Diffusion and Sorption Studies of Cs, Sr and Co in Intact Crystalline Rock
نویسندگان
چکیده
Three cationic tracers, Sr2+, Co2+ and Cs+ were tested with a modified electromigration device by applying 2V, 3V 4V voltage gradients over an intact Grimsel granodiorite rock sample. An ideal plug-flow model advection-dispersion applied to analyze the breakthrough curves. Matrix characterization C-14-PMMA autoradiography scanning electron microscopy showed that in centimeter scale of rock, interconnected matrix porosity forms well-connected network for diffusion. Micrometer-scale fissures are transecting biotite chlorite minerals, indicating sorption studied cations. The indicated effective diffusion coefficients (De values) tracer ions within 3.20 × 10−13 m2/s, 1.23 m2/s 2.25 10−12 respectively. De values also derived from model, which 2.86 1.35 2.26 calculated. speed tracers was sequence > Sr2+ is same as their diluted water. distribution (Kd calculated models covered range two magnitudes (from 10−7 m3/kg 10−5 m3/kg). result process elements did not reach equilibrium during process, mainly due too much acceleration migration
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ژورنال
عنوان ژورنال: Minerals
سال: 2022
ISSN: ['2075-163X']
DOI: https://doi.org/10.3390/min12020231