Changes in trace metal species and other components of the rhizosphere during growth of radish

Hamon, Rebecca; Lorenz, S. E.; Holm, Peter E.; Christensen, Thomas Højlund; McGrath, Steve P.

doi:10.1111/j.1365-3040.1995.tb00577.x

Cited by 78 publications

(27 citation statements)

References 33 publications

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“…The complexation of Mn 2+ by malate was also reported to increase its mobility and bioavailability in the rhizosphere by preventing Mn oxidation in an uncontaminated soil (Jauregui and Reisenauer, 1982). Further evidence for the complexation of free heavy metal ions by dissolved organic substances in the rhizosphere have been provided by Hamon et al (1995) (Figure 7.12), Lorenz et al (1997), and Legrand et al (2005).…”

Section: Impact Of Organic Substances On the Speciation Of Trace Elemmentioning

confidence: 77%

Biogeochemistry of Metals and Metalloids at the Soil–Root Interface

Hinsinger

Courchesne

2007

Biophysico‐Chemical Processes of Heavy Metals and Metalloids in Soil Environments

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Section: Impact Of Organic Substances On the Speciation Of Trace Elemmentioning

confidence: 77%

Biogeochemistry of Metals and Metalloids at the Soil–Root Interface

Hinsinger

Courchesne

2007

Biophysico‐Chemical Processes of Heavy Metals and Metalloids in Soil Environments

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“…The application of chelating agents, e.g., EDTA, has been proved to enhance the translocation of metals from the root to shoot (Barber and Lee 1974;Hamon et al 1995;Vassil et al 1998;Gleba et al 1999;Safari Sinegani and Khalilikhah 2011). Despite significant changes in phytoextraction efficiency, in some researches, TF had not changed after treatment Safari Sinegani 2013, 2014).…”

Section: Effects Of Chelating Agents On Translocation Factors Of Metamentioning

confidence: 98%

Chelating Agents and Heavy Metal Phytoextraction

2015

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Elements with density higher than 5 g cm À3 have been called heavy metals. From the metallic elements that naturally exist, 53 elements belong to the heavy metal group. Some of these heavy metals, such as iron, manganese, copper, zinc, and molybdenum, are known as micronutrients in agriculture, since their amount in soil is low and the little quantity of them is necessary for plant growth. Another group of these elements, such as cobalt and vanadium, has been shown to be useful for plant growth. The other category, such as nickel, chromium, selenium, lead, and cadmium, has toxic effects on plant and other organisms even in low level. The mobility and uptake of these elements and the appearing of their negative effect in the environment depend on soil, water, and plant relations.The term "chelating agents" refers to ligands occupying multiple positions in the inner coordination of a metal ion. Heavy metals combine with one or more reactive groups or ligands like oxygen (-OH, -COO, -POO), nitrogen (-NH 2 , -NH), or sulfur (-SH, -S-S). The result of this phenomenon is the formation of soluble multidentate metal-chelant complexes called "chelates" (Fig. 20.1) which came from a Greek word "chele" meaning the claw of a crab or scorpion (Tsang et al. 2012).To know the increase of metal solubility in soil, it is important to figure out the metal ion-ligand interactions. The complex formation can be considered as equilibrium reaction between the ligand and the metal ion:

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“…Several authors (Cornu et al 2007b;Hamon et al 1995) propose that the integration of these temporal variations may improve the prediction of plant uptake. Our study confirmed this point as the Cd concentration in lettuce roots was more closely related to the root exposure to solution Cd (E Cd ) than to the initial concentration of Cd 2+ measured on day 0 (data not shown).…”

Section: Root CD Concentration Versus Root Exposure To Solution Cdmentioning

confidence: 99%

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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Changes in trace metal species and other components of the rhizosphere during growth of radish

Cited by 78 publications

References 33 publications

Biogeochemistry of Metals and Metalloids at the Soil–Root Interface

Biogeochemistry of Metals and Metalloids at the Soil–Root Interface

Chelating Agents and Heavy Metal Phytoextraction

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

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