Evaluation of the impact of organic matter composition on metal speciation in calcareous soil solution: Comparison of Model VI and NICA-Donnan

Ponthieu, Marie; Pourret, Olivier; Marin, Béatrice; Schneider, Arnaud; Morvan, Xavier; Conreux, Alexandra; Cancès, Benjamin

doi:10.1016/j.gexplo.2016.01.017

Cited by 16 publications

(13 citation statements)

References 39 publications

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“…The combined binding of Pb to Fe and Mn oxides and the carbonate fraction may be explained by a higher near-neutral soil pH, attributed to the buffering by carbonate minerals found in mine tailings. Lead mobility may be also constrained by its complexation with organic matter [41,42]. Indeed, at slightly acidic pH values (i.e., 4 < pH < 6), a portion of the reactive functional groups within the organic matter matrix can become protonated, generating the release of otherwise bound Pb through a H + /Pb 2+ competition reaction, which in turn would depend on acidity and metal sorption constants as indicated previously for Cd [43].…”

Section: Sequential Extraction Of CD Cu and Pb From Cam Pha Rice Padmentioning

confidence: 92%

Effect of Cadmium, Copper and Lead on the Growth of Rice in the Coal Mining Region of Quang Ninh, Cam-Pha (Vietnam)

et al. 2018

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The goal of this study was to quantify the mobility and partitioning of trace elements originating from mine waste rocks derived from open pit coal extraction activities. The results showed that native rice plants were adapted to growing in metal contaminated soils, posing a severe health risk to local population. Sequential extraction procedures and bulk soil chemical analyses both suggest enrichment of Cd, Pb and Cu in rice paddy soils. Lead was shown to be evenly partitioned among all mineral and organic phases. Copper was associated with carbonates and organic matter. Smaller fractions of Pb and Cu were also bound to Fe and Mn oxides. Only 25% of Cd, 9% of Pb and 48% of Cu were associated with the exchangeable fraction, considered mobile and thus bioavailable for plant uptake. Effects of Cd, Cu and Pb on local Cam Pha Nep cai Hoa vang, and control Asia Italian rice, showed marked differences in growth. The local Vietnamese variety grew close to control values, even upon exposure to higher trace metal concentrations. Whereas the development of the control rice species was significantly affected by increasing trace metal concentrations. This result suggests toxic trace elements accumulation in the edible parts of crops.Waste rock material derived from open pit coal mining contains significant concentrations of reduced sulfides. These include pyrite (FeS 2 ), chalcopyrite (CuFeS 2 ) and other metal sulfides, including covellite (CuS), chalcocite (Cu 2 S) and galena (PbS). The Cd containing sulfide, greenockite (CdS), has been found to be frequently associated with sphalerites and wurtzites [(Zn,Fe)S] [11]. The chemical weathering of these minerals enhances the solubility, mobilization and bioavailability of trace metals [11]. In contaminated areas, these elements may be transported by colloidal or suspended particulates present in water used to irrigate agricultural land [12].Trace elements in soils have detrimental effects on the growth of staple crops (e.g., rice, barley, garlic, wheat, maize) [13][14][15][16], and can accumulate in their edible parts posing a serious health risk to humans [8,[17][18][19]. Cadmium, Cu and Pb have been identified as having adverse effects on rice (Oryza sativa L.) and wheat (Triticum aestivum L.) growth [16,17,[20][21][22]. In addition, toxic metal tolerance in crop varieties has been shown in rice, sunflower, wheat and leguminous species, leading to an increment in metal uptake and to their concentration in edible plant parts, posing a severe health risk [8,23,24].In this study, a first approach quantifies metal fractionation and mobility in mine waste rock and rice paddy soil samples, from the open-pit coal mining region of Quang Ninh, (Vietnam). A second part of the study focuses on determining the effect of mobile toxic elements (e.g., Cd, Cu, Pb) on the growth of native and control rice plant varieties.

