Reversibility and linearity of sorption for some cations onto a Bulguksa granite

Park, Chung-Kyun; Hahn, Pil-Soo

doi:10.1007/bf02698348

Cited by 10 publications

(6 citation statements)

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“…Thus, the reversibility of sorption seems to be one of the key factors controlling surface diffusion. It is well reported that Sr sorbs reversibly onto a granite surface by ion exchange and desorbs easily [18]. The measured K d values and reversibility of a sorption onto the granite are arranged in Table 2.…”

Section: Resultsmentioning

confidence: 97%

“…On the other hand, about 70% of the Co and Cs was fixed strongly onto the granite surface. It is known that Cs and Co sorb preferentially on mica or ferro-manganese oxides of rock surface [18]. Such sorption is a very strong reaction and the sorbed nuclides are hard to move on the sorbed phase.…”

Section: Resultsmentioning

confidence: 99%

“…A typical example of a uranium speciation as a function of the pH[18]. Sorption profiles of uranium as functions of the pH and carbonates.…”

mentioning

confidence: 99%

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Diffusion of some chemical species through a granite considering their geochemical properties

Park

Baik

2009

Korean J. Chem. Eng.

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Through-diffusion experiments for some chemical species onto granite have been carried out to understand their diffusion characteristics according to their geochemical properties. The chemical species used in the experiment were classified into three groups as a nonsorbing tracer, simple cation and multivalent species. The difference in the diffusion process among the nonsorbing tracers was evaluated and discussed in terms of their interactions with the rock's pore surface. The extent of surface diffusion was examined from the view of sorption reversibility for the sorbing cations. For the multivalent species, two kinds of experiments were performed to study the effects of geochemical conditions in acidic and alkaline solutions. Chemical species and sorption properties were also investigated as a function of the pH and carbonates in order to examine the effects of the carbonates on diffusion in alkaline conditions.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

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Diffusion of some chemical species through a granite considering their geochemical properties

Park

Baik

2009

Korean J. Chem. Eng.

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“…Sensitivity testing suggested that the absolute value of the cation exchange parameters is not important. Gapon coefficients were chosen for the soil [ Robbins and Carter , ] and for the fractured rock [ Park and Hahn , ] (Table ). The CEC values of the soils were based on a local report [ Hall et al ., ], and varied according to clay contents.…”

Section: Methodsmentioning

confidence: 99%

Principal component analysis of watershed hydrochemical response to forest clearance and its usefulness for chloride mass balance applications

Guan

Hutson

Ding

et al. 2013

Water Resources Research

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[1] Application of the simple watershed chloride mass balance (CMB) method over areas of historical forest clearance is highly uncertain because the CMB method requires a steady state assumption, while the beginning, duration, and end of the transient period between preclearance and postclearance steady states is unknown. To address this difficulty, principal component analysis (PCA) with groundwater chemistry data is explored for the Piccadilly Valley in the Mount Lofty Ranges in South Australia, incorporated with hydrological modeling. The results indicate that PCA provides a potentially useful tool to identify postclearance dynamic hydrochemical response. Processes during the postclearance transient period, such as the release of historical soil chloride together with the chargebalance cations, alter ionic ratios from a steady state condition, which make the hydrochemical signals from the transient processes distinguishable from other processes by PCA. For the studied watershed, the effect of postclearance transient processes accounts for 24% of major-ion data variance, in comparison to 43% resulting from the effects of precipitation diluting and evapotranspiration concentrating processes. The PC scores associated with the transient processes are shown to be useful for estimating the timing of the postclearance transient, and estimating chloride concentration of groundwater recharge at the preclearance and postclearance steady states, even under conditions where the new steady state has not yet reached or the preclearance hydrochemical signal is lost.

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“…In most cases, isotherms of Langmuir and Freundlich are used to asses the effects of the concentration on sorption, e.g. Park and Hahn [12]. The Freundlich isotherm is…”

Section: Equations Of Solute Transport In Fracturesmentioning

confidence: 99%

Modelling groundwater flow and pollutant transport in hard-rock fractures

Mls¹

2007

WIT Transactions on Engineering Sciences, Vol 56

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There are several reasons for the fact that fracture flow has been a subject of active research for the last three decades. Rock fractures commonly exist in the Earth's upper crust and, therefore, significantly control groundwater movement. Fracture-dominated flow has become increasingly important in various problems of geotechnical interest. A particularly important reason for investigating fracture flow and contaminant transport is the necessity of building repositories of nuclearfuel waste which are often situated deep in granite massifs. The possibility of their damage during the long periods of storage requires the study of problems connected with the risk of possible contaminant displacement.The aim of this article is to model water flow and contaminant transport in hardrock fractures. Such results are required that make it possible to determine the hydraulic parameters of real fractures by comparison with data measurable under field conditions.Making use of the known hydromechanical characteristics of the modelled fracture and the aqueous phase, a problem with a set of three partial differential equations and related boundary conditions was formulated and numerically solved. The unknown functions of the problem are the liquid-phase pressure, the flow velocity and the contaminant concentration. The method of solution is described and the achieved results are visualized and presented.

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Reversibility and linearity of sorption for some cations onto a Bulguksa granite

Cited by 10 publications

References 11 publications

Diffusion of some chemical species through a granite considering their geochemical properties

Diffusion of some chemical species through a granite considering their geochemical properties

Principal component analysis of watershed hydrochemical response to forest clearance and its usefulness for chloride mass balance applications

Modelling groundwater flow and pollutant transport in hard-rock fractures

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