Quality of groundwater in the groundwater body SK1000600P abstract /

Tyt. z nagłówka.Bibliogr. s. 538.The accession of Slovak Republic to the European Union created a commitment and a duty to implement the European Parliament Directive 2000/60/EC that sets the framework for the Community action in the field of water policy. Within the scope of this implementation, 101 groundwater bodies were established, 16 are in the Quaternary sediments, 59 in of pre-Quaternary sediments and 26 in geothermal settings. Seven Quaternary bodies were classified during evaluation chemical analyses as having a bad chemical state (Kuniková et al. 2005, Kullman et al. 2006). We focus on one of these groundwater bodies, namely on SK1000600P. SK1000600P is located in the South-Eastern part of the Podunajská nižina and covers an area of 515 km2. The groundwater collection in the SK1000600P body consists of alluvial and terrace gravels, sandy gravels and sands. Fluvial sediments of river floodplains and terraces belobg to the most water-saturated beds. Hydrogeological character depends on the granulometric composition, width and position in regards to the surface flow. The rest of Quaternary sediments being to low impermeable aquifers. The hydrogeological collectors possess predominant intergranular permeability. The average width of aquifer is < 10 m (Vaskovsky et al. 1982). The general direction of flow of underground water in the alluvial floodplain of the Quaternary body is more or less parallel with the main flow (Malik et al. 2005). The quality of groundwater SK1000600P formation was analysed based on chemical analyses from seven observatory boreholes (Hurbanovo-Maly Vek, Iza-Bokros, Komarno-Komocin, Iza, Moca and Kravany) of the Slovak Hydrometeorological Institute network, during the 2002-2010 time period. The current state was evaluated based on threshold values (the Decree of the Government of the Slovak Republic 282/2010) and limit values (the Decree of the Government of the Slovak Republic 496/2010). The basic chemical composition of the groundwater varies. The calcium and magnesium are considered dominant with sodium also having a significant presence. In the anion spectrum carbonates can be considered dominant, the influence of the secondary pollution is reflected in a significant share of sulphates. According to the Palmer-Gazda classification, the groundwater body contains groundwater of the basically distinct Ca-Mg-HCO3 type up to the basically indistinct Ca-SO4 type. The overall TDS falls into the range from 0.6 g·L-1 to 1.4 g·L-1. When analysing the parameters of the groundwater quality we found out, that the most polluted groundwater comes from the boreholes Iza-Bokros and Iza that feature an increase over the threshold limit values for Na+, NH4+, Fe, Mn, Cl- a SO42-. It should be noted, that for example the primary origin of sulfates cannot account for such high concentration which means that it was most probably caused by anthropogenic activity.Dostępny również w formie drukowanej.KEYWORDS: water policy, Podunajska nizina, Slovak Hydrometeorological Institute