engleski

Nitrate concentration in drinking water from wells at three different locations in Northwest Croatia

Data from three locations were used for this research: Kalnik, Krizevci and Koprivnica. Area of Kalnik is presented with 400 m deep water well (L1) without any influence of agriculture or urbanisation on nitrate concentration in exhausted water. Water samples from this location were used as a control for comparison of nitrate concentration in water from other 2 locations. Water samples from 2 wells in suburb of Krizevci (L3 i L4) represent an area with possible influence of agriculture. Area of Koprivnica is presented with 3 wells that are located mainly in area of intensive agricultural production (L2, L5 and L6). Water wells from location Krizevci and Koprivnica are shallow (10 – 50 m). Ground water samples were collected weekly on described locations (L1-L6) in the period from April 1st 2005 to April 1st 2006. The findings confirm that nitrate concentrations in water samples from wells in 3 different locations in Northwest Croatia are significantly different. The highest average nitrate concentration of 28.7 mg L-1 NO3- is related to location Koprivnica, which is the area of intensive agricultural production. At location Krizevci wells are located at suburban area and average nitrate concentration is 26.5 mg L-1 NO3-. Compared to this two values significantly lower average concentration of 4.6 mg L-1 NO3- is determined at location Kalnik in water samples without any influence of agriculture and urbanisation.

Ground water; nitrate concentration; agriculture; influence

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