Modeling Coupled Hydrologic and Chemical Processes: Long-Term Uranium Transport following Phosphorus Fertilization

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Modeling Coupled Hydrologic and Chemical Processes: Long-Term Uranium Transport following Phosphorus Fertilization. / Jacques, Diederik; Simunek, Jirka; Mallants, Dirk; van Genuchten, M.Th.

In: Vadose Zone Journal, Vol. 7, No. 2, 01.05.2008, p. 698-711.

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Jacques, Diederik ; Simunek, Jirka ; Mallants, Dirk ; van Genuchten, M.Th. / Modeling Coupled Hydrologic and Chemical Processes: Long-Term Uranium Transport following Phosphorus Fertilization. In: Vadose Zone Journal. 2008 ; Vol. 7, No. 2. pp. 698-711.

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@article{f48adf2e9d3c40188738c74d5ec8fe76,
title = "Modeling Coupled Hydrologic and Chemical Processes: Long-Term Uranium Transport following Phosphorus Fertilization",
abstract = "A hypothetical application is presented of the HP1 multicomponent transport simulator to predict the transport of two major elements (Ca and P) and one trace element (U) applied annually for 200 yr to a field soil in the form of an inorganic P fertilizer. Interactions of Ca, P, and U with the solid phase are described using cation exchange and surface complexation reactions. Simulations assuming steady-state or transient flow conditions were analyzed in terms of temporal variations of the linear distribution coefficient, Kd, which depends strongly on pH and the composition of the aqueous phase. If the composition of the aqueous phase is constant, adsorption of Ca and U increases with increasing pH. Due to the annual addition of Ca, P, and U, and competition between P and U for sorption sites, the Kd of these elements decreased with time near the soil surface. Deeper in the soil, the Kd of U followed the pH increase because of a lack of competition from P. Because of the combined effects of changing hydrologic and geochemical conditions, the Ca and U distribution coefficients and solute fluxes during the transient simulation exhibited large short-time variations of up to three orders of magnitude",
keywords = "reactive transport modelling, HP1, vadoze zone, U-leaching, P-fertilization",
author = "Diederik Jacques and Jirka Simunek and Dirk Mallants and {van Genuchten}, M.Th.",
note = "Score = 10",
year = "2008",
month = may,
day = "1",
doi = "10.2136/vzj2007.0084",
language = "English",
volume = "7",
pages = "698--711",
journal = "Vadose Zone Journal",
issn = "1539-1663",
publisher = "SSSA - Soil Science Society of America",
number = "2",

}

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TY - JOUR

T1 - Modeling Coupled Hydrologic and Chemical Processes: Long-Term Uranium Transport following Phosphorus Fertilization

AU - Jacques, Diederik

AU - Simunek, Jirka

AU - Mallants, Dirk

AU - van Genuchten, M.Th.

N1 - Score = 10

PY - 2008/5/1

Y1 - 2008/5/1

N2 - A hypothetical application is presented of the HP1 multicomponent transport simulator to predict the transport of two major elements (Ca and P) and one trace element (U) applied annually for 200 yr to a field soil in the form of an inorganic P fertilizer. Interactions of Ca, P, and U with the solid phase are described using cation exchange and surface complexation reactions. Simulations assuming steady-state or transient flow conditions were analyzed in terms of temporal variations of the linear distribution coefficient, Kd, which depends strongly on pH and the composition of the aqueous phase. If the composition of the aqueous phase is constant, adsorption of Ca and U increases with increasing pH. Due to the annual addition of Ca, P, and U, and competition between P and U for sorption sites, the Kd of these elements decreased with time near the soil surface. Deeper in the soil, the Kd of U followed the pH increase because of a lack of competition from P. Because of the combined effects of changing hydrologic and geochemical conditions, the Ca and U distribution coefficients and solute fluxes during the transient simulation exhibited large short-time variations of up to three orders of magnitude

AB - A hypothetical application is presented of the HP1 multicomponent transport simulator to predict the transport of two major elements (Ca and P) and one trace element (U) applied annually for 200 yr to a field soil in the form of an inorganic P fertilizer. Interactions of Ca, P, and U with the solid phase are described using cation exchange and surface complexation reactions. Simulations assuming steady-state or transient flow conditions were analyzed in terms of temporal variations of the linear distribution coefficient, Kd, which depends strongly on pH and the composition of the aqueous phase. If the composition of the aqueous phase is constant, adsorption of Ca and U increases with increasing pH. Due to the annual addition of Ca, P, and U, and competition between P and U for sorption sites, the Kd of these elements decreased with time near the soil surface. Deeper in the soil, the Kd of U followed the pH increase because of a lack of competition from P. Because of the combined effects of changing hydrologic and geochemical conditions, the Ca and U distribution coefficients and solute fluxes during the transient simulation exhibited large short-time variations of up to three orders of magnitude

KW - reactive transport modelling

KW - HP1

KW - vadoze zone

KW - U-leaching

KW - P-fertilization

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_88502

UR - http://knowledgecentre.sckcen.be/so2/bibref/4963

U2 - 10.2136/vzj2007.0084

DO - 10.2136/vzj2007.0084

M3 - Article

VL - 7

SP - 698

EP - 711

JO - Vadose Zone Journal

JF - Vadose Zone Journal

SN - 1539-1663

IS - 2

ER -

ID: 341706