. An indispensable part of the hydrological cycle and a key element in maintaining wetlands and flows in rivers during dry periods is groundwater It is the part of subsurface water, which forms a continuous level in the ground and the part that fills the cavity of water-bearing rock irrespective of whether it generates or does not generate continuous level (Bekes, Moiler, 2009). Bacterial nitrate reduction (NO3-) to nitrite (NO2-) may be configured in other parts of the digestive tract other than the stomach, where it occurs only at a reduced pH (Abern, Wise, Wright, 2004) by the equation: NO3- → NO2- → H2N2O2 → NH2OH → NH3 → NH2-
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