Temporal evolution of redox processes and free Cd dynamics in a metal-contaminated soil after rewetting

Cornu, Jean Yves; Denaix, Laurence; Schneider, A.; Pellerin, Sylvain

doi:10.1016/j.chemosphere.2007.06.003

Cited by 52 publications

(35 citation statements)

References 18 publications

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“…The establishment of local anaerobic conditions in soil was highly suspected from the results reported by Cornu et al (2007a) in similar growth conditions. Using the close relationship reported by Cornu et al (2007a) between the soil redox potential and the dynamics of the oxidized species (i.e.…”

Section: Establishment Of Anaerobic Conditionsmentioning

confidence: 86%

“…However, little is known about the implication of these physicochemical parameters in the dynamics of metals at the time scale of plant growth. A previous study reporting the temporal dynamics of Cd in an uncropped soil (Cornu et al 2007a) showed significant variations in the concentration of Cd 2+ in soil solution over a 21-day period. The temporal variability of solution Cd 2+ concentration was related predominantly to the solution ionic strength via its impact on the sorption of Cd to the solid phase.…”

Section: Introductionmentioning

confidence: 96%

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Temporal variability of solution Cd2+ concentration in metal-contaminated soils as affected by soil temperature: consequences on lettuce (Lactuca sativa L.) exposure

Cornu

Denaix²,

Schneider³

et al. 2008

Plant Soil

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The aim of this study was to assess how the solubility and the speciation of Cd in soil solution were affected over time by the soil temperature for three metal-contaminated soils. The changes of solution Cd concentration (either total or free ionic) and other physico-chemical parameters (e.g. pH, ionic strength, the concentrations of NO À 3 , SO 2À 4 , Ca, Mg and dissolved organic carbon) were monitored over a 28-day culture of lettuce (Lactuca sativa L.) in soils incubated at 10°C, 20°C or 30°C. The major result of this study was that Cd 2+ concentration greatly varied over time in soil solution. The Cd 2+ concentration declined over time in soil solution as did the concentration of cations that may compete for adsorption (Ca 2+ , Mg 2+ ). The rise in soil temperature primarily impacted on the concentration of Cd 2+ via promoting the microbial C-degradation and, thus, the complexation of Cd in soil solution. The integration of the temporal variations in Cd 2+ concentration through the calculation of the root exposure to solution Cd (E Cd ) provided a fairly close and robust prediction of Cd concentration in lettuce roots. The present work thus provided new insights on the fate of Cd in contaminated soils that may be relevant for predicting the root uptake of Cd.

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Section: Establishment Of Anaerobic Conditionsmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 96%

Temporal variability of solution Cd2+ concentration in metal-contaminated soils as affected by soil temperature: consequences on lettuce (Lactuca sativa L.) exposure

Cornu

Denaix²,

Schneider³

et al. 2008

Plant Soil

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“…For the desorption rate constant of Cd 2+ (k des M ), we defined the range of variation from literature values (Chaturvedi et al 2006;Chen et al 2006;Cornu et al 2007;Ernstberger et al 2002;Tsang et al 2007): 10 −6 to 5.5×10 −4 s −1 . This range was also chosen for the desorption rate constant of the ligand and of the complex (k des L =k des ML ).…”

Section: Model Parameters Domain For Non-polluted Agricultural Soilsmentioning

confidence: 99%

Ranking of mechanisms governing the phytoavailability of cadmium in agricultural soils using a mechanistic model

et al. 2015

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Aims The objective of this study was to rank the mechanisms influencing the phytoavailability of cadmium(Cd) in agricultural soils.Methods We developed a model that simulates the transport by diffusion and convection, the kinetics ofsorption and complexation in solution and the root uptake of Cd. The ranking of mechanisms was performed by simulating the Cd2+ uptake by 1 cm2 root for 30 days for French agricultural soil characteristics.Results The initial Cd2+ concentration was the most influential parameter followed by the soil buffer power for Cd2+ and by the soil water content and impedance factor. The Cd2+ was generally strongly depleted at theroot surface and the convection was almost negligible. In general, the Cd complex dissociation contributedlittle to the uptake due to a strong kinetics limitation. Conversely, the kinetics of sorption was little influential.Conclusions The initial concentration and diffusion of Cd2+ were the dominant processes governing the phytoavailability in non-polluted soils. A model considering only the transport and sorption of Cd2+ without kineticswould be adequate to predict the phytoavailability. The particular situations where these simplifications do nothold (relative error >10 %) corresponded to a high supply of labile Cd complex toward plant roots

