engleski

Concentration of Nutrients in Gaboška Vučica Surface Waters

Gaboška Vučica is a 16.118 km long tributary of Vuka River (the Markušica municipality, Vukovar- Srijem County). The part of the Vuka River between the border with Osjek-Baranja County and its confluence into the Danube River (in Vukovar) has two tributaries: the Bobota Canal, which merges with the Vuka River in Vukovar, and Gaboška Vučica, which collects water from Nuštarska Greda and Krndija mountain. Gaboška Vučica is a collector of wastewater from municipality of Markušica (an area with intensive agricultural production) and since wastewaters are usually loaded with nutrients the aim of this study was to collect and analyse concentration of nitrogen and phosphorus compounds (whose concentration in water must comply with the permissible limit values in order to avoid nutrient overload of environment and eutrophication) in surface water of Gaboška Vučica. Samples were taken once a month during 2014 and 2015. Obtained results show that during analysed period concentration of total nitrogen ranged 0.405–6.43 mg/L, concentration of nitrites 0.007–0.02 mg/L, and concentration of nitrates 0.13¬–6.1 mg/L. Concentration of orthophosphates and total phosphorus ranged 0.016–0.15 mg/L. The highest concentration of total nitrogen and nitrites was measured in the sample collected in March of 2015, while samples collected in summer months of the same year had the lowest concentration of these nutrients. The highest concentration of nitrites was measured in sample collected in October of 2014, and the lowest in July of the same year, when also the highest concentration of total phosphorus and orthophosphates was measured. Concentration of total phosphorus and orthophosphates decreases during 2015, with lowest values measured in the spring months of that year (April, May). According to current regulations in Croatia, surface water quality of Gaboška Vučica with regard to chemical parameters can be characterized as good. Further continuous monitoring of water quality is necessary in order to improve reliability of water quality categorization, for which purpose specific polluting particulate matter should also be taken into consideration.

Gaboška Vučica, nitrates, nitrites, total nitrogen, orthophosphates, total phosphates

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