Interaction of limestone grains and acidic solutions from the oxidation of pyrite tailings

Simón, M.; Martı́n, Francisco; Fernández, Inés García; Bouza, Pablo José; Dorronsoro, Carlos; Aguilar, J.

doi:10.1016/j.envpol.2004.10.013

Cited by 75 publications

(42 citation statements)

References 21 publications

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“…The same eVects were observed in previous studies with this species in Weld conditions (Vázquez et al 2006). The oxidation of large amounts of sulWde contained in the mine sludge and in consequence the progressive acidiWcation of the soils of the Aznalcól-lar spill-aVected area has been widely demonstrated (Simón et al 2005). The toxic symptoms appearing in the plants from soil sample 5 suggested a threshold pH for satisfactory growth of lupins slightly above 3.…”

Section: Discussionsupporting

confidence: 68%

Bioavailability of metals and As from acidified multicontaminated soils: Use of white lupin to validate several extraction methods

Vázquez

Moreno

Carpena

2008

Environ Geochem Health

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White lupin is an annual crop that has been used for phytostabilization of acidified multicontaminated (heavy metals and As) soils from the Aznalcóllar spill-affected area, Southern Spain. One of the most important factors for successful phytostabilization is monitoring the pollutant bioavailability in the soil. The aim of this work was to determine the best-suited method for assessing the bioavailability of heavy metals together with As in the Aznalcóllar spill-affected area, by means of a systematic comparison between different extraction methods (Ammonium bicarbonate-diethylenetriamine pentaacetic acid (AB-DTPA), CaCl2, NaNO3, BCR, (NH4)2SO4 and rhizo). Both AB-DTPA and the first step of the BCR method were found to be unsuitable for assessing the bioavailability of heavy metals and As to plants growing in acidic soils. However, CaCl2-extractable As, Cu, and Zn and NaNO3-extractable As and Zn were well correlated with their concentrations in plant organs. Rhizo and (NH4)2SO4, with the highest determination coefficients, were the most recommended simple extraction methods to assess the bioavailability of As, Cu, Fe, Mn, and Zn in acidified multicontaminated soils using white lupin as an excluder model plant.

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Section: Discussionsupporting

confidence: 68%

Bioavailability of metals and As from acidified multicontaminated soils: Use of white lupin to validate several extraction methods

Vázquez

Moreno

Carpena

2008

Environ Geochem Health

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“…The addition of compost alone reduced porewater and CaCl 2 -extractable metal concentrations, indicating the importance of adsorption to the added organic matter (Sekaly et al 1999). The combination of compost with marble sludge, except for Cu, was more effective in decreasing metal concentrations in the extracts, which can be attributed to a significant increase in soil pH and subsequent precipitation (Simón et al 2005). Compared with these treatments, the addition of Fe oxides did not significantly affect porewater Fig.…”

Section: Soil Characteristicsmentioning

confidence: 75%

Application of bioassays with Enchytraeus crypticus and Folsomia candida to evaluate the toxicity of a metal-contaminated soil, before and after remediation

et al. 2011

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Purpose A contaminated soil was amended to reduce bioavailability of metals (As, Cd, Cu, Pb, and Zn) and to modify its potential environmental impacts. Reproduction toxicity tests using two different soil invertebrates, Enchytraeus crypticus and Folsomia candida, were used to evaluate efficiency of soil amendments to reduce metal availability. Materials and methods This study has been carried out on a very contaminated soil from El Arteal mining district (SE Spain). The amendments used were marble sludge from the cutting and polishing of marble, compost from greenhouse wastes, and synthetic iron oxides. Soils were analyzed for cation exchange capacity, organic carbon and calcium carbonate content, particle size distribution, pH, electrical conductivity, and total metal content. Porewater and 0.01 M CaCl 2 -extractable concentrations were measured in unamended and amended soils. Soil organisms were exposed to all treatments and to untreated soil. The parameters evaluated in both bioassays were survival and reproduction. Results and discussion All treatments decreased the porewater and CaCl 2 -extractable concentrations of Zn, Pb, Cd, and Cu. The amendments increased survival and reproduction of E. crypticus, reducing toxicity. Survival of F. candida was also increased by the treatments; its reproduction did, however, not improve. These differences may be due to other factors that may affect collembolan reproduction. The different sensitivity of each test organism to some soil properties such as pH and electrical conductivity, which can affect reproduction, should be considered before interpreting results from bioassays focussed on toxicity due to pollutants. Conclusions Reproduction toxicity bioassays with soil invertebrates are a good complement of chemical analysis to properly assess the ecological risk of remediation processes. Organisms with different exposure routes and different sensitivities to soil properties should be used simultaneously to assess the environmental risk of metalcontaminated sites and to evaluate the effectiveness of remediation processes.

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“…A review of the literature shows that the effluent from sulphide mineral containing tailings without sufficient buffer capacity, such as those resulting from the gold mining activities in the Witwatersrand are acidic in nature and contain elevated concentrations of trace metals and SO 4 (Dold and Fontboté, 2001;Gleisner and Herbert, 2002;Naicker et al, 2003;Simón et al, 2005;Nengovhela et al, 2007;Gunsinger et al, 2006;Tutu et al, 2008).…”

Section: Conceptual Geochemical Model For the Witwatersrand Gold Basimentioning

confidence: 99%

Contaminant leaching from gold mining tailings dams in the Witwatersrand Basin, South Africa: A new geochemical modelling approach

Hansen

2015

Applied Geochemistry

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Interaction of limestone grains and acidic solutions from the oxidation of pyrite tailings

Cited by 75 publications

References 21 publications

Bioavailability of metals and As from acidified multicontaminated soils: Use of white lupin to validate several extraction methods

Bioavailability of metals and As from acidified multicontaminated soils: Use of white lupin to validate several extraction methods

Application of bioassays with Enchytraeus crypticus and Folsomia candida to evaluate the toxicity of a metal-contaminated soil, before and after remediation

Contaminant leaching from gold mining tailings dams in the Witwatersrand Basin, South Africa: A new geochemical modelling approach

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