Oxidation of arsenopyrite by air and air-saturated, distilled water, and implications for mechanism of oxidation

Nesbitt, H.W.; Muir, I.J.; Prarr, A.R.

doi:10.1016/0016-7037(95)00081-a

Cited by 303 publications

(191 citation statements)

References 20 publications

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“…Arsenic XANES data show that As in As-bearing sulfides (arsenopyrite plus orpiment-like material) makes up more than 30% of the As in the aquifer and aquitard-aquifer contact sediments from cores OTT3 and TG3, and approximately 50% of the As in core UMRB2. Oxidative dissolution of As sulfides has been identified as a source of As to groundwater in mine wastes (Nesbitt et al, 1995;Yu et al, 2007) and in bedrock aquifers that contain sulfide minerals (Schreiber et al, 2000;West et al, 2012). It appears that arsenopyrite is also a possible solid-phase source of As in glacial aquifers.…”

Section: Proposed Mechanisms Of Arsenic Release To Glacial Aquifersmentioning

confidence: 99%

Solid-phase arsenic speciation in aquifer sediments: A micro-X-ray absorption spectroscopy approach for quantifying trace-level speciation

Nicholas

Erickson

Woodruff

et al. 2017

Geochimica et Cosmochimica Acta

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Arsenic (As) is a geogenic contaminant affecting groundwater in geologically diverse systems globally. Arsenic release from aquifer sediments to groundwater is favored when biogeochemical conditions, especially oxidation-reduction (redox) potential, in aquifers fluctuate. The specific objective of this research is to identify the solid-phase sources and geochemical mechanisms of release of As in aquifers of the Des Moines Lobe glacial advance. The overarching concept is that conditions present at the aquifer-aquitard interfaces promote a suite of geochemical reactions leading to mineral alteration and release of As to groundwater. A microprobe X-ray absorption spectroscopy (lXAS) approach is developed and applied to rotosonic drill core samples to identify the solid-phase speciation of As in aquifer, aquitard, and aquifer-aquitard interface sediments. This approach addresses the low solid-phase As concentrations, as well as the fine-scale physical and chemical heterogeneity of the sediments. The spectroscopy data are analyzed using novel cosine-distance and correlation-distance hierarchical clustering for Fe 1s and As 1s lXAS datasets. The solid-phase Fe and As speciation is then interpreted using sediment and well-water chemical data to propose solid-phase As reservoirs and release mechanisms. The results confirm that in two of the three locations studied, the glacial sediment forming the aquitard is the source of As to the aquifer sediments. The results are consistent with three different As release mechanisms: (1) desorption from Fe (oxyhydr)oxides, (2) reductive dissolution of Fe (oxyhydr) oxides, and (3) oxidative dissolution of Fe sulfides. The findings confirm that glacial sediments at the interface between aquifer and aquitard are geochemically active zones for As. The diversity of As release mechanisms is consistent with the geographic heterogeneity observed in the distribution of elevated-As wells.

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Section: Proposed Mechanisms Of Arsenic Release To Glacial Aquifersmentioning

confidence: 99%

Solid-phase arsenic speciation in aquifer sediments: A micro-X-ray absorption spectroscopy approach for quantifying trace-level speciation

Nicholas

Erickson

Woodruff

et al. 2017

Geochimica et Cosmochimica Acta

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“…Se puede encontrar en una variedad de sistemas tales como depósitos magmáticos, hidrotermales y pórfidos. Es por esto que la arsenopirita es comúnmente asociada con la aparición de oro, lo que genera su amplia explotación y posterior descarga como desechos sólidos en los procesos mineros (Corkhill and Vaughan, 2009 (Nesbitt et al 1995).…”

Section: Mecanismos De Oxidación Bacteriana Para La Arsenopiritaunclassified

“…Ellos sugirieron, debido a las altas concentraciones de Fe(II) en comparación con Fe(III), la presencia de wustita (Fe 1-x O) y magnetita (Fe 2 O 3 ). Nesbitt et al (1995) caracterizaron la superficie de una arsenopirita luego de oxidada durante 25 horas en aire. Las especies químicas observadas incluyen la presencia de O 2 , grupos hidroxilos y agua superficial.…”

