Investigation of drinking water quality from the individual wells from the Dubravica village in Braničevo district

Abstract

The water quality of drinking water: physico-chemical and microbiological safety of the individual wells from the Dubravica village was investigated with the methods recommended by Regulations of hygienic quality of drinking water. The method of indirect determinations was used for testing the content of heavy metals in drinking water based on the scale sedimented on the house water heater. The scale was exanimated with scanning electron microscopy (SEM), X-ray diffraction analysis (XRD) and the method of thermogravimetric (TG) and differential thermal analysis (DTA). Physico-chemical and microbiological examinations have shown that the drinking water from individual wells are completely safe for use. The results of heavy metals contents showed that the indirect method is more precise and more reliable because it can detect the concentration of heavy metals (in the examined samples of Cd and Pb) that are below the threshold of detection by classical methods of water analysis. This is very important because, in this way, the use of heavy metals is monitored in long period of time and it can prevent potential effects on human health. The uranium content is below the allowed value prescribed by law, but the method of fractional extraction points to its anthropogenic origin.

Kvalitet vode za piće: fizičko-hemijska i mikrobiološka ispravnost iz individualnih bunara iz sela Dubravica proverena je metodama preporučenim Pravilnikom o higijenskoj ispravnosti vode za piće. Sadržaj teških metala u vodi za piće utvrdjen je metodom indirektnog određivanja na osnovu kamenca istaloženog na grejaču kućnog bojlera. Dobijeni kamenac ispitivan je skenirajućom elektronskom mikroskopijom (SEM), rendgenskom difrakcionom analizom (RDA) i metodom termogravimetrijske (TG) i diferencijalne termičke analize (DTA). Fizičko-hemijska i mikrobiološka ispitivanja ukazala su na potpunu zdravstvenu ispravnost vode za piće. Rezultati sadržaja teških metala pokazali su da je indirektna metoda preciznija i pouzdanija, jer može detektovati koncentracije teških metala (u ispitivanim uzorcima Cd i Pb) koji se nalaze ispod praga detekcije klasičnim metodama analize vode. Ovo je veoma bitno jer se na taj način prati njihovo unošenje u dužem vremenskom periodu i mogu se preduprediti eventualne posledice po zdravlje ljudi.Sadržaj urana je ispod zakonom dozvoljene vrednosti, dok metoda frakcione ekstrakcije ukazuje na njegovo antropogeno poreklo.