Modeling uptake kinetics of cadmium by field-grown lettuce

Chen, Weiping; Li, Lianqing; Chang, Andrew C.; Wu, Laosheng; Kwon, Soon‐Ik; Bottoms, Rick

doi:10.1016/j.envpol.2007.05.004

Cited by 19 publications

(13 citation statements)

References 22 publications

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“…Foods coming from various sources are intermingled in the market places and in food acquisition the consumers typically have no knowledge of their origin. In terms of exposure, differences in plant uptake caused by these factors are simply temporal and spatial variability due to production fields where the crops come from (Chen et al, 2008). In risk assessments, the PUF needs to reflect the realities of crop production and consumption patterns.…”

Section: Introductionmentioning

confidence: 99%

Characterizing the solid–solution partitioning coefficient and plant uptake factor of As, Cd, and Pb in California croplands

Chen

Chang

et al. 2009

Agriculture, Ecosystems & Environment

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Section: Introductionmentioning

confidence: 99%

Characterizing the solid–solution partitioning coefficient and plant uptake factor of As, Cd, and Pb in California croplands

Chen

Chang

et al. 2009

Agriculture, Ecosystems & Environment

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“…(5), D L and D ML are the diffusion coefficients of the ligand and the Cd complex in water (cm 2 s −1 ), respectively, k ads L and k ads ML are the rate constants of adsorption from liquid phase onto solid phase for the ligand and the Cd complex (s −1 ), respectively, k des L and k des ML are the rate constants of desorption from solid phase to liquid phase for the ligand and the Cd complex (s −1 ), S L and S ML are the concentration of the ligand and the Cd complex sorbed onto solid phase (μmol cm −3 soil), respectively. At the root surface, only Cd 2+ is absorbed following Michaelis-Menten kinetics (Chen et al 2008;Panfili et al 2009) and so, the boundary fluxes are:…”

Section: Methodsmentioning

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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“…By integrating the Michaelis-Menten and the uptake kinetics models, Chen et al (2008Chen et al ( , 2009b characterized the Cd uptake by lettuce (Lactuca sativa L.) plants grown on an Entisol. The root density of growing plant is a function of its above ground biomass.…”

Section: Conceptual Considerationsmentioning

confidence: 99%

Trace element uptake dynamics for maize (Zea mays L.) grown under field conditions

Molina

Escudey

Chang³

et al. 2013

Plant Soil

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Background and aims The trace element uptake process of plants is a key factor in assessing the risks of trace element build-up in agricultural soils. Scarce information exists on the trace element dynamic uptake of plants grown in the field, especially on those potentially hazardous. In this study, the uptake process of As, Cd, Cu, and Zn in maize plants was quantified and characterized throughout the entire season. Methods Along two seasons, the uptake dynamics of field-grown maize plants in absorbing the soil borne trace elements was examined. Biomass production and the concentration of the elements in plant and soil solution samples were determined. A kinetic model was employed to characterize the uptake by plants. ResultsThe kinetic parameters of the uptake process, maximum cumulative uptake rate, U max , time to reach 50 % of U max , t U50 , and reciprocal of the uptake rate, b U when followed throughout the season in terms of the plant's growing degree days remained constant between seasons and were element specific. In spite of the large amount biomass produced, maize plants extracted minute quantities of Cd and As. Increasing cumulative uptake rates of As, Cd, Cu, and Zn from the soil took place primarily in the early half of the growing season when the biomass accumulation was still less than 50 % of the maximum harvested biomass. The element-specific plant uptake factor (PUF), which denote the partition of trace elements between the soil solution and plant phases, decreased following Center for the Development of Nanoscience and Nanotechnology, CEDENNA, Santiago 9170124, Chile a first-order kinetics along the growing period, did not show any significant difference between seasons, and, a t m a t u r i t y s t a g e , f o l l o w e d t h e s e q u e n c e Cd≥Zn>Cu≥As. Conclusions The uptake process of the elements was adequately described by the kinetic model, showing similar patterns but different magnitude and distribution in the plant. The extraction of Cd and As by plants is low in comparison to common inputs through fertilizer applications into maize production systems, indicating potential risk of trace element accumulation in soils. The PUF may be estimated according to the kinetics parameters of the uptake process. On a per-unit-soil solution element basis, Cd and Zn would be more susceptible to the soil-to-plant transfer than As and Cu.

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Modeling uptake kinetics of cadmium by field-grown lettuce

Cited by 19 publications

References 22 publications

Characterizing the solid–solution partitioning coefficient and plant uptake factor of As, Cd, and Pb in California croplands

Characterizing the solid–solution partitioning coefficient and plant uptake factor of As, Cd, and Pb in California croplands

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

Trace element uptake dynamics for maize (Zea mays L.) grown under field conditions

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