Section: Mecanismos De Oxidación Bacteriana Para La Arsenopiritaunclassified

Aplicaciones biotecnológicas en minería aurífera: Estado del arte sobre la oxidación bacteriana de arsenopirita (FeAsS)

et al. 2011

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ResumenEn el mundo, grandes cantidades de sulfuros provenientes de la explotación minera con características refractarias y/o con iones, en su estructura cristalina, nocivos al medio ambiente y a la salud humana, han sido acumulados en el tiempo. Dichos sulfuros presentan contenidos de oro relevantes en la mayoría de los casos, el tratamiento de estos materiales no es factible por métodos convencionales, lo cual incrementa el costo de la recuperación de los valores metálicos presentes. Es así como, en las últimas décadas, la bio-hidrometalurgia, se ha convertido en una tecnología comercialmente viable para la extracción de metales preciosos. Además, es bien conocida por su utilización en la bio-remediación de drenajes ácidos, remoción de metales pesados presentes en áreas mineras, suelos y sedimentos contaminados, residuos industriales como cenizas de incineración; degradación de cianuro, adecuación de concentrados para separación por flotación espumante, biodesulfurización de carbones, entre otras. En este trabajo se presenta el principio fundamental de la oxidación bacteriana de la arsenopirita, así como un esbozo acerca de los mecanismos y diferentes susceptibilidades que muestra frente a la oxidación biológica.Palabras clave: Biominería, biooxidación, biolixiviación, arsénico, Acidithiobacillus ferrooxidans. AbstractThroughout the world, great quantities of sulfides from mining practices have accumulated over time.These have refractory characteristics y/or ions, in their crystalline structure, which are harmful to the environment y to human health. Said sulfides present relevant gold contents in most instances; treatment of these materials is not feasible through conventional methods, increasing the cost of recovery of the metallic values present. This is how in recent decades bio-hydrometallurgy has become a commercially viable technology for the extraction of precious metals. Additionally, it is well known for its use in the bio-remediation of acid drainage, removal of heavy metals present in mining areas, contaminated soils y sediments, industrial residues like incineration ash; cyanide degradation, adaptation of concentrates for foam separation, coal biodesulfurization, among others. This work presents the fundamental principle of bacterial oxidation of arsenopyrite, as well as an outline about the Aplicaciones biotecnológicas en minería aurífera: Estado del arte sobre la oxidación bacteriana de arsenopirita (FeAsS)

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“…This is a concern since the potential for metal(loid) ions to be released and remobilized poses an environmental health risk. During pyrite formation and diagenesis, trace metals such as arsenic (As) and selenium (Se) have been shown to isomorphically replace sulfide in the pyrite lattice [11,12]. The subsequent oxidation of this material can serve as a potential source of both Se and As in aqueous systems [2,13].…”

Section: Introductionmentioning

confidence: 99%

Investigating the Effects of Se Solid Phase Substitution in Jarosite Minerals Influenced by Bacterial Reductive Dissolution

2014

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Jarosite minerals (AB 3 (TO 4 ) 2 (OH) 6 ) are iron hydroxysulfate minerals that can readily incorporate trace metals into their mineral structure. A range of metals can be incorporated into the jarosite structure, including oxyanions such as selenate (SeO 4 2− ). Selenium is a micronutrient, but is toxic in relatively low doses. Selenium is present in aqueous systems in its two oxyanion forms: selenate and selenite (SeO 3 2− ). The tetrahedral sulfate coordination site can be completely substituted for selenate in jarosite minerals (NaFe 3 (SO 4 ) x (SeO 4 ) 2-x (OH) 6 ). Bacteria have been observed to reduce Se oxyanions to both more reduced forms and insoluble elemental Se. This is a pathway for selenium immobilization at contaminated sites. This experiment investigates the reductive dissolution of two Se-jarosites (solid substitution containing high and low selenium concentrations) in the presence of Shewanella putrefaciens CN32. It was observed that both Fe(III) and selenate were metabolically reduced and released into solution through jarosite dissolution . Selenate was also found to be incorporated intracellularly and reduced to particulate Se which was released upon cell lysis. Compared to the abiotic samples, enhanced dissolution was found with both the live and dead bacteria treatments.

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Oxidation of arsenopyrite by air and air-saturated, distilled water, and implications for mechanism of oxidation

Cited by 303 publications

References 20 publications

Solid-phase arsenic speciation in aquifer sediments: A micro-X-ray absorption spectroscopy approach for quantifying trace-level speciation

Solid-phase arsenic speciation in aquifer sediments: A micro-X-ray absorption spectroscopy approach for quantifying trace-level speciation

Aplicaciones biotecnológicas en minería aurífera: Estado del arte sobre la oxidación bacteriana de arsenopirita (FeAsS)

Investigating the Effects of Se Solid Phase Substitution in Jarosite Minerals Influenced by Bacterial Reductive Dissolution

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