The role of organic amendment in soils affected by residual pollution of potentially harmful elements

Aragón, Manuel Sierra; Nakamaru, Yasuo; García-Carmona, Minerva; Garzón, F.J. Martínez; Peinado, F. Martín

doi:10.1016/j.chemosphere.2019.124549

Cited by 24 publications

(11 citation statements)

References 59 publications

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“…The reduction in solubility is very strong after the application of the remediation treatments (2004), and this reduction is maintained over time in the case of T1 and T2 treatments but increases in T3 and T4 treatments. This increase in soluble forms was mainly observed for Pb and As, which in these soils seem to be related to the competing effects with soil organic matter (Sierra et al, 2019). On the other hand, the reduction in bioavailability is greater for all treatments applied, and this reduction strongly increases over time, indicating a general reduction in the availability of PHEs throughout the study area regardless of the treatments applied.…”

Section: Solubility and Availability Of Phes In Soilsmentioning

confidence: 87%

“…The increase in mobility observed in Pb could be related to the higher vegetation development where T3 and T4 treatments were applied and the affinity of the organic matter to form organic complexes with Pb easily extracted with EDTA (Sierra, Mitsui, García-Carmona, Martínez, & Martín Peinado, 2019). In the case of As, it does not form stable complexes with EDTA (Přibil, 1982), which could explain the low values of bioavailability extracted.…”

Section: Solubility and Availability Of Phes In Soilsmentioning

confidence: 99%

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Long‐term assessment of remediation treatments applied to an area affected by a mining spill in Spain

et al. 2021

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This study evaluated the effectiveness of remediation treatments in the long-term (20 years) for one of the largest mine spills in the world, the Aznalcóllar accident. Soil recovery was carried out through the application of various rates of organic (compost and manure) and inorganic amendments (materials rich in iron oxides and calcium carbonate). Different amendment combinations were grouped in four treatments (T1 to T4) and applied in different sectors depending on the soil properties and the degree of initial contamination. To assess the degree of soil recovery, physicochemical properties, total, water-soluble, and bioavailable concentrations of the main contaminants (Pb, As, Zn, and Cu) were determined over time. Applied treatments increased pH, calcium carbonate, and organic carbon content of soils, reduced electrical conductivity, and decreased mobility of contaminants, indicating that remediation treatments were efficient recovering soils contaminated by potentially harmful elements (PHEs).However, 20 years after the accident, total concentrations of Pb and As still exceed the intervention levels of the current regulations in certain areas. These areas are located in the sectors closest to the mine and where treatments T1 and T2 were applied. In these cases, the added doses of organic amendments, iron oxide-rich soils, and carbonate amendments were not sufficiently effective, so the application of new treatments is recommended to complete the total recovery of the Guadiamar Green Corridor.

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Section: Solubility and Availability Of Phes In Soilsmentioning

confidence: 87%

Section: Solubility and Availability Of Phes In Soilsmentioning

confidence: 99%

Long‐term assessment of remediation treatments applied to an area affected by a mining spill in Spain

et al. 2021

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show abstract

“…In the case of the solubility of the studied elements, the reduction is very strong after the application of the remediation treatments (2004), although this reduction is maintained over time in the case of T1 and T2 treatments, but increases in T3 and T4 treatments. This increase in soluble forms were mainly observed for Pb and As, which in these soils seem to be related to the competing effects between these elements and the soil organic matter content (Sierra et al, 2019). In the case of bioavailability, the reduction is greater for all treatments applied and this reduction strongly increases over time, indicating a general reduction in the availability of potentially harmful elements throughout the study area regardless of the treatments applied.…”

Section: Solubility and Availability Of Contaminants In Soilsmentioning

confidence: 88%

“…The behavior observed in Pb could be related to the higher vegetation development where T3 and T4 treatments were applied and the affinity of the organic matter to form organic complexes with Pb easily extracted with EDTA (Sierra et al, 2019). In the case of As, it does not form stable complexes with EDTA (Přibil, 1982), which could explain the low values of bioavailability extracted.…”

Section: Solubility and Availability Of Contaminants In Soilsmentioning

confidence: 99%

Long-term assessment of remediation treatments applied to an area affected by a mining spill

uregui

pez

Aguilar-Garrido

et al. 2020

Preprint

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This study evaluates the effectiveness of remediation treatments in the long-term (twenty years later) in one of the largest mine spills in the world, the Aznalcóllar accident. Soil recovery was carried out through the application of different rates of organic (compost and manure) and inorganic amendments (materials rich in iron oxides and calcium carbonate). The different amendment combinations were grouped in four treatments (T1 to T4) and applied in different sectors depending on the soil properties and the degree of initial pollution. To assess the degree of soil recovery, the physicochemical properties, the total, soluble and bioavailable concentrations of the main pollutants (Pb, As, Zn and Cu) were determined over time. The applied treatments increased the pH, CaCO3 and organic carbon of the soils, reduced the EC and decreased the mobility of the pollutants, indicating that remediation treatments were efficient in the recovery of soils contaminated by potentially harmful elements. However, twenty years after the accident, total concentrations of Pb and As still exceed the intervention levels of the current regulations in certain areas. These areas are located in the sectors closest to the mine and where treatments T1 and T2 were applied; in these cases, the dose of organic amendment, materials rich in iron oxides and calcium carbonate were not effective enough, so the application of new treatments is recommended to complete the full recovery of the area.

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“…The mechanisms involved in the immobilization of metal(loid)s caused by biochar addition are different, depending mainly on the characteristics of the soil, the biochar used and the type of metal(loid)s present [26]. Although soil pH may explain the behavior of some of the metal(loid)s studied in relation to their mobility it is worthy to mention that immobilization of metals is also related to the ability of organic matter to bind these elements [60]. Thus, not only may biochar reduce the metal(loid)s mobility by an increase of the soil pH but also by the addition of organic matter to soil.…”

Section: Soluble and Bioavailable Formsmentioning

confidence: 99%

Application of Biochar for the Restoration of Metal(loid)s Contaminated Soils

2022

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Biochar has recently aroused great interest for the restoration of contaminated soils since it improves soil properties and induces the immobilization of pollutants. This study evaluates the use of biochar from plant pruning, applied as an amendment, for immobilizing metal(loid)s in a highly contaminated soil as well as for reducing the phytotoxicity of these pollutants by promoting natural revegetation. For this purpose, a bioassay with Trifolium pratense L. was used to test the effectiveness of the soil amendment in greenhouse conditions. Three treatments were carried out including soil contaminated with metal(loid)s (RA), and this soil was amended with biochar at different dosage: 4% (RA4B) and 8% (RA8B). A non-contaminated soil (NC) from a nearby area not affected by contamination was used as a control. The results show that biochar increased soil pH by several units depending on the dose used, 8% being the most effective one. Biochar treatments also reduced soluble and bioavailable forms of Zn and Cu. Likewise, phytotoxicity was significantly reduced, promoting seed germination and biomass with plant growth values similar to the non-polluted soil. In light of the results obtained, the evaluation of the bioremediation potential of biochar under field conditions can be considered.

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The role of organic amendment in soils affected by residual pollution of potentially harmful elements

Cited by 24 publications

References 59 publications

Long‐term assessment of remediation treatments applied to an area affected by a mining spill in Spain

Long‐term assessment of remediation treatments applied to an area affected by a mining spill in Spain

Long-term assessment of remediation treatments applied to an area affected by a mining spill

Application of Biochar for the Restoration of Metal(loid)s Contaminated Soils

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