The paper described the tritium distribution in spring waters in Slovenia. Water samples were collected from 124 springs Tritium was enriched electrolytically and its concentration determined by liquid scintillation analysis. Tritium concentrations ranged from 325 to ca. 3000 Bq m–3, with a geometric mean of 1223 Bq m–3 and geometric standard deviation of 1.6. The present database of tritium concentrations constitutes a first step in estimating general spatial trends and obtain enough information to interpret tritium levels from the geological and hydrological point of view.
The relative contributions of dolomite to calcite weathering related to riverine fluxes are investigated on a highly resolved spatial scale in the diverse watersheds of Slovenia, which previous work has shown have some of the highest carbonate-weathering intensities in the world and suggests that dolomite weathering is favored over limestone weathering in mixed carbonate watersheds. Carbonate-weathering intensity (mmol/km2-s) is highest within the alpine regions where stream discharge values range widely to extreme values during spring snowmelt. Overall, the elemental fluxes of HCO3-, Ca2+, and Mg2+ from the tributary watersheds are proportional to the total water flux because carbonates dissolve rapidly to near equilibrium. Importantly, dolomite weathers preferentially over calcite except for pure limestone catchments.
A method for merasuring low activity concentration of uranium in water samples is described. After evaporating 50 L of water, about 30 g of dry resudue remains, which is measured twice on a gamma-ray spectormeter to determine the concentrations of uranium and 234Th, which is the decay product of 238U. The critical level for such a measurements is 1.5 Bq/m3 for 238U and 4.3 Bq/m3 for 234Th.