Arsenic species as an indicator of redox conditions in groundwater

Cherry, J.A.; Shaikh, Ali U.; Tallman, Dennis E.; Nicholson, Ronald V.

doi:10.1016/0022-1694(79)90182-3

Cited by 256 publications

(79 citation statements)

References 10 publications

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“…Superimposed predominance diagrams for the Fe±S± K±CO 2 ±H 2 ±O 2 system (after Nordstrom and Munoz (1994)), and for the As±H 2 ±O 2 system as a function of pH and pE at 258C, 1 bar. Arsenic speciation (solid phases not shown) from thermodynamic data in Bowell (1994), Cherry et al (1979), Pokrovsky et al (1996) and Hem (1977 minerals and predominance ®elds for aqueous Fe species in the system Fe±S±K±CO 2 ±H 2 ±O 2 ; predominance ®elds for aqueous As species are superimposed on the Fe diagram. Both ferrihydrite, a precursor to goethite (Schwertmann and Fischer, 1973;Schwertmann et al, 1985), and jarosite are common weathering products of pyrite.…”

Section: Arsenic Distribution In Secondary Phasesmentioning

confidence: 99%

“…9A), As partitioning between solid and aqueous phases is aected by strati®cation and turnover (e.g., Aggett and O'Brien, 1985;Seyler and Martin, 1989;Belzile and Tessier, 1990;De Vitre et al, 1991;Kuhn and Sigg, 1993), and by variations in pH and redox potential (Cherry et al, 1979;Thanabalasingam and Pickering, 1986). During the winter mixis, monomictic Don Pedro Reservoir is well mixed and oxygenated, with a pH near neutral (Point M in Fig.…”

Section: Predictions For Arsenic Mobility At Don Pedro Reservoirmentioning

confidence: 99%

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Arsenic speciation in pyrite and secondary weathering phases, Mother Lode Gold District, Tuolumne County, California

Savage

Tingle

O’Day

et al. 2000

Applied Geochemistry

381

126

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Arsenian pyrite, formed during Cretaceous gold mineralization, is the primary source of As along the Melones fault zone in the southern Mother Lode Gold District of California. Mine tailings and associated weathering products from partially submerged inactive gold mines at Don Pedro Reservoir, on the Tuolumne River, contain H20±1300 ppm As. The highest concentrations are in weathering crusts from the Clio mine and nearby outcrops which contain goethite or jarosite. As is concentrated up to 2150 ppm in the ®ne-grained (<63 mm) fraction of these Fe-rich weathering products.Individual pyrite grains in albite-chlorite schists of the Clio mine tailings contain an average of 1.2 wt.% As. Pyrite grains are coarsely zoned, with local As concentrations ranging from H0 to 5 wt.%. Electron microprobe, transmission electron microscope, and extended X-ray absorption ®ne-structure spectroscopy (EXAFS) analyses indicate that As substitutes for S in pyrite and is not present as inclusions of arsenopyrite or other As-bearing phases. Comparison with simulated EXAFS spectra demonstrates that As atoms are locally clustered in the pyrite lattice and that the unit cell of arsenian pyrite is expanded by H2.6% relative to pure pyrite. During weathering, clustered substitution of As into pyrite may be responsible for accelerating oxidation, hydrolysis, and dissolution of arsenian pyrite relative to pure pyrite in weathered tailings. Arsenic K-edge EXAFS analysis of the ®ne-grained Ferich weathering products are consistent with corner-sharing between As(V) tetrahedra and Fe(III)-octahedra. Determinations of nearest-neighbor distances and atomic identities, generated from least-squares ®tting algorithms to spectral data, indicate that arsenate tetrahedra are sorbed on goethite mineral surfaces but substitute for SO 4 in jarosite. Erosional transport of As-bearing goethite and jarosite to Don Pedro Reservoir increases the potential for As mobility and bioavailability by desorption or dissolution. Both the substrate minerals and dissolved As species are expected to respond to seasonal changes in lake chemistry caused by thermal strati®cation and turnover within the monomictic Don Pedro Reservoir. Arsenic is predicted to be most bioavailable and toxic in the reservoir's summer hypolimnion. 7

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Section: Arsenic Distribution In Secondary Phasesmentioning

confidence: 99%

Section: Predictions For Arsenic Mobility At Don Pedro Reservoirmentioning

confidence: 99%

Arsenic speciation in pyrite and secondary weathering phases, Mother Lode Gold District, Tuolumne County, California