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Section: Sequential Extraction Of CD Cu and Pb From Cam Pha Rice Padmentioning

confidence: 92%

Effect of Cadmium, Copper and Lead on the Growth of Rice in the Coal Mining Region of Quang Ninh, Cam-Pha (Vietnam)

et al. 2018

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“…For example, Zhu and Guéguen [11] adjusted FA:HA ratio from 1:0 to 1:1 to compute free Cu 2+ concentration via WHAM VII, and found a very small effect on it when Cu bound to DOM was > 99%. However, Ponthieu et al [10] concluded that FA:HA ratio ranging from 1:0 to 0:1 influenced up to an order of magnitude of free Cu 2+ concentration due to HA with log CuHA (2.38) complexed more Cu than FA with log CuFA (2.16). In our study, assuming HA in WHAM VI as active DOM instead of FA at the best optimized %AFA (10-125%), the predicted free Cu 2+ activity was approximately 1.6 orders of magnitude lower than measured values even for these samples with higher proportion of organic complexes.…”

Section: Distribution Of Cu In Soil Pore Water and Soil Solidmentioning

confidence: 99%

“…Vulkan et al [14] found that 69% AFA used in WHAM VI could ensure predicted free Cu 2+ in soil solution closer to measured values, but this ratio was only consistent to that for alkaline soils, not acidic soils in our study. Some studies also used certain %HA as active DOM [10,46] to predict Cu speciation. For example, Zhu and Guéguen [11] adjusted FA:HA ratio from 1:0 to 1:1 to compute free Cu 2+ concentration via WHAM VII, and found a very small effect on it when Cu bound to DOM was > 99%.…”

Section: Distribution Of Cu In Soil Pore Water and Soil Solidmentioning

confidence: 99%

“…Similarly, Ponthieu et al [10] evaluated the impact of DOM composition in Cu speciation in 36 calcareous soil solutions (pH 7.0-8.4) using WHAM VI and NICADonnan, and difference of free Cu 2+ predicted by two models was enlarged with increase of pH. The difference of free Cu 2+ prediction might be related to the distinction of intrinsic property in these two humic substances models.…”

Section: Distribution Of Cu In Soil Pore Water and Soil Solidmentioning

confidence: 99%

“…Also, it is one of the most affinity metals to humic substances compared with others [8][9][10]. It was reported that humic complexed form accounted for up to 99.9% of total Cu in solution [3,8,11] indicating that Cu speciation is extremely sensitive to humic substances heterogeneity in quantity and quality [12,13].…”

Section: Introductionmentioning

confidence: 99%

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Environmentally friendly remediation of lead/cadmium co-contaminated loess soil in northwestern China using a humificated straw solution

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The remediation of heavy metal-contaminated soils is a great challenge and an important issue for global environmental sciences and engineering. Soil washing technology is popularly used for soil remediation, but there are issues that must be solved. These include selecting an environmentally friendly washing solution and preventing damage to the soil during the washing process. The aim of the present work is to reveal the effects of operational conditions on soil remediation contaminated by lead/cadmium, and the effects on soil physicochemical properties caused by the washing reaction. A loess soil sample was collected from northwestern China, and a humificated straw solution was used as the washing solution. The remediation efficiency was investigated using a small-scale experimental device. The remediation efficiency could be improved by optimizing the operational conditions, and we found that the Elovich equation fits better the reaction process compared to the double-constant equation and the first-order kinetics equation. The washing rate of cadmium was slightly faster than that of lead. Compared to the topsoil in the column, the concentration of lead/cadmium was higher in the bottom soil, and the content of lead/cadmium in the inner layer soil was lower than that in the outer layer soil. The washing process had little influence on the surface characteristics and functional groups of soil. The humificated straw solution could be used effectively to remove lead/cadmium and preserve nutrients in loess soil.

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Evaluation of the impact of organic matter composition on metal speciation in calcareous soil solution: Comparison of Model VI and NICA-Donnan

Cited by 16 publications

References 39 publications

Effect of Cadmium, Copper and Lead on the Growth of Rice in the Coal Mining Region of Quang Ninh, Cam-Pha (Vietnam)

Effect of Cadmium, Copper and Lead on the Growth of Rice in the Coal Mining Region of Quang Ninh, Cam-Pha (Vietnam)

Is the computed speciation of copper in a wide range of Chinese soils reliable?

Environmentally friendly remediation of lead/cadmium co-contaminated loess soil in northwestern China using a humificated straw solution

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