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A model of uranium uptake by plant roots allowing for root-induced changes in the soil

A model of uranium uptake by plant roots allowing for root-induced changes in the soil
A model of uranium uptake by plant roots allowing for root-induced changes in the soil
We develop a model with which to study the poorly-understood mechanisms of uranium (U) uptake by plants. The model is based on equations for transport and reaction of U and acids and bases in the rhizosphere around cylindrical plant roots. It allows for the speciation of U with hydroxyl, carbonate and organic ligands in the soil solution; the nature and kinetics of sorption reactions with the soil solid; and the effects of root-induced changes in rhizosphere pH. A sensitivity analysis showed the importance of soil sorption and speciation parameters as influenced by pH and CO2 pressure; and of root geometry and root-induced acid-base changes linked to the form of nitrogen taken up by the root. The root absorbing coefficient for U, relating influx to the concentration of U species in solution at the root surface, was also important. Simplified empirical models of U uptake by different plant species and soil types need to account for these effects.
0013-936X
3536–3545
Boghi, Andrea
54a72da6-c8a2-468c-9773-897efac0638f
Roose, Tiina
3581ab5b-71e1-4897-8d88-59f13f3bccfe
Kirk, Guy J.D.
8091b42a-d2f4-4a03-b0a6-969034a74ffa
Boghi, Andrea
54a72da6-c8a2-468c-9773-897efac0638f
Roose, Tiina
3581ab5b-71e1-4897-8d88-59f13f3bccfe
Kirk, Guy J.D.
8091b42a-d2f4-4a03-b0a6-969034a74ffa

Boghi, Andrea, Roose, Tiina and Kirk, Guy J.D. (2018) A model of uranium uptake by plant roots allowing for root-induced changes in the soil. Environmental Science & Technology, 52 (6), 3536–3545. (doi:10.1021/acs.est.7b06136).

Record type: Article

Abstract

We develop a model with which to study the poorly-understood mechanisms of uranium (U) uptake by plants. The model is based on equations for transport and reaction of U and acids and bases in the rhizosphere around cylindrical plant roots. It allows for the speciation of U with hydroxyl, carbonate and organic ligands in the soil solution; the nature and kinetics of sorption reactions with the soil solid; and the effects of root-induced changes in rhizosphere pH. A sensitivity analysis showed the importance of soil sorption and speciation parameters as influenced by pH and CO2 pressure; and of root geometry and root-induced acid-base changes linked to the form of nitrogen taken up by the root. The root absorbing coefficient for U, relating influx to the concentration of U species in solution at the root surface, was also important. Simplified empirical models of U uptake by different plant species and soil types need to account for these effects.

Text Boghi et al ES&T final - Accepted Manuscript
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Accepted/In Press date: 21 February 2018
e-pub ahead of print date: 21 February 2018

Identifiers

Local EPrints ID: 418326
URI: https://eprints.soton.ac.uk/id/eprint/418326
ISSN: 0013-936X
PURE UUID: 2fa0e994-8da5-48c0-b35d-9d0834f84fb5
ORCID for Andrea Boghi: ORCID iD orcid.org/0000-0002-9387-326X
ORCID for Tiina Roose: ORCID iD orcid.org/0000-0001-8710-1063

Catalogue record

Date deposited: 28 Feb 2018 17:30
Last modified: 28 Jun 2018 00:39

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Contributors

Author: Andrea Boghi ORCID iD
Author: Tiina Roose ORCID iD
Author: Guy J.D. Kirk

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