A qualitative and quantitative investigation of partitioning and local structure of arsenate in barite lattice during coprecipitation of barium, sulfate, and arsenate

Ma, Xu; Yuan, Zidan; Goméz, Mario A.; Wang, Xin; Wang, Shaofeng; Yao, Shanshan; Jia, Yongfeng

doi:10.2138/am-2017-6148

Cited by 14 publications

(11 citation statements)

References 48 publications

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“…Supporting our interpretation, Ma et al . 50 show through analysis of X-ray diffraction data that the incorporation of As(V) into the barite structure during co-precipitation expands the unit cell volume, which can subsequently decrease the density.…”

Section: Resultsmentioning

confidence: 99%

“…As described in the Methods section, it was not possible to quantify in absolute terms of the moles of each element, but it is possible to quantify the relevant ratios, and because both Sr and Ba are strongly detected at the HXN beamline, the ratio in equation 1 is directly quantified from the relevant X-ray fluorescence intensities. For Arsenic, HAsO 4 2− ions substitute for SO 4 2− in barite 49 , 50 . Therefore, the fractional substitution of the anion HAsO 4 2− for SO 4 2− is represented as: …”

Section: Resultsmentioning

confidence: 99%

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Nanospectroscopy Captures Nanoscale Compositional Zonation in Barite Solid Solutions

Ling

Hunter

Fitts

et al. 2018

Sci Rep

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Scientists have long suspected that compositionally zoned particles can form under far-from equilibrium precipitation conditions, but their inferences have been based on bulk solid and solution measurements. We are the first to directly observe nanoscale trace element compositional zonation in <10 µm-sized particles using X-ray fluorescence nanospectroscopy at the Hard X-ray Nanoprobe (HXN) Beamline at National Synchrotron Light Source II (NSLS-II). Through high-resolution images, compositional zonation was observed in barite (BaSO4) particles precipitated from aqueous solution, in which Sr2+ cations as well as HAsO42− anions were co-precipitated into (Ba,Sr)SO4 or Ba(SO4,HAsO4) solid solutions. Under high salinity conditions (NaCl ≥ 1.0 M), bands contained ~3.5 to ~5 times more trace element compared to the center of the particle formed in early stages of particle growth. Quantitative analysis of Sr and As fractional substitution allowed us to determine that different crystallographic growth directions incorporated trace elements to different extents. These findings provide supporting evidence that barite solid solutions have great potential for trace element incorporation; this has significant implications for environmental and engineered systems that remove hazardous substances from water.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Nanospectroscopy Captures Nanoscale Compositional Zonation in Barite Solid Solutions

Ling

Hunter

Fitts

et al. 2018

Sci Rep

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“…The released AsO 3 3− and/or AsO 4 3− ions will rapidly complex with H + ions and then exist in the form of H 3 As III O 3 0 , H 2 As V O 4 − , and H 3 As V O 4 , thus having less similarity to SO 4 2− during the dissolution−neutralization process in acidic solutions (Figure S3) and hence preventing As from taking place of an isomorphic substitution with SO 4 2− at an acidic pH (∼2). 3,42 2.2.2. Liquid-Phase Analysis.…”

Section: Resultsmentioning

confidence: 99%

“…The results suggested that almost all of the trace metal cations remained in the postreaction solution. A previous study indicated that stable and wellcrystallized scorodite was synthesized in the presence of 43 g/L Zn and 37 g/L Cu, 42 thus suggesting that the liberated Zn and Cu ions from the As(V)-enriched solution likely did not play a significant role in scorodite formation. In our work, an As removal efficiency of 96.5% was achieved via the formation of scorodite in the presence of trace metal impurities (Pd, Zn, Cd, and Cu).…”

Section: Oxidation Of As(iii) To As(v)mentioning

confidence: 97%

Alternative Method for the Treatment of Hydrometallurgical Arsenic–Calcium Residues: The Immobilization of Arsenic as Scorodite

Yuan

Zhang

et al. 2020

ACS Omega

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Arsenic−calcium residue (ACR) is one of the major hazardous solid wastes produced by the metallurgical industry that poses a serious threat to the environment. However, a suitable method for the effective treatment of ACR is still lacking. In this study, an alternative treatment method for ACRs via the immobilization of As as scorodite was proposed with the use of two types of ACRs (ACR real directly collected from a Pb refinery and ACR lab precipitated from waste sulfuric acid in the lab). The treatment of ACR included preparing the As-enriched solution via H 2 SO 4 dissolution−neutralization of ACR at pH < 2, As(III) was oxidized by H 2 O 2 , and As(V) was immobilized as scorodite. The results showed that gypsum produced from ACR lab in the dissolution− neutralization process contained 68 mg/kg of As, far below the Chinese national standard for hazardous solid wastes (<0.1 wt %, GB5085.62007). The gypsum produced from ACR real contained 5400 mg/kg of As due to the presence of original high-As gypsum (1.6 wt %) in ACR real . These results showed that the preliminary removal of SO 4 2− from waste sulfuric acid by lime neutralization− precipitation at pH ∼ 2 could produce pure-phase gypsum by avoiding the HAsO 4 2− isomorphic substitution for SO 4 2− . The scorodite produced from both ACRs displayed good As stability at pH 4.95 (0.9 and 0.5 mg/L) via the toxicity characteristic leaching procedure (TCLP) method and at pH 3−7 (0.4−3.0 mg/L) via a 15 day short-term stability test.

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“…Due to the similar geometry and charge between HAsO4 2and SO4 2-, HAsO4 2can be incorporated into SO4-bearing minerals via the isomorphic substitution for SO4 2and forming solid solutions. For example, As(V)-barite (Ba(SO4)x(HAsO4)1-x), As(V)-gypsum (Ca(SO4)x(HAsO4)1-x•2H2O) and basic ferric arsenate sulfate solid solutions (Fe(AsO4)0.2-0.7(SO4)0.7-0.2(OH)0.7-0.2) have been reported (Fernández-Martínez et al 2008;Gomez et al 2010;Bolanz et al 2016;Ma et al 2017). Analogously, coexisting SO4 2can also be incorporated into the scorodite host phase and form a SO4-scorodite solid solution (Fujita et al 2009b).…”

Section: Introductionmentioning

confidence: 97%

Spectroscopic study on the local structure of sulfate (SO42−) incorporated in scorodite (FeAsO4·2H2O) lattice: Implications for understanding the Fe(III)-As(V)-SO42−-bearing minerals formation

Goméz

et al. 2022

American Mineralogist

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A qualitative and quantitative investigation of partitioning and local structure of arsenate in barite lattice during coprecipitation of barium, sulfate, and arsenate

Cited by 14 publications

References 48 publications

Nanospectroscopy Captures Nanoscale Compositional Zonation in Barite Solid Solutions

Nanospectroscopy Captures Nanoscale Compositional Zonation in Barite Solid Solutions

Alternative Method for the Treatment of Hydrometallurgical Arsenic–Calcium Residues: The Immobilization of Arsenic as Scorodite

Spectroscopic study on the local structure of sulfate (SO42−) incorporated in scorodite (FeAsO4·2H2O) lattice: Implications for understanding the Fe(III)-As(V)-SO42−-bearing minerals formation

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