Modelos incluían: mezcla, dilución por lluvia, nieve y agua subterránea,Įvapoconcentración, equilibrio con fases seleccionadas y reacciones de complejación Molinos de uranio (U) y aguas adicionales relacionadas con las minas. Se desarrollaron modelos geoquímicos utilizando PHREEQC para estimar laĬomposición de tres cuerpos de agua río abajo que reciben aguas de descarga de For 4 years, U acted as a conservative element with little attenuation, but later, U displayed some attenuation. The models were also evaluated for U using PhreePlot’s fitting capabilities. ![]() However, concentrations were not consistent with the published solubility constant for ferrihydrite, which was modified using a smaller HFO site density than is typically reported to better fit the observed As concentrations in Sink Lake, using PhreePlot to match the observed Fe concentrations. ![]() Hydrous ferric oxide (HFO) forms in the discharge zone, resulting in a drop in Fe concentrations. Conservative elements included Na, K, Cl, and Mg and attenuation was noted for some metals. Mixing and dilution played the dominant role in attenuation of the major ions. ![]() Starting with a water balance that quantified the flux of the discharged waters, the models used monthly sample compositions collected from the major discharge sources, as well as constant composition samples that represent ground and surface water sources. The models included: mixing dilution by rain, snow, and groundwater evapoconcentration equilibration with selected phases and surface complexation reactions. Geochemical models were developed using PHREEQC to estimate the composition of three downstream water bodies that accept uranium (U) mill discharge waters and additional mine-related waters.
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