Mobility and chemical fate of antimony and arsenic in historic mining environments of the Kantishna Hills district, Denali National Park and Preserve, Alaska

Ritchie, V.; Ilgen, Anastasia Gennadyevna; Mueller, Seth; Trainor, Thomas P.; Goldfarb, Richard J.

doi:10.1016/j.chemgeo.2012.10.016

Cited by 127 publications

(52 citation statements)

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“…It has been reported that 95% Sb(V) sorption by a non-crystalline Fe hydroxide across a pH range of 2.5-7 with a sorption maximum at about pH 4 (Tighe and Lockwood, 2007). Extended X-ray absorption fine structure (EXAFS) results concluded that Sb(V) formed monodentate-mononuclear and bidentate-binuclear inner-sphere surface complexes on Al and Fe oxides (Scheinost et al, 2006;Mitsunobu et al, 2010;Ilgen and Trainor, 2012;Ritchie et al, 2013;Guo et al, 2014). Surface complexation models (SCMs) have been used to simulate the adsorption of Sb(V) onto a wide range of adsorbents and are successful in predicting the effects of solution pH and ionic strength (Vithanage et al, 2013;Essington, 2013;Rakshit et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Kinetic modeling of pH-dependent antimony (V) sorption and transport in iron oxide-coated sand

Cai

Zhang

2015

Chemosphere

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h i g h l i g h t sDecreased Sb(V) sorption capacity and kinetic rate under alkaline condition. Inner-sphere surface complexation of Sb(V) on iron oxide coated sand. Increased mobility of Sb(V) caused by deprotonation on oxide surface. Nonlinear MRM model well describes time-dependent retention and transport. a r t i c l e i n f o (Sb) is prerequisite for evaluating the risk of groundwater contamination by the toxic element. In this study, kinetic batch and saturated miscible displacement experiments were performed to investigate effects of protonation-deprotonation reactions on sorption-desorption and transport of Sb(V) in iron oxidecoated sand (IOCS). Results clearly demonstrated that Sb(V) sorption was highly nonlinear and time dependent, where both sorption capacity and kinetic rates decreased with increasing solution pH. Breakthrough curves (BTCs) obtained at different solution pH exhibited that mobility of Sb(V) were higher under neutral to alkaline condition than under acidic condition. Because of the nonlinear and non-equilibrium nature of Sb(V) retention and transport, multi-reaction models (MRM) with equilibrium and kinetic sorption expressions were utilized successfully to simulate the experiment data. Equilibrium distribution coefficient (K e ) and reversible kinetic retention parameters (k 1 and k 2 ) of both kinetic sorption and transport experiment showed marked decrease as pH increased from 4.0 to 7.5. Surface complexation is suggested as the dominant mechanism for the observed pH-dependent phenomena, which need to be incorporated into the kinetic models to accurately simulate the reactive transport of Sb(V) in vadose zone and aquifers.

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Section: Introductionmentioning

confidence: 99%

Kinetic modeling of pH-dependent antimony (V) sorption and transport in iron oxide-coated sand

Cai

Zhang

2015

Chemosphere

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“…Several studies have reported the rapid oxidation of Sb(III) to Sb(V) in oxic systems and in the presence of Fe(III) and Mn(IV) oxyhydroxides (Belzile et al, 2001;Leuz et al, 2006;Thanabalasingam and Pickering, 1990;Watkins et al, 2006;Xu et al, 2011). Indeed, in oxic soils and sediments, Sb is almost exclusively found in the Sb(V) oxidation state (Mitsunobu et al, 2006;Ritchie et al, 2013;Scheinost et al, 2006;Takaoka et al, 2005).…”

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confidence: 99%

Adsorption of Antimonate by Gibbsite: Reversibility and the Competitive Effects of Phosphate and Sulfate

