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Comparative analysis between bottled and tap waters as well as its comparison with current Serbian regulations, European Union Directives and World Health Organization standard are shown in this paper. Thirteen bottled waters and fourteen tap waters from the territory of Serbia were analyzed in the Federal Institute for Geosciences and Natural Resources (BGR) laboratory in Berlin, for the purpose of the “Geochemistry of European Bottled Water“ project conducted by EuroGeo Survey Geochemistry (EGS). Macrocomponents (main cations and anions) of ground waters usually reflect on lithogeochemistry of the aquifer, while microcomponents indicate the circulation of ground water through the different lithological environment. Analyzed bottled waters could be classified as those with low mineral content (M<500 mg/L) if HCO3 anion and Ca and Mg cations were the prevailing ones, or mineral (M>500 mg/L) with prevailing HCO3 anion and Na cation. Waters with low mineral content were mainly from limestone and dolomite, while mineral waters mainly originated from magmatic and metamorphic rocks. Higher content of Cs, Li, Ge, Rb and F in bottled waters indicates the importance of the magmatic intrusions influence on their chemical composition. In some waters higher content of B, I, NH4, as well as of Tl and W has been observed which can be attributed to water’s circulation through different lithological complexes. Tap water was mostly obtained from groundwater (from Neogen and alluvial aquifers and karst springs) with rest being those of rivers and surface accumulations. Tap waters from Central Serbia were with low mineral content, with prevailing HCO3 anion and Ca and Mg cations, while waters from Vojvodina, the northern province of Serbia, were with higher mineralization, HCO3-Na. Chemical analyses of the sampled tap waters showed good quality, with exception of waters from the cities of Senta and Zrenjanin in Vojvodina. High values of B (1170 and 895 g/L), As (20.9 and 71.9 g/l), Na (208 and 275 mg/L), as well as EC (715 and 928 S/cm) have been registered in these waters

The crystal structure of ludwigite from Vranovac ore deposit (Boranja Mt., Serbia) was refined using the X‐ray powder diffraction (XRPD) Rietveld method in the space group Pbam to a final RB=7.45% and RF=5.26%. It has the unit cell dimensions of: a= 9.2515(2) Å; b= 12.3109(2) Å; c= 3.03712 (7) Å; and V= 345.91(1) Å3. The calculated distances and angles are mostly in good agreement with the Mg2+‐Fe2+ substitutions across the M(1) and M(3) sites, as well as with the Fe3+‐Al3+ replacement in the M(4) site. However, the mean observed M(2)‐O distance is considerably shorter than prescribed, due to a slight increase of the Fe3+ content in the M(2) site. Such replacement was compensated by slight increase of the Fe2+ content in the M(4) site, resulting in the (Mg1.48Fe2+0.46Fe3+0.05Mn0.02)2.01 (Fe3+0.94Fe2+0.04Al0.02)1.00B1.00O5 composition. The formation temperature was estimated to be about 500–600°C. The influences of the various chemical compositions to the crystallographic parameters, M‐O distances, M(3) and M(4) sites shift, distortion parameters and estimated valences, were also studied and compared with other reference samples.

Avala Mountain is accommodated 15 km southward from the city of Belgrade and extends over the area of about 10 km2. Avala Mountain is a cultural and historical heritage of Belgrade qualified by the Law on Environmental protection. The area is abundant with water springs that have been exploited by tourist facilities and local population. By analyzing groundwater sampled from several springs and wells located in a vicinity of the Avala magmatic entity here we study the occurrence, concentration and origin of arsenic pollutant. The investigated springs are accommodated within the faulted complex of Mesozoic carbonate and clastic sediments, serpentinite, further intruded by the Tertiary magmatic rocks. By using the concentrations of the major and minor components(e.g. Cr, Ni, Fe, Mn) in groundwater, the relationship between groundwater and local lithostratigraphic units is outlined. Chemical analysis of the investigated waters shows that arsenic concentration in groundwater of the investigated area is in range from 3.0 to 102.0 ?g/l. Arsenic concentrations over the maximum allowed value in drinking water (10 ?g/l] are detected in more than 55% cases. The occurrence of arsenic in groundwater can be attributed to local igneous rocks, i.e. to the process of oxidation of sulphide minerals with As (major or minor presence] - primarily arsenopyrite or pyrite. Groundwater with higher concentration of arsenic (above 10?g/l] is exploited as drinking water used by tourists and by local population. Along term use of the water with high concentration of arsenic impose a major health risk.