Isotopic characteristics of meteoric waters in the Belgrade region
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The stable isotope composition of hydrogen (delta H-2) and oxygen (delta O-18) in monthly precipitation and river water (Sava River and Danube) samples in the Belgrade area gathered between 1992 and 2005 are determined. The local meteoric water line delta H-2 = 7.8 (+/- 0.2) delta O-18 + 7.3(+/- 1.6) (r(2) = 0.98, 11 = 60, sigma = 0.52) for the whole period of observation is close to the global meteoric water line. The amount-weighted mean delta H-2 and delta O-18 values of precipitation were -65 +/- 27 parts per thousand and -9.4 +/- 3.4 parts per thousand, respectively. Good correlation between delta O-18 values (r greater than or similar to 0.67) and ambient temperature and relative humidity was obtained. Stream-water data ranged front -94 to -60 parts per thousand for delta H-2 and from -11.0 to -5.7 parts per thousand. for delta O-18 with highly statistically significant difference (p GT 0.01) between the Sava River and the Danube. In addition, the isotopic compositions of local p...recipitation and adjacent river water at monitoring sites were compared. Obtained data will give an opportunity to improve the knowledge of mixing stream water and local groundwater, and assessment of potential groundwater risks and pressures in the Belgrade basin.