Copper and Lead

Hough, Rupert

doi:10.1002/9781444319477.ch18

Cited by 16 publications

(4 citation statements)

References 121 publications

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“…Copper (Cu) and Cobalt (Co) are trace metal elements in soils, and their presence depends on their parent materials (Hough, 2010;Ma and Hooda, 2010). Average total content in soil is around 30 mg kg −1 dry weight for Cu and 8 mg kg −1 for Co with slight differences between Geographical Zones (Alloway, 1995;Aubert and Pinta, 1980;Hough, 2010;Lopes, 1980;McLean and Bledsoe, 1992). Depending on the soil properties, a proportion of total metal concentration is available for plants and microbes (Degryse et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Ecological niche distribution along soil toxicity gradients: Bridging theoretical expectations and metallophyte conservation

Boisson

Monty

Séleck

et al. 2020

Ecological Modelling

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Ecological niche modelling helps us to understand the spatial assembly of species in heterogeneous environments. Three patterns have been widely reported in the research literature regarding the relationship between realised niches and macronutrient concentration gradients: (1) species' optima are unevenly distributed, with a higher frequency in mesic conditions; (2) species' response curves are narrower when optima density is higher; and (3) species with optima at the extremes of the gradients have skewed response curves with a longer tail toward mesic conditions. This study aims to test the existence of these patterns on a vegetation model occurring in metalliferous soils comprising copper and cobalt along a toxicity gradient in southeastern D.R. Congo. Realised niches of 80 taxa were modelled using generalised additive models. The niche optima and the niche widths were determined for each taxon. Results highlighted three groups which differ according to the niche optima location along the soil metal concentration gradients. The patterns found along macronutrient concentration gradients were, to some extent, transposable along micronutrient concentration gradients. Our findings on the diversity and assembly of realised niches has consequences for plant conservation strategies.

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Section: Introductionmentioning

confidence: 99%

Ecological niche distribution along soil toxicity gradients: Bridging theoretical expectations and metallophyte conservation

Boisson

Monty

Séleck

et al. 2020

Ecological Modelling

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“…Acanthite (Ag 2 S), one of the most abundant Ag species found at the earth’s surface, is typically not included in considerations of the pools of highly reactive, bioavailable Ag and Ag complexes. However, the ubiquitous presence of Cu(I) in natural environments makes Ag 2 S a potentially important source of silver in contaminated and pristine soils, sediments, and waters, in addition to serving as an antidote. Thus, the results of our study have important implications for the chemistry and biology of silver-contaminated environments.…”

Section: Resultsmentioning

confidence: 99%

Copper(I) Promotes Silver Sulfide Dissolution and Increases Silver Phytoavailability

Huang

Liu

Cui

et al. 2020

Environ. Sci. Technol.

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Metal sulfides, including acanthite (Ag2S), are persistent in the environment. In colloidal form, however, they can serve as a “Trojan horse”, facilitating the mobility of trace metal contaminants. The natural processes that lead to the in situ dissolution of colloidal metal sulfides in soil are largely unknown. In this study, the dissolution of colloidal Ag2S in topsoil and Ag phytoavailability to wheat were examined in Ag2S–Cu(II)–thiosulfate systems. Cu(II) and thiosulfate strongly increased silver release (up to 83% of total Ag) from Ag2S in the dark. Electron paramagnetic resonance, X-ray photoelectron spectroscopy, and Cu K-edge X-ray absorption spectroscopy identified Cu(I) as the driving force of Ag2S dissolution. Density functional theory calculations further demonstrated the ability of Cu(I) to substitute for surface Ag on Ag2S in an energetically favorable manner. However, excess Cu(II) could enhance the formation of precipitates containing Cu(I), Ag, and S. Our results indicate that at ambient temperature and in the dark, Cu(I) can promote the dissolution of Ag2S and act as a precipitating agent. These findings reveal previously unrecognized biogeochemical processes of colloidal Ag2S and their importance in determining the fate of metal sulfides in the environment and probably also in vivo.

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“…Excessive Cu supply causes potential toxicity and yield depression [1]. Lead is well known as a major soil contaminant and potentially toxic element that adversely affect human and animal health [2]. Tóth et al [3] recounted the threshold values for Cu and Pb in agricultural soils as 100 and 60 mg kg −1 , respectively, according to their ecological or health risks.…”

Section: Introductionmentioning

confidence: 99%

Multireaction Modeling of Lead (Pb) and Copper (Cu) Sorption/Desorption Kinetics in Different Soils

Elbana

Selim

2019

Soil Systems

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Batch kinetic experiments were carried out to quantify and describe the sorption/desorption of Cu and Pb in ten soils that exhibited a wide range of properties. Sorption isotherms were quantified using the Langmuir equation, whereas modeling of sorption/desorption kinetics was described using multireaction model (MRM). Results revealed the nonlinear sorption behavior of Cu and Pb in all soils. The ten soils exhibited higher affinity to Pb (6.4 to 36.5 mmol kg−1) in comparison to Cu (3.6 to 22.4 mmol kg−1). Simulation of Cu and Pb kinetic data indicated that the rate of sorption reaction was two orders of magnitude higher than the rate of release. Considering one irreversible site in addition to one-reversible kinetic site improved the estimation of rates of reaction for both Cu and Pb in acidic and alkaline soils. All soils exhibited sorption/desorption hysteresis where Pb-releases ranged between <0.2% and 14.4% of the total sorbed. The respective Cu releases ranged from <0.85% and 23.4%. The multireaction model, which was successful in describing Cu and Pb for all ten soils, provided insight into the processes of sorption/desorption of Cu and Pb in all soils.

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Copper and Lead

Cited by 16 publications

References 121 publications

Ecological niche distribution along soil toxicity gradients: Bridging theoretical expectations and metallophyte conservation

Ecological niche distribution along soil toxicity gradients: Bridging theoretical expectations and metallophyte conservation

Copper(I) Promotes Silver Sulfide Dissolution and Increases Silver Phytoavailability

Multireaction Modeling of Lead (Pb) and Copper (Cu) Sorption/Desorption Kinetics in Different Soils

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