Differences in the immobilization of arsenite and arsenate by calcite

Yokoyama, Yuka; Tanaka, Kohei; Takahashi, Yoshio

doi:10.1016/j.gca.2012.05.022

Cited by 86 publications

(66 citation statements)

References 38 publications

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“…Alexandratos et al (2007), Sø et al (2008) and Yokoyama et al (2012) claimed that only As(V) can incorporate in calcite. Sø et al (2008) explained such an effect on the basis of the different chemical behavior of arsenate and arsenite oxyanions.…”

Section: Introductionmentioning

confidence: 99%

“…Sø et al (2008) explained such an effect on the basis of the different chemical behavior of arsenate and arsenite oxyanions. Arsenious acid, H 3 AsO 3 having high pK a values (pK a = 9.32, 12.10, 13.41; Yokoyama et al, 2012), exists predominantly as a neutral species in most natural aqueous conditions (i.e., from acidic to mildly basic solutions), and hence it is likely less reactive to the calcite surface. On the contrary, arsenic acid, H 3 AsO 4 , that is a stronger acid (Pk a = 2.…”

Section: Introductionmentioning

confidence: 99%

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Arsenic uptake in bacterial calcite

Catelani

Perito

Bellucci

et al. 2018

Geochimica et Cosmochimica Acta

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Bio-mediated processes for arsenic (As) uptake in calcite were investigated by means of X-ray Diffraction (XRD) and Xray Absorption Spectroscopy (XAS) coupled with X-ray Fluorescence measurements. The environmental bacterial strain Bacillus licheniformis BD5, sampled at the Bullicame Hot Springs (Viterbo, Central Italy), was used to synthesize calcite from As-enriched growth media. Both liquid and solid cultures were applied to simulate planktonic and biofilm community environments, respectively. Bacterial calcite samples cultured in liquid media had an As enrichment factor (Kd) 50 times higher than that from solid media. The XRD analysis revealed an elongation of the crystal lattice along the c axis (by 0.03 Å ) for biogenic calcite, which likely resulted from the substitution of larger arsenate for carbonate in the crystal. The XAS data also showed a clear difference in the oxidation state of sorbed As between bacterial and abiotic calcite. Abiotic chemical processes yielded predominantly As(V) uptake whereas bacterial precipitation processes led to the uptake of both As(III) and As(V). The presence of As(III) in bacterial calcite is proposed to result from subsequent reduction of arsenate to arsenite by bacterial activities. To the best of our knowledge, this is the first experimental observation of the incorporation of As(III) in the calcite crystal lattice, revealing a critical role of biochemical processes for the As cycling in nature.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Arsenic uptake in bacterial calcite

Catelani

Perito

Bellucci

et al. 2018

Geochimica et Cosmochimica Acta

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“…No obstante, este modelo muestra una tendencia negativa (Figura 3); es decir, la concentración de arsénico disminuye 0.4770 mg kg -1 cuando el porcentaje de CaCO 3 se incrementa una unidad. De acuerdo con Yokoyama et al (2012), el pH alcalino propicia la unión del metaloide a los CaCO 3 . Los pH de los suelos del área de estudio son de neutros a alcalinos, lo que ayuda a explicar el comportamiento del As respecto al CaCO 3 .…”

Section: Arsénico En Los Suelos Del Dr017 En La Comarca Laguneraunclassified

Arsénico edáfico y su distribución en el distrito de riego 017: uso de métodos de interpolación.

