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Interaction of (3)H(+) (as HTO) and (36)Cl(-) (as Na(36)Cl) with crushed granite and corresponding fracture infill material investigated in column experiments.

Štamberg K, Palágyi Š, Videnská K, Havlová V - J Radioanal Nucl Chem (2013)

Bottom Line: Furthermore, the research was focused to quantification of the effect of grain size on migration of studied radionuclides.The results showed that influence of grain size on sorption of (3)H(+) and (36)Cl(-) was negligible.On the other hand, the influence of grain size on Peclet numbers value and on dispersion coefficient was observed for both crystalline materials, namely in agreement with theoretical suppositions that the values of Peclet numbers decrease with increasing grain size and values of dispersion coefficient increase.

View Article: PubMed Central - PubMed

Affiliation: Department of Nuclear Chemistry, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University, 115 19 Prague, Czech Republic.

ABSTRACT

The transport of (3)H(+) (as HTO) and (36)Cl(-) (as Na(36)Cl) was investigated in the dynamic system, i.e., in the columns filled with crushed pure granite and fracture infill of various grain sizes. The aim of column experiments was to determine important transport parameter, such as the retardation, respectively distribution coefficients, Peclet numbers and hydrodynamic dispersion coefficients. Furthermore, the research was focused to quantification of the effect of grain size on migration of studied radionuclides. The experimental breakthrough curves were fitted by a model based on the erfc-function, assuming a linear reversible equilibrium sorption/desorption isotherm, and the above mentioned transport parameters were determined. The results showed that influence of grain size on sorption of (3)H(+) and (36)Cl(-) was negligible. Retardation and distribution coefficients of both tracers converged to one and zero, respectively, in case of all fractions of crushed granite and infill material. Generally, the presumed ion exclusion of (36)Cl in anionic form was proved under given conditions, only very weak one seems to exist in a case of infill material. In principal, both radionuclides behaved as non-sorbing, conservative tracers. On the other hand, the influence of grain size on Peclet numbers value and on dispersion coefficient was observed for both crystalline materials, namely in agreement with theoretical suppositions that the values of Peclet numbers decrease with increasing grain size and values of dispersion coefficient increase.

No MeSH data available.


Related in: MedlinePlus

Desorption breakthrough curves for 36Cl− (as Na36Cl) in crushed pure granite (open diamond) and in infill material (open square) of grain size 0.063–0.125 mm. Symbols: experimental data, lines: calculated values (solid line—to (open diamond), dash line—to (open square)) (Arel is the relative activity of 36Cl− (as Na36Cl) outgoing from the column and nPV is the number of pore volumes.)
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Fig4: Desorption breakthrough curves for 36Cl− (as Na36Cl) in crushed pure granite (open diamond) and in infill material (open square) of grain size 0.063–0.125 mm. Symbols: experimental data, lines: calculated values (solid line—to (open diamond), dash line—to (open square)) (Arel is the relative activity of 36Cl− (as Na36Cl) outgoing from the column and nPV is the number of pore volumes.)

Mentions: The experimental breakthrough curves (BTC) of 3H+ (as HTO) and 36Cl− (as Na36Cl) obtained both with crushed granite and their infill materials, as well as the results of the fitting of these data with theoretical BTC calculated by linear isotherm approach model, are demonstrated for grain size 0.063–0.125 mm in Figs. 1, 2 for sorption and desorption of 3H+, respectively, and in Figs. 3, 4 for sorption and desorption of 36Cl−, respectively. The breakthrough curves for other grain sizes are similar or practically the same. This similarity is evident from (Tables 2, 4, 5 and 6), where the important transport parameters are summarized, including the values of goodness-of-fit criterion declaring the very good agreement between experimental and calculated data. Unfortunately, a few of column experiments with HTO, see PDM1-1a (Fig. 2) and PDM1-2c sorption, and with 36Cl−, see PDM1-1d and PDM1-2d, evidently are loaded with experimental error probably as a result of short columns and of the problems connected with the starting point (nPV = 0) determination.Fig. 1


Interaction of (3)H(+) (as HTO) and (36)Cl(-) (as Na(36)Cl) with crushed granite and corresponding fracture infill material investigated in column experiments.

