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ANTHROPOGENIC INFLUENCE ON GROUNDWATER QUALITY: A CASE OF NITRATEPOLLUTIONVesna Ristić Vakanjac 1 , Petar Papić 1 , VesnaDamnjanović 1 , Radoslav Golubović 21School of Maning and Geology, Institute of Hydrogeology,University of Belgrade, Serbia2 Petnica Research Station, Valjevo, SerbiaApstract: During complex hydrogeological and hydrochemicalinvestigations of karst groundwaters in Valjevo town (WesternSerbia), increased concentrations of nitrates were established inkarst groundwaters. In 1991 have started daily regime observationsof groundwater quality and quantity as well as atmosphericprecipitations. The hydrochemical determinations were done withstandard methods in situ. On the basis of 600 atmosphericprecipitation and around 2200 groundwater samples, the positivetrend of nitrates in karst groundwaters was noticed. The results ofstatistical analyses have shown on influence of anthropogenic factorsin negative as well as positive sense (reduction of industrial activitiesdue to war actions and beginning of international sanctions).Key words: karst groundwater/ geochemistry/ statistic analyses/pollution/ nitratesUVODPrvi stadijum formiranja hemijskog sastava površinskih ipodzemnih voda se odvija u atmosferi, pa je zbog toga potrebnoizučavanje hemijskog sastava atmosferskih taloga, koji se menja uprostoru i vremenu. U poslednje vreme raste interesovanje zaispitivanjem zagađenja i porekla nitrata u vodama. Sa druge strane,ova komponenta se nalazi su među glavnim zagađivačima atmosfereurbanih sredina (oksidi azota i sumpora).~ 162 ~