PoplarV1, Main, Exploration, bibRecord, 004228

Modeling of TCE diffusion to the atmosphere and distribution in plant stems.

Identifieur interne : 004228 ( Main/Exploration ); précédent : 004227; suivant : 004229

Modeling of TCE diffusion to the atmosphere and distribution in plant stems.

Auteurs : Xingmao Ma [États-Unis] ; Joel Burken

Source :

Environmental science & technology [ 0013-936X ] ; 2004.

RBID : pubmed:15461166

Descripteurs français

KwdFr :
- Atmosphère (MeSH), Diffusion (MeSH), Distribution tissulaire (MeSH), Gestion des déchets (méthodes), Modèles biologiques (MeSH), Polluants du sol (analyse), Polluants du sol (métabolisme), Populus (composition chimique), Populus (métabolisme), Solvants (analyse), Solvants (métabolisme), Tiges de plante (composition chimique), Tiges de plante (métabolisme), Transpiration des plantes (MeSH), Transport biologique (MeSH), Trichloroéthylène (analyse), Trichloroéthylène (métabolisme), Volatilisation (MeSH).
MESH :
- analyse : Polluants du sol, Solvants, Trichloroéthylène.
- composition chimique : Populus, Tiges de plante.
- métabolisme : Polluants du sol, Populus, Solvants, Tiges de plante, Trichloroéthylène.
- méthodes : Gestion des déchets.
- Atmosphère, Diffusion, Distribution tissulaire, Modèles biologiques, Transpiration des plantes, Transport biologique, Volatilisation.

English descriptors

KwdEn :
- Atmosphere (MeSH), Biological Transport (MeSH), Diffusion (MeSH), Models, Biological (MeSH), Plant Stems (chemistry), Plant Stems (metabolism), Plant Transpiration (MeSH), Populus (chemistry), Populus (metabolism), Soil Pollutants (analysis), Soil Pollutants (metabolism), Solvents (analysis), Solvents (metabolism), Tissue Distribution (MeSH), Trichloroethylene (analysis), Trichloroethylene (metabolism), Volatilization (MeSH), Waste Management (methods).
MESH :
- chemical , analysis : Soil Pollutants, Solvents, Trichloroethylene.
- chemistry : Plant Stems, Populus.
- metabolism : Plant Stems, Populus, Soil Pollutants, Solvents, Trichloroethylene.
- methods : Waste Management.
- Atmosphere, Biological Transport, Diffusion, Models, Biological, Plant Transpiration, Tissue Distribution, Volatilization.

Abstract

Fate of chlorinated solvents in phytoremediation has been delineated by many discoveries made in recent years. Plant uptake, metabolism, rhizosphere degradation, accumulation, and volatilization were shown to occur to differing degrees for many organic contaminants including chlorinated solvents. Among these mechanistic findings, recent research confirmed that volatile organic compounds (VOCs) volatilize from stems and that the resulting diffusive flux to the atmosphere is related to exposure concentration and to height up the stem. A comprehensive model was developed based upon all identified fate and transport mechanisms for VOCs, including translocation in the xylem flow and diffusion. The dispersion and diffusion in the radial direction were considered as one process (effective diffusion) as the two could not be investigated individually. The mechanism-based model mathematically indicates an exponential decrease of concentrations with height. While an analytic solution for the comprehensive model was not attained, it can serve as a starting point for other modeling efforts. The comprehensive model was simplified in this work for practical application to experimentally obtained data on trichloroethylene (TCE) fate. Model output correlated well with experimental results, and effective diffusivities for TCE in plant tissues were obtained through the model calibrations. The simplified model approximated TCE concentrations in the transpiration stream as well as TCE volatilization to the atmosphere. Xylem transport, including advection, dispersion, and diffusion through cell walls with subsequent volatilization to the atmosphere, is a major fate for VOCs in phytoremediation.

DOI: 10.1021/es035435b
PubMed: 15461166

Affiliations:

États-Unis

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Le document en format XML

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<term>Diffusion (MeSH)</term>
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<term>Plant Stems (metabolism)</term>
<term>Plant Transpiration (MeSH)</term>
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<term>Modèles biologiques (MeSH)</term>
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<term>Polluants du sol (métabolisme)</term>
<term>Populus (composition chimique)</term>
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<term>Tiges de plante (composition chimique)</term>
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<term>Transport biologique (MeSH)</term>
<term>Trichloroéthylène (analyse)</term>
<term>Trichloroéthylène (métabolisme)</term>
<term>Volatilisation (MeSH)</term>
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<term>Diffusion</term>
<term>Distribution tissulaire</term>
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<front><div type="abstract" xml:lang="en">Fate of chlorinated solvents in phytoremediation has been delineated by many discoveries made in recent years. Plant uptake, metabolism, rhizosphere degradation, accumulation, and volatilization were shown to occur to differing degrees for many organic contaminants including chlorinated solvents. Among these mechanistic findings, recent research confirmed that volatile organic compounds (VOCs) volatilize from stems and that the resulting diffusive flux to the atmosphere is related to exposure concentration and to height up the stem. A comprehensive model was developed based upon all identified fate and transport mechanisms for VOCs, including translocation in the xylem flow and diffusion. The dispersion and diffusion in the radial direction were considered as one process (effective diffusion) as the two could not be investigated individually. The mechanism-based model mathematically indicates an exponential decrease of concentrations with height. While an analytic solution for the comprehensive model was not attained, it can serve as a starting point for other modeling efforts. The comprehensive model was simplified in this work for practical application to experimentally obtained data on trichloroethylene (TCE) fate. Model output correlated well with experimental results, and effective diffusivities for TCE in plant tissues were obtained through the model calibrations. The simplified model approximated TCE concentrations in the transpiration stream as well as TCE volatilization to the atmosphere. Xylem transport, including advection, dispersion, and diffusion through cell walls with subsequent volatilization to the atmosphere, is a major fate for VOCs in phytoremediation.</div>
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<Abstract><AbstractText>Fate of chlorinated solvents in phytoremediation has been delineated by many discoveries made in recent years. Plant uptake, metabolism, rhizosphere degradation, accumulation, and volatilization were shown to occur to differing degrees for many organic contaminants including chlorinated solvents. Among these mechanistic findings, recent research confirmed that volatile organic compounds (VOCs) volatilize from stems and that the resulting diffusive flux to the atmosphere is related to exposure concentration and to height up the stem. A comprehensive model was developed based upon all identified fate and transport mechanisms for VOCs, including translocation in the xylem flow and diffusion. The dispersion and diffusion in the radial direction were considered as one process (effective diffusion) as the two could not be investigated individually. The mechanism-based model mathematically indicates an exponential decrease of concentrations with height. While an analytic solution for the comprehensive model was not attained, it can serve as a starting point for other modeling efforts. The comprehensive model was simplified in this work for practical application to experimentally obtained data on trichloroethylene (TCE) fate. Model output correlated well with experimental results, and effective diffusivities for TCE in plant tissues were obtained through the model calibrations. The simplified model approximated TCE concentrations in the transpiration stream as well as TCE volatilization to the atmosphere. Xylem transport, including advection, dispersion, and diffusion through cell walls with subsequent volatilization to the atmosphere, is a major fate for VOCs in phytoremediation.</AbstractText>
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Modeling of TCE diffusion to the atmosphere and distribution in plant stems.

Modeling of TCE diffusion to the atmosphere and distribution in plant stems.

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

Pour générer des pages wiki