Arsenic phytoextraction by Pteris vittata L. and frond conversion by solvolysis

Mench, Michel; Galende, Maria; Marchand, Lilian; Kechit, F; Carrier, Marion; Loppinet-Serani, Anne; Caille, N.; Zhao, F-J.; Vangronsveld, Jaco

doi:10.1201/b16767-306

Cited by 2 publications

(1 citation statement)

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“…The soil is sandy, contained about 5% clay, was classified as a Podzol and had been contaminated with up to 600 mg As kg -1 . The topsoil (0-14 cm) was stabilized with ZVI amendments, placed in large outdoor lysimeters in 1997 in plots that were cultivated, first with maize and vegetables and later with an arsenic hyperaccumulator (Pteris vittata L.) (Mench et al, 2014). Samples of untreated soil (AsUNT) and of soil stabilized with 1 wt-% ZVI (AsZVI) were collected from the lysimeters in March 2012.…”

Section: Soil Sampling and Characterizationmentioning

confidence: 99%

Immobilization of Cu and As in two contaminated soils with zero-valent iron – Long-term performance and mechanisms

Tiberg

Kumpienė

Gustafsson

et al. 2016

Applied Geochemistry

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Immobilization of trace elements in contaminated soils by zero-valent iron (ZVI) is a promising remediation method, but questions about its long-term performance remain unanswered. To quantify immobilization and predict possible contaminant remobilization on long timescales detailed knowledge about immobilization mechanisms is needed. This study aimed at assessing the long-term effect of ZVI amendments on dissolved copper and arsenic in contaminated soils, at exploring the immobilization mechanism(s), and at setting up a geochemical model able to estimate dissolved copper and arsenic under different scenarios.Samples from untreated and ZVI-treated plots in two field experiments where ZVI had been added 6 and 15 years ago were investigated by a combination of batch experiments, geochemical modeling and extended X-ray absorption fine structure (EXAFS) spectroscopy.Dissolved copper and arsenic concentrations were described by a multisurface geochemical model with surface complexation reactions, verified by EXAFS. The ZVI remained "reactive" after 6-15 years, i.e. the dissolved concentrations of copper and arsenic were lower in the ZVI-treated than in the untreated soils. There was a shift in copper speciation from organic matter complexes in the untreated soil to surface complexes with iron (hydr)oxides in the ZVI-treated soil. The pH value was important for copper immobilization and ZVI did not have a stabilizing effect if pH was lower than about 6. Immobilization of arsenic was slightly pH-dependent and sensitive to the competition with phosphate. If phosphate was ignored in the modeling, the dissolution of arsenate was greatly underestimated.

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Section: Soil Sampling and Characterizationmentioning

confidence: 99%

Immobilization of Cu and As in two contaminated soils with zero-valent iron – Long-term performance and mechanisms

Tiberg

Kumpienė

Gustafsson

et al. 2016

Applied Geochemistry

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Water and soil contaminated by arsenic: the use of microorganisms and plants in bioremediation

Bertin

Crognale

Plewniak

et al. 2021

Environ Sci Pollut Res

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Owing to their roles in the arsenic (As) biogeochemical cycle, microorganisms and plants offer significant potential for developing innovative biotechnological applications able to remediate As pollutions. This possible use in bioremediation processes and phytomanagement is based on their ability to catalyse various biotransformation reactions leading to, e.g. the precipitation, dissolution, and sequestration of As, stabilisation in the root zone and shoot As removal. On the one hand, genomic studies of microorganisms and their communities are useful in understanding their metabolic activities and their interaction with As. On the other hand, our knowledge of molecular mechanisms and fate of As in plants has been improved by laboratory and field experiments. Such studies pave new avenues for developing environmentally friendly bioprocessing options targeting As, which worldwide represents a major risk to many ecosystems and human health.

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Arsenic phytoextraction by Pteris vittata L. and frond conversion by solvolysis

Cited by 2 publications

References 1 publication

Immobilization of Cu and As in two contaminated soils with zero-valent iron – Long-term performance and mechanisms

Immobilization of Cu and As in two contaminated soils with zero-valent iron – Long-term performance and mechanisms

Water and soil contaminated by arsenic: the use of microorganisms and plants in bioremediation

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