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000000462 084__ $$2WoS$$aEnvironmental Sciences
000000462 084__ $$2WoS$$aGeosciences, Multidisciplinary
000000462 084__ $$2WoS$$aWater Resources
000000462 1001_ $$0P:(DE-Juel1)129549$$aVereecken, H.$$b0$$uFZJ
000000462 245__ $$aAnalysis of the long-term behavior of solute transport with nonlinear equilibrium sorption using breakthrough curves and temporal moments
000000462 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2002
000000462 300__ $$a
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000000462 440_0 $$03225$$aJournal of Contaminant Hydrology$$v56$$x0169-7722$$y3
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000000462 520__ $$aWe analyzed the long-term behavior of breakthrough curves (BTCs) and temporal moments of a solute subjected to Freundlich equilibrium sorption (s=kc(n)). For one-dimensional transport in a homogeneous porous medium, we derived a power-law relation between travel time, tau, and solute displacement,., with the exponent being equal to the Freundlich n exponent. The mean solute velocity, derived from the first time moment, was found to change as tau(n-1). For n values larger than 0.66, the second time moment could be related to c (x) over bar (2/n), where c is a constant. An approach based on the use of a critical concentration was developed to estimate the presence of the asymptotic regime in the tail of the BTC. This approach was tested successfully using numerical case studies. One-dimensional numerical simulations with varying values of k, n and initial mass were run to verify the closed form analytical expressions for the large time behavior of temporal moments and the tailing pail of breakthrough Curves. Good agreement between the slope of the tailing part of log-log transformed BTCs and the predicted slope using asymptotic theory was found. Asymptotic theory in general underestimated the magnitude of the concentration in the tail. The quality of the estimated concentrations in the tail improved for small values of the dispersivity. Experimental BTCs of uranin and benazolin were analyzed in combination with sorption/desorption batch experiments using asymptotic theory. A good agreement between the value of n parameter derived from desorption experiment with benazolin and the value of the n parameter derived from the tail of the BTC was found. (C) 2002 Elsevier Science B.V. All rights reserved.
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000000462 65320 $$2Author$$asolute transport
000000462 65320 $$2Author$$abreakthrough curves
000000462 65320 $$2Author$$atemporal moments
000000462 7001_ $$0P:(DE-HGF)0$$aJaekel, U.$$b1
000000462 7001_ $$0P:(DE-HGF)0$$aSchwarze, H.$$b2
000000462 773__ $$0PERI:(DE-600)1494766-3$$a10.1016/S0169-7722(01)00200-5$$gVol. 56$$q56$$tJournal of contaminant hydrology$$v56$$x0169-7722$$y2002
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000000462 9141_ $$y2002
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