Hydroponics as a valid tool to assess arsenic availability in mine soils
Entity
UAM. Departamento de Química AgrícolaPublisher
ElsevierDate
2010-04-01Citation
10.1016/j.chemosphere.2010.02.034
Chemosphere 79.5 (2010): 513-517
ISSN
0045-6535 (print); 1879-1298 (online)DOI
10.1016/j.chemosphere.2010.02.034Funded by
This study was supported by the Spanish Ministry of Education and Science, project CTM 2007-66401-CO2/TECNO, and by Comunidad de Madrid, project S-0505/AMB/0296Project
Comunidad de Madrid. S2009/AMB-1478/EIADESEditor's Version
http://dx.doi.org/10.1016/j.chemosphere.2010.02.034Subjects
Arsenate; Dose-response; Lupin plants; Phytoremediation; Polluted soils; QuímicaRights
© 2010 Elsevier Ltd. All rights reservedEsta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
Abstract
The low solubility of As in mine soils limits its phytoavailability. This makes the extrapolation of data obtained under hydroponic conditions unrealistic because the concentration in nutrient solution frequently overexposes plants to this metalloid. This work evaluates whether As supply in hydroponics resembles, to some extent, the As phytoavailable fraction in soils and the implications for phytoremediation. Phytotoxicity of As, in terms of biomass production, chlorophyll levels, and As concentrations in plants, was estimated and compared in both soils and hydroponics. In order for hydroponic conditions to be compared to soil conditions, plant exposure levels were measured in both cultures. Hydroponic As concentration ranging from 2-8 μM equated to the same plant organ concentrations from soils with 700-3000 mg kg-1. Total and extractable As fractions exceeded those values, but As concentrations in pore water were bellow them. According to our results (i) hydroponics should include doses in the range 0-10 μM As to allow the extrapolation of the results to As-polluted soils, and (ii) phytoextraction of As in mining sites will be limited by low As phytoavailability
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Google Scholar:Moreno-Jiménez, E.
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Esteban Fernández, Elvira
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Fresno, T.
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López de Egea, C.
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Peñalosa Olivares, Jesús Manuel
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