Štamberg K, Palágyi Š, Videnská K, Havlová V - J Radioanal Nucl Chem (2013)

Desorption breakthrough curves for 36Cl− (as Na36Cl) in crushed pure granite (open diamond) and in infill material (open square) of grain size 0.063–0.125 mm. Symbols: experimental data, lines: calculated values (solid line—to (open diamond), dash line—to (open square)) (Arel is the relative activity of 36Cl− (as Na36Cl) outgoing from the column and nPV is the number of pore volumes.)
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC4514635&req=5

Fig4: Desorption breakthrough curves for 36Cl− (as Na36Cl) in crushed pure granite (open diamond) and in infill material (open square) of grain size 0.063–0.125 mm. Symbols: experimental data, lines: calculated values (solid line—to (open diamond), dash line—to (open square)) (Arel is the relative activity of 36Cl− (as Na36Cl) outgoing from the column and nPV is the number of pore volumes.)
Mentions: The experimental breakthrough curves (BTC) of 3H+ (as HTO) and 36Cl− (as Na36Cl) obtained both with crushed granite and their infill materials, as well as the results of the fitting of these data with theoretical BTC calculated by linear isotherm approach model, are demonstrated for grain size 0.063–0.125 mm in Figs. 1, 2 for sorption and desorption of 3H+, respectively, and in Figs. 3, 4 for sorption and desorption of 36Cl−, respectively. The breakthrough curves for other grain sizes are similar or practically the same. This similarity is evident from (Tables 2, 4, 5 and 6), where the important transport parameters are summarized, including the values of goodness-of-fit criterion declaring the very good agreement between experimental and calculated data. Unfortunately, a few of column experiments with HTO, see PDM1-1a (Fig. 2) and PDM1-2c sorption, and with 36Cl−, see PDM1-1d and PDM1-2d, evidently are loaded with experimental error probably as a result of short columns and of the problems connected with the starting point (nPV = 0) determination.Fig. 1

Bottom Line: Furthermore, the research was focused to quantification of the effect of grain size on migration of studied radionuclides.The results showed that influence of grain size on sorption of (3)H(+) and (36)Cl(-) was negligible.On the other hand, the influence of grain size on Peclet numbers value and on dispersion coefficient was observed for both crystalline materials, namely in agreement with theoretical suppositions that the values of Peclet numbers decrease with increasing grain size and values of dispersion coefficient increase.

View Article: PubMed Central - PubMed

Affiliation: Department of Nuclear Chemistry, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University, 115 19 Prague, Czech Republic.

ABSTRACT

The transport of (3)H(+) (as HTO) and (36)Cl(-) (as Na(36)Cl) was investigated in the dynamic system, i.e., in the columns filled with crushed pure granite and fracture infill of various grain sizes. The aim of column experiments was to determine important transport parameter, such as the retardation, respectively distribution coefficients, Peclet numbers and hydrodynamic dispersion coefficients. Furthermore, the research was focused to quantification of the effect of grain size on migration of studied radionuclides. The experimental breakthrough curves were fitted by a model based on the erfc-function, assuming a linear reversible equilibrium sorption/desorption isotherm, and the above mentioned transport parameters were determined. The results showed that influence of grain size on sorption of (3)H(+) and (36)Cl(-) was negligible. Retardation and distribution coefficients of both tracers converged to one and zero, respectively, in case of all fractions of crushed granite and infill material. Generally, the presumed ion exclusion of (36)Cl in anionic form was proved under given conditions, only very weak one seems to exist in a case of infill material. In principal, both radionuclides behaved as non-sorbing, conservative tracers. On the other hand, the influence of grain size on Peclet numbers value and on dispersion coefficient was observed for both crystalline materials, namely in agreement with theoretical suppositions that the values of Peclet numbers decrease with increasing grain size and values of dispersion coefficient increase.

No MeSH data available.


Related in: MedlinePlus