Weathering of primary minerals and mobility of major elements in soils affected by an accidental spill of pyrite tailing

Martı́n, Francisco; Díez, M.C.; Fernández, Inés García; Simón, M.; Dorronsoro, Carlos; Iriarte, A; Aguilar, J.

doi:10.1016/j.scitotenv.2007.01.031

Cited by 31 publications

(22 citation statements)

References 7 publications

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“…The presence of siderite-like, Fe arsenate-like, and ferric oxyhydroxide compounds has been identified in soils and mine waste in calcareous sites under semi-alkaline conditions (Dorronsoro et al 2002;Razo et al 2004;Romero et al 2006Romero et al , 2011Martín et al 2007;Navarro et al 2008;García-Meza et al 2011;Labastida et al 2013;Hiller et al 2013;Molinari et al 2014). It is known that mine and hard rock waste can be stored in large dams, storage systems that are intended as permanent features of the landscape and environment systems.…”

Section: Discussionmentioning

confidence: 99%

“…The effect of accessible arsenic species during weathering reactions was also examined using cyclic voltammetry and S2 and S3, respectively) in an attempt to further assess the influence of predominant ion variations in calcareous systems (e.g., Nan and Zhao 2000;Dorronsoro et al 2002;Walker et al 2003Walker et al , 2006Martín et al 2007Martín et al , 2008Navarro et al 2008;Romero et al 2011;Labastida et al 2013). Figure S2 shows cyclic voltammograms conducted on CPE-arsenopyrite using a neutral-alkaline solution with supplementary arsenic species ("Solution to simulate weathering process" section) in a sulfate system (ESM, Fig.…”

Section: Influence Of Accessible Arsenic In Arsenopyrite Weathering Rmentioning

confidence: 99%

“…Metal extraction releases significant amounts of arsenopyrite (FeAsS) and other sulfide minerals (SM) containing potentially toxic elements (PTEs) including arsenic, lead, chromium, and cadmium into soils, surface and groundwater sources, and aquatic sediment. Hazardous phases and environmental conditions also contribute to compound weathering and may cause acid rock drainage (ARD) or the release of PTEs into the environment even when neutral-alkaline carbonated conditions are present (Castro-Larragoitia et al 1997;Dorronsoro et al 2002;Martín et al 2007Martín et al , 2008Martínez-Sánchez et al 2008;Navarro et al 2008). Secondary compounds formed during this process (e.g., FeOOH, FeCO 3 , and Fe-As bearing phases) are released into the environment where they may undergo further weathering (Martín et al 2007;Navarro et al 2008;García-Meza et al 2011;Labastida et al 2013;Molinari et al 2014).…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that the release of arsenic and other PTEs in saprolitic soils is typically related to their stability within primary, secondary, or tertiary compounds. However, stability can be influenced by several factors: physicochemical properties of soils, the adsorptive and dissolution mechanisms characteristic of the system (e.g., Lin et al 2008;Achiba et al 2009;Mehmood et al 2009), ARD (e.g., oxidation of arsenopyrite and SM phases), mass and charge transfer, and the continuous interfacial conversion of secondary compounds driven by humidity-dryness and acidic-neutralization cycles in calcareous soils (Martín et al 2007;Navarro et al 2008;García-Meza et al 2011;Romero et al 2011;Labastida et al 2013). Accordingly, it is critical to monitor and assess the mechanisms determining the arsenopyrite weathering throughout the chemical surface speciation and arsenic release.…”

Section: Introductionmentioning

confidence: 99%

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Arsenopyrite weathering under conditions of simulated calcareous soil

Lara¹,

Velázquez²,

Vazquez‐Arenas³

et al. 2015

Environ Sci Pollut Res

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Mining activities release arsenopyrite into calcareous soils where it undergoes weathering generating toxic compounds. The research evaluates the environmental impacts of these processes under semi-alkaline carbonated conditions. Electrochemical (cyclic voltammetry, chronoamperometry, EIS), spectroscopic (Raman, XPS), and microscopic (SEM, AFM, TEM) techniques are combined along with chemical analyses of leachates collected from simulated arsenopyrite weathering to comprehensively examine the interfacial mechanisms. Early oxidation stages enhance mineral reactivity through the formation of surface sulfur phases (e.g., S n (2-)/S(0)) with semiconductor properties, leading to oscillatory mineral reactivity. Subsequent steps entail the generation of intermediate siderite (FeCO3)-like, followed by the formation of low-compact mass sub-micro ferric oxyhydroxides (α, γ-FeOOH) with adsorbed arsenic (mainly As(III), and lower amounts of As(V)). In addition, weathering reactions can be influenced by accessible arsenic resulting in the formation of a symplesite (Fe3(AsO4)3)-like compound which is dependent on the amount of accessible arsenic in the system. It is proposed that arsenic release occurs via diffusion across secondary α, γ-FeOOH structures during arsenopyrite weathering. We suggest weathering mechanisms of arsenopyrite in calcareous soil and environmental implications based on experimental data.

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Section: Discussionmentioning

confidence: 99%

Section: Influence Of Accessible Arsenic In Arsenopyrite Weathering Rmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Arsenopyrite weathering under conditions of simulated calcareous soil

Lara¹,

Velázquez²,

Vazquez‐Arenas³

et al. 2015

Environ Sci Pollut Res

View full text Add to dashboard Cite

show abstract

“…The Ca 2þ ions released from carbonates (2% in bulk samples) react with SO 4 2À (from accessory pyrite) precipitating as gypsum. These processes are well-known from geological open systems such as the Quema area in Spain, Saitama prefecture in Japan and Dakota formation, Nebraska (Martín et al, 2007).…”

Section: Mineralogical Studymentioning

confidence: 99%