Garrido¹,

Castruita

Vidal

et al. 2017

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RESUMENLos constituyentes del suelo (arcillas, carbonatos, materia orgánica y óxidos e hidróxidos), intervienen en la movilidad del arsénico (As) y determinan su variación espacial; por lo cual, su cartografía puede contribuir al entendimiento de la presencia de este metaloide en el suelo. Los objetivos de esta investigación fueron determinar la concentración de As en los suelos del Distrito de Riego 017 (DR017) de México y establecer su distribución espacial, utilizando dos métodos de interpolación. Cuatro etapas fueron realizadas; la primera consistió en trabajo de gabinete y campo, en la que 33 sitios de muestreo fueron localizados en un polígono del DR017, posteriormente en cada sitio, muestras simples de suelo (0-30 cm de profundidad) fueron colectadas. La segunda y tercera se llevaron a cabo en laboratorio, en las cuales, a cada muestra se determinó la concentración de As disponible, contenidos de arcilla, carbonatos de calcio y fósforo disponible y su regresión. La cuarta etapa tuvo dos partes, la elaboración de dos mapas con dos métodos de interpolación (Interpolador Ponderación Inversa de la Distancia, IDW en sus siglas en inglés y Kriging ordinario, KO), así como la verif icación de la precisión de cada mapa. Los resultados mostraron que, la distribución del As en el DR017 no es uniforme y está asociada con el contenido de arcilla y CaCO 3 . De tal manera que, las concentraciones de As fluctuaron de 0.07 a 1.89 mg kg -1 , donde las mayores concentraciones de este metaloide (1.39-1.89 mg kg -1 ) se relacionaron positivamente (R 2 = 0.9058) con altos contenidos de arcilla (39.44 a 43.44%). El mapa de distribución espacial de As obtenido con KO, tuvo la mayor precisión (75.7%), en el cual se muestra que la concentración aumenta en un sentido sur-norte, donde el área de mayor concentración está en la parte norte del distrito. Palabras clave: arsenatos, kriging, IDW, geoestadístico. SUMMARYSoil constituents (clays, carbonates, organic matter and oxides and hydroxides), involved in the mobility of arsenic (As), determine its spatial variation; thus, the mapping can contribute to the understanding of the presence of this metalloid on the soil. The objectives of this research were to determine the concentration of As in soils of Irrigation District 017 (DR017) of Mexico and establish its spatial distribution using two interpolation methods. Four stages were performed; the f irst consisted of desk work and f ield, in which 33 sampling sites were located in a polygon of DR017, then at each site, simple soil samples (0-30 cm depth) were collected. The second and third were carried out in laboratory, in which, in each sample the concentration of As available, clay content, carbonates of calcium and phosphorus available and their regression were determined. The fourth stage had two parts, the development of two maps with two interpolation methods (Interpolator Weighting Inverse Distance, IDW its acronym in English and ordinary Kriging, OK) and verif ication of the accuracy of each map. The results showed that the d...

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“…The adsorption study conducted by Yang et al (2010) found Cd and As are both adsorbed by natural muscovite, with Cd adsorption increasing at pH 8.7 or higher, and maximum As adsorption at pH 5.6, with As(V) adsorbed more readily than As(III) (adsorption capacity of 0.791 and 0.330 mg g −1 , respectively). Studies by Di Benedetto et al (2006) and Yokoyama et al (2012) found negatively charged arsenate can also adsorb to calcite due to the positive surface charge of carbonates at low pH, but arsenite is neutral below pH 9.3 and therefore not adsorbed onto carbonates.…”

Section: As and CD Release And Fatementioning

confidence: 99%

“…Arsenic is a redox sensitive contaminant and commonly occurs in the soil aqueous phase as As 3+ (usually in the form of arsenite) and As 5+ (usually in the form of arsenate). Arsenite and arsenate have different sorption properties; arsenite adsorbs strongly only on Fe oxides whereas arsenate adsorbs on almost all adsorbents present in soils (So et al, 2008;Yokoyama et al, 2012;Martin et al, 2014).…”

Section: Possible Mechanisms That Control As Fatementioning

confidence: 99%

Evaluating impacts of CO2 and CH4 gas intrusion into an unconsolidated aquifer: fate of As and Cd

Lawter

Qafoku

Shao

et al. 2015

Front. Environ. Sci.

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The sequestration of carbon dioxide (CO 2 ) in deep underground reservoirs has been identified as an important strategy to decrease atmospheric CO 2 levels and mitigate global warming, but potential risks on overlying aquifers currently lack a complete evaluation. In addition to CO 2 , other gasses such as methane (CH 4 ) may be present in storage reservoirs. This paper explores for the first time the combined effect of leaking CO 2 and CH 4 gasses on the fate of major, minor and trace elements in an aquifer overlying a potential sequestration site. Emphasis is placed on the fate of arsenic (As) and cadmium (Cd) released from the sediments or present as soluble constituents in the leaking brine. Results from macroscopic batch and column experiments show that the presence of CH 4 (at a concentration of 1% in the mixture CO 2 /CH 4 ) does not have a significant effect on solution pH or the concentrations of most major elements (such as Ca, Ba, and Mg). However, the concentrations of Mn, Mo, Si and Na are inconsistently affected by the presence of CH 4 (i.e., in at least one sediment tested in this study). Cd is not released from the sediments and spiked Cd is mostly removed from the aqueous phase most likely via adsorption. The fate of sediment associated As [mainly sorbed arsenite or As(III) in minerals] and spiked As [i.e., As 5+ ] is complex. Possible mechanisms that control the As behavior in this system are discussed in this paper. Results are significant for CO 2 sequestration risk evaluation and site selection and demonstrate the importance of evaluating reservoir brine and gas stream composition during site selection to ensure the safest site is being chosen.

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Differences in the immobilization of arsenite and arsenate by calcite

Cited by 86 publications

References 38 publications

Arsenic uptake in bacterial calcite

Arsenic uptake in bacterial calcite

Arsénico edáfico y su distribución en el distrito de riego 017: uso de métodos de interpolación.

Evaluating impacts of CO2 and CH4 gas intrusion into an unconsolidated aquifer: fate of As and Cd

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