Savage

Tingle

O’Day

et al. 2000

Applied Geochemistry

381

126

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“…In case of sufficient alkalinity, the formed Fe(II) can be further oxidized to Fe(III) by dissolved oxygen and other chemical oxidants, and Fe(III) (hydro)oxides can also be used for arsenic removal [10,11]. Sulfide acts as a reductant to convert As(V) to As(III) [12] and to form soluble and insoluble arsenic-sulfide complexes, e.g., di-and tri-thioarsenite monomers, dimeric and trimeric arsenic-sulfur complexes [13,14]. The precipitation of As 2 S 3 (am) occurs, and the dominant dissolved As species is dependent on sulfide levels, pH, and temperature [15].…”

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confidence: 99%

Treatment of strongly acidic wastewater with high arsenic concentrations by ferrous sulfide (FeS): Inhibitive effects of S(0)-enriched surfaces

Liu

Yang

et al. 2016

Chemical Engineering Journal

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h i g h l i g h t sFeS shows higher removal efficiency towards As(III) than As(V). In acidic solution FeS dissolve to S(-II) for As(V) reduction and As 2 S 3 formation. S(-II) react with As(V) to form S(0)-rich surface on FeS and inhibit As removal. S(II)-rich surface inhibit FeS dissolution and arsenic removal. As(V) reduction to As(III) by dosing Na 2 S prior to FeS improve As(V) removal. The utilization of arsenopyrite (FeAsS), the As ore mineral, produces strongly acidic wastewater with extremely high arsenic (As) concentrations. This study investigates the feasibility of using ferrous sulfide (FeS) as a sulfide [S(-II)] source to treat strongly acidic wastewater with high concentrations of arsenite [As(III)] and arsenate [As(V)]. The removal of As(III) by FeS was nearly 30% higher than that of As(V), and higher acidity and elevated FeS doses benefited their removal. At extremely high acidity of above 7 mol/L as H 2 SO 4 , the consumption of S(-II) by H 2 SO 4 inhibited As removal. At lower acidity of below 2 mol/L as H 2 SO 4 , elevated FeS doses up to 4 times the theoretical dose could achieve good As removal. SEM/EDS and XPS analysis indicated the formation of As 2 S 3 precipitates, and sulfur [S(0)] also formed in the As(V)-removing system. The tiny and negatively-charged S(0) particles tend to coat the FeS surface. The S(0)-enriched surface acts as a barrier to inhibit S(-II) detachment and As(V) penetration and inhibits As(V) removal thereafter. The reduction of As(V) to As(III) by Na 2 S, prior to dosing with FeS, is preferred to achieve rapid and favorable As(V) removal. The low-cost FeS provides available Fe(II) and S(-II) for As removal, and is practically valuable to treat acidic high-As wastewater.

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“…Abiotic reactions are comparatively slow and may take months or years to reach equilibrium (Cherry et al, 1979). As(III)-oxidizing bacteria are widely distributed in the environment.…”

Section: Discussionmentioning

confidence: 99%

Arsenic redox transformation by Pseudomonas sp. HN-2 isolated from arsenic-contaminated soil in Hunan, China

Zhang

Yin

Cai

et al. 2016

Journal of Environmental Sciences

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A mesophilic, Gram-negative, arsenite[As(III)]-oxidizing and arsenate[As(V)]-reducing bacterial strain, Pseudomonas sp. HN-2, was isolated from an As-contaminated soil. Phylogenetic analysis based on 16S rRNA gene sequencing indicated that the strain was closely related to Pseudomonas stutzeri. Under aerobic conditions, this strain oxidized 92.0% (61.4 μmol/L) of arsenite to arsenate within 3 hr of incubation. Reduction of As(V) to As(III) occurred in anoxic conditions. Pseudomonas sp. HN-2 is among the first soil bacteria shown to be capable of both aerobic As(III) oxidation and anoxic As(V) reduction. The strain, as an efficient As(III) oxidizer and As(V) reducer in Pseudomonas, has the potential to impact arsenic mobility in both anoxic and aerobic environments, and has potential application in As remediation processes.

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Arsenic species as an indicator of redox conditions in groundwater

Cited by 256 publications

References 10 publications

Arsenic speciation in pyrite and secondary weathering phases, Mother Lode Gold District, Tuolumne County, California

Arsenic speciation in pyrite and secondary weathering phases, Mother Lode Gold District, Tuolumne County, California

Treatment of strongly acidic wastewater with high arsenic concentrations by ferrous sulfide (FeS): Inhibitive effects of S(0)-enriched surfaces

Arsenic redox transformation by Pseudomonas sp. HN-2 isolated from arsenic-contaminated soil in Hunan, China

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