6 research outputs found
Deliquescence of NaClâNaNO(3), KNO(3)âNaNO(3), and NaClâKNO(3 )salt mixtures from 90 to 120°C
We conducted reversed deliquescence experiments in saturated NaClâNaNO(3)âH(2)O, KNO(3)âNaNO(3)âH(2)O, and NaClâKNO(3)âH(2)O systems from 90 to 120°C as a function of relative humidity and solution composition. NaCl, NaNO(3), and KNO(3 )represent members of dust salt assemblages that are likely to deliquesce and form concentrated brines on high-level radioactive waste package surfaces in a repository environment at Yucca Mountain, NV. Discrepancy between model prediction and experiment can be as high as 8% for relative humidity and 50% for dissolved ion concentration. The discrepancy is attributed primarily to the use of 25°C models for ClâNO(3 )and KâNO(3 )ion interactions in the current Yucca Mountain Project high-temperature Pitzer model to describe the nonideal behavior of these highly concentrated solutions
Effect of reducing groundwater on the retardation of redox-sensitive radionuclides
Laboratory batch sorption experiments were used to investigate variations in the retardation behavior of redox-sensitive radionuclides. Water-rock compositions were designed to simulate subsurface conditions at the Nevada Test Site (NTS), where a suite of radionuclides were deposited as a result of underground nuclear testing. Experimental redox conditions were controlled by varying the oxygen content inside an enclosed glove box and by adding reductants into the testing solutions