Essington

Stewart

2016

Soil Science Soc of Amer J

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Antimony (sb) is a potential environmental contaminant of emerging concern that occurs in soils in the sb(V) oxidation state as the antimonate species sb(OH) 6 -. In soils, metal oxyhydroxides play an important role in the immobilization of contaminants and in restricting bioaccessibility. One such mineral is gibbsite, which bears the reactive aluminol surface functional group. Both inner-and outer-sphere surface complexation mechanisms have been inferred from conflicting sb(V) adsorption findings involving aluminol-bearing minerals. The objectives of this research are to characterize sb(V) adsorption by gibbsite and to use the macroscopic findings to develop mechanistic adsorption models. Antimonate adsorption envelopes were developed using two equilibrium techniques: continuous pH titration and batch. The adsorption of sb(V) decreases with increasing pH and increasing ionic strength, suggesting that outer-sphere surface complexation is an important adsorption mechanism. However, sb(V) retention is irreversible at pH <6 but is reversible in pH >7 systems, suggesting that inner-sphere species may be significant in acidic environments. Adsorbed sb(V) also generates a downward shift in the gibbsite isoelectric point, further supporting the formation of inner-sphere sb(V) surface complexes. Both PO 4 and sO 4 decrease adsorbed sb(V) concentrations: PO 4 throughout the pH 3 to 10 range and sO 4 in pH <7 systems. The triple-layer surface complexation model successfully predicts sb(V) adsorption by using both outer-sphere and inner-sphere surface species. The triple-layer model also predicts ligand adsorption in the competitive systems without the need for reoptimization.Abbreviations: BET, Brunauer-Emmett-Teller; ICP-AES, inductively coupled argon plasma-atomic emission spectroscopy; IEP, isoelectric point; SCM, surface complexation model; TLM, triple layer model; XRD, x-ray diffraction.A ntimony is one of the least abundant elements in soils, having a median concentration in uncontaminated soils from around the world of 1 mg kg −1 (range, <0.2-10 mg kg −1 ) (Bowen, 1979;Filella et al., 2002;Helmke, 2000). However, anthropogenic activities can result in elevated soil Sb levels (Crecelius et al., 1975;Filella et al., 2002;Li and Thornton, 1993;Nriagu, 1989;Nriagu and Pacyna, 1988;Scheinost et al., 2006). Soils that are particularly affected by Sb are those at military and civilian shooting ranges. Antimony is a hardening agent in lead bullets, which contain ~5% Sb (Carlin, 2000;Johnson et al., 2005;Kilgour et al., 2008). As bullets and bullet fragments corrode, Pb and Sb are released to the soil environment (Clausen and Korte, 2009;Kilgour et al., 2008). The resulting Sb concentrations can far exceed native soil levels. Antimony concentrations in military and civilian shooting range soils have been reported to range from <517 to <17,500 mg kg −1 (Basunia and Landsberger, 2001;Johnson et al., 2005;Kilgour et al., 2008;Knechtenhofer et al., 2003;Mitsunobu et al., 2006;Okkenhaug et al., 2013;Spuller et al., 2007), alth...

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“…These phases are major components of As in most oxidized environmental media. Arsenic adsorbed to metal-oxide surfaces have been commonly identified via As XAS in both soil [23][24][25][26] and solid waste [27][28][29]. In addition, As(V) was identified in all of the study materials ranging from 10-100%, although some (6) soils and solid wastes did contain As(III) ranging between 7-90%.…”

Section: Arsenic Speciationmentioning

confidence: 99%

“…Samples with ferric arsenates and lower RBA As (9, 10, 12-17, 29, 30, 24, 27) are most likely to be a more insoluble forms of ferric arsenate. Samples with ferric arsenate and higher RBA As (12,(14)(15)(16)(17)29) are more likely to be soluble phases. In addition, the mineral solubilities of scorodite and yukonite were compared and show that the bioaccessible As for yukonite is much higher than that for scorodite [31].…”

Section: Arsenic Speciation and Bioavailabilitymentioning

confidence: 99%

“…Principal component two included ferric arsenates and As(V) coprecipitated with jarosite with coefficients of 0.725 and −0.558, respectively. There were two major groupings within the data set which comprised of soils and solid wastes that As speciation was dominated by As(V) adsorbed species (3, 16, 18, 19, 20, 21, 33 and 38), soils and solid wastes that As speciation was dominated by ferric arsenates (9,10,12,13,14,15,17,29,30,34,37 …”

Section: Species Groupings Via Principle Component Analysismentioning

confidence: 99%

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Arsenic Speciation of Contaminated Soils/Solid Wastes and Relative Oral Bioavailability in Swine and Mice

et al. 2018

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Arsenic (As) is one of the most widespread, toxic elements in the environment, and human activities have resulted in a large number of contaminated areas. However abundant, the potential of As toxicity from exposure to contaminated soils is limited to the fraction that will dissolve in the gastrointestinal system and be absorbed into systemic circulation or bioavailable species. In part, the release of As from contaminated soil to gastrointestinal fluid depends on the form of solid phase As, also termed "As speciation". In this study, 27 As-contaminated soils and solid wastes were analyzed using X-ray absorption spectroscopy (XAS) and results were compared to in vivo bioavailability values determined using the adult mouse and juvenile swine bioassays. Arsenic bioavailability was lowest for soils that contained large amounts of arsenopyrite and highest for materials that contained large amounts of ferric arsenates. Soil and solid waste type and properties rather than the contamination source had the greatest influence on As speciation. Principal component analysis determined that As(V) adsorbed and ferric arsenates were the dominant species that control As speciation in the selected materials. Multiple linear regression (MLR) was used to determine the ability of As speciation to predict bioavailability. Arsenic speciation was predictive of 27% and 16% of Relative Bioavailable (RBA) As determined using the juvenile swine and adult mouse models, respectively. Arsenic speciation can provide a conservative estimate of RBA As using MLR for the juvenile swine and adult mouse bioassays at 55% and 53%, respectively.

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Mobility and chemical fate of antimony and arsenic in historic mining environments of the Kantishna Hills district, Denali National Park and Preserve, Alaska

Cited by 127 publications

References 54 publications

Kinetic modeling of pH-dependent antimony (V) sorption and transport in iron oxide-coated sand

Kinetic modeling of pH-dependent antimony (V) sorption and transport in iron oxide-coated sand

Adsorption of Antimonate by Gibbsite: Reversibility and the Competitive Effects of Phosphate and Sulfate

Arsenic Speciation of Contaminated Soils/Solid Wastes and Relative Oral Bioavailability in Swine and Mice

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