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“…In turn, metal distribution is usually affected by soil physicochemical properties such as pH, Eh, organic matter content, Fe/Al/Mn-(hydr)oxides and dissolved organic carbon (DOC) in the soil solution (de Vries et al 2011;Groenenberg et al 2010;Fest et al 2008). Some of these properties can change with variation in soil moisture content and thus change soil metal availability (Cornu et al 2007). Studies have shown that water management can change soil metal mobility and availability and thus manipulate metal accumulation in rice plants (Yang et al 2009;Hu et al 2013;Xu et al 2013).…”

Section: Responsible Editor: Yong Sik Okmentioning

confidence: 99%

“…The DOC changes in soil wetting-drying processes were very complex, and both chemical and biochemical mechanisms may be involved. Soil Eh will change greatly during the soil wetting-drying processes (Cornu et al 2007;Yamaguchi et al 2011;Shaheen et al 2014a, b). Studies find that DOC concentration usually decreases with increasing soil Eh (Grybos et al 2007;Yu et al 2007;Frohne et al 2014).…”

Section: Changes In Soil Solution Docmentioning

confidence: 99%

Effects of soil drying and wetting-drying cycles on the availability of heavy metals and their relationship to dissolved organic matter

Zhang

et al. 2015

J Soils Sediments

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Purpose Variation in soil moisture content can change metal availability. However, the effects of soil drying during wetting-drying cycles on metal availability have been little investigated. Metal availability to an imposed sink can be assessed by the diffusive gradients in thin film (DGT) technique. The purpose of this study was therefore to investigate the effects of the soil drying processes and previous soil moisture contents on metal availability using DGT. Materials and methods Two metal-polluted agricultural soils with contrasting pH (one acid and one calcareous) were collected from agricultural fields and were repeatedly phytoextracted with a Zn/Cd hyperaccumulator. Both soils, with and without phytoextraction, were subjected to two soil drying processes, i.e. drying from flooded conditions to 50 % maximum water holding capacity (WHC) and drying from 100 to 30 % WHC. Changes in metal availability induced by changing soil water moisture were examined using DGT.Results and discussion In acid soils, the availability of cadmium (Cd), zinc (Zn) and nickel (Ni) (but not copper) increased with drying from saturation to 50 % WHC. Drying soil from 100 to 30 % WHC had weak or no significant effects on available metals. Availabilities of Cd, Ni and Zn correlated well with available Al for both drying conditions. In calcareous soil, a decreasing trend of metal availability with soil drying from saturation to 50 % WHC or from 100 to 30 % WHC was found. Soils were also subjected to different wetting-drying cycles prior to drying. In acid soil, available copper (Cu) was correlated with dissolved organic carbon (DOC). Available Cd, Ni and Zn were correlated with available Al and increased with soil wetting-drying cycles in phytoextracted soil, but not in nonremediated soil. In calcareous soil, available Cu and Ni were correlated well with DOC and were higher with long dry periods. However, available Cd and Zn were lower in soils dried from the cycle of saturation to 50 % WHC. Conclusions The results indicate that soil water regimes can be manipulated to alleviate soil metal availability, but they must be tailored to individual metals and different soil types, and soil moisture content before drying should be considered when dried soils are used for evaluation of metal availability.

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Temporal evolution of redox processes and free Cd dynamics in a metal-contaminated soil after rewetting

Cited by 52 publications

References 18 publications

Temporal variability of solution Cd2+ concentration in metal-contaminated soils as affected by soil temperature: consequences on lettuce (Lactuca sativa L.) exposure

Temporal variability of solution Cd2+ concentration in metal-contaminated soils as affected by soil temperature: consequences on lettuce (Lactuca sativa L.) exposure

Ranking of mechanisms governing the phytoavailability of cadmium in agricultural soils using a mechanistic model

Effects of soil drying and wetting-drying cycles on the availability of heavy metals and their relationship to dissolved organic matter

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