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oxyanions

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Journal Article

Competitive adsorption geometries for the arsenate As(V) and phosphate P(V) oxyanions on magnetite surfaces: Experiments and theory

Xiaoliang Liang, Xiaoju Lin, Gaoling Wei, Lingya Ma, Hongping He, David Santos-Carballal, Jianxi Zhu, Runliang Zhu, Nora H. De Leeuw
Published: 01 March 2021
American Mineralogist (2021) 106 (3): 374–388.
DOI: https://doi.org/10.2138/am-2020-7350
... at alkaline pH. Arsenate mainly formed bidentate binuclear (BB) complexes with some outer-sphere species, both of which were more prevalent at acid pH. The pre-absorbed inner-sphere arsenate species were scarcely affected by the introduction of phosphate. However, the pre-absorbed phosphate oxyanions...
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View PDF for article title, Competitive adsorption geometries for the arsenate As(V) and phosphate P(V) <span class="search-highlight">oxyanions</span> on magnetite surfaces: Experiments and theory
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Journal Article

Byzantievite, Ba 5 (Ca, REE ,Y) 22 (Ti,Nb) 18 (SiO 4 ) 4 [(PO 4 ),(SiO 4 )] 4 (BO 3 ) 9 O 21 [(OH),F] 43 (H 2 O) 1.5 : the crystal structure and crystal chemistry of the only known mineral with the oxyanions (BO 3 ), (SiO 4 ) and (PO 4 )

E. Sokolova, F. C. Hawthorne, L. A. Pautov, A. A. Agakhanov
Published: 01 April 2010
Mineralogical Magazine (2010) 74 (2): 285–308.
DOI: https://doi.org/10.1180/minmag.2010.074.2.285
... is the only known mineral that contains all three of the oxyanions (BO 3 ), (SiO 4 ) and (PO 4 ) as essential components. * E-mail: [email protected] 29 4 2010 23 3 2010 T able 1. Chemical composition (wt.%) and unit formula (a.p.f.u.) for byzantievite. Oxide...
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View PDF for article title, Byzantievite, Ba 5 (Ca, REE ,Y) 22 (Ti,Nb) 18 (SiO 4 ) 4 [(PO 4 ),(SiO 4 )] 4 (BO 3 ) 9 O 21 [(OH),F] 43 (H 2 O) 1.5 : the crystal structure and crystal chemistry of the only known mineral with the <span class="search-highlight">oxyanions</span> (BO 3 ), (SiO 4 ) and (PO 4 )
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Journal Article

EFFECTS OF OXYANIONS ON THE EDTA-PROMOTED DISSOLUTION OF GOETHITE

Jillian L. Campbell, Matthew J. Eick
Published: 01 June 2002
Clays and Clay Minerals (2002) 50 (3): 336–341.
...Jillian L. Campbell; Matthew J. Eick Abstract Organic ligands, such as EDTA, accelerate the dissolution of silicate and oxide minerals. In natural systems, oxyanions can compete with organic ligands for mineral surface sites thereby affecting ligand-promoted dissolution rates, either enhancing...
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View PDF for article title, EFFECTS OF <span class="search-highlight">OXYANIONS</span> ON THE EDTA-PROMOTED DISSOLUTION OF GOETHITE
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Journal Article

"Face-to-face" relationships between oxocentred tetrahedra and cation-centred tetrahedral oxyanions in crystal structures of minerals and inorganic compounds

S. V. Krivovichev, G. L. Starova, S. K. Filatov
Published: 01 April 1999
Mineralogical Magazine (1999) 63 (2): 263–266.
...S. V. Krivovichev; G. L. Starova; S. K. Filatov Abstract Detailed analysis of the crystal structures of minerals and inorganic compounds containing oxocentred [OCu 4 ] tetrahedra reveals the following principle for relationships between oxocentred tetrahedra and tetrahedral oxyanions (Tn+O4) (super...
View PDF for article title, &quot;Face-to-face&quot; relationships between oxocentred tetrahedra and cation-centred tetrahedral <span class="search-highlight">oxyanions</span> in crystal structures of minerals and inorganic compounds
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Journal Article

Calculation of bond distances, one-electron energies and electron density distributions in first-row tetrahedral hydroxy and oxyanions

Abha Gupta, Donald K. Swanson, John A. Tossell, G. V. Gibbs
Published: 01 June 1981
American Mineralogist (1981) 66 (5-6): 601–609.
...Abha Gupta; Donald K. Swanson; John A. Tossell; G. V. Gibbs Abstract The tetrahedral hydroxyanions T ( OH ) 4 n and oxyanions of the first row elements from Li to N are studied using the ab initio SCF MO method. Equilibrium T–O distances calculated using small orbital basis sets are within 0.05Å...
View PDF for article title, Calculation of bond distances, one-electron energies and electron density distributions in first-row tetrahedral hydroxy and <span class="search-highlight">oxyanions</span>
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Journal Article

Molecular orbital calculations on beryllium and boron oxyanions: Interpretation of X-ray emission, ESCA, and NQR spectra and of the geochemistry of beryllium and boron

David J. Vaughan, John A. Tossell
Published: 01 August 1973
American Mineralogist (1973) 58 (7-8): 765–770.
View PDF for article title, Molecular orbital calculations on beryllium and boron <span class="search-highlight">oxyanions</span>: Interpretation of X-ray emission, ESCA, and NQR spectra and of the geochemistry of beryllium and boron
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Journal Article

The Effects of Oxyanion Adsorption on Reactive Oxygen Species Generation by Titanium Dioxide

Mary R. Arenberg, Yuji Arai
Published: 01 October 2019
Clays and Clay Minerals (2019) 67 (5): 410–418.
DOI: https://doi.org/10.1007/s42860-019-00039-8
... oxyanions in soil porewaters, including nitrate and phosphate). While the TiO 2 photocatalytic reactions have been studied extensively in basic research, how environmentally relevant conditions (e.g. ligand interaction) affect its photoreactivity is not well understood. Researchers previously reported...
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View PDF for article title, The Effects of <span class="search-highlight">Oxyanion</span> Adsorption on Reactive Oxygen Species Generation by Titanium Dioxide
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Uptake of aqueous selenite oxyanions (solid symbols) and aqueous selenate oxyanions (hollow symbols) on goethite particle surfaces as a function of pH and ionic strength. The sorption of selenite oxyanions is not affected by increasing ionic strength (1 to 1000 mM NaNO3), which is generally indicative of inner-sphere sorption complexes. However, selenate sorption is affected significantly by increasing ionic strength, which shifts the isotherms to lower pH. This behavior is generally indicative of outer-sphere sorption complexes (after Hayes et al. 1987).

Uptake of aqueous selenite oxyanions (solid symbols) and aqueous selenate o...

Published: 01 July 2022
Figure 21. Uptake of aqueous selenite oxyanions (solid symbols) and aqueous selenate oxyanions (hollow symbols) on goethite particle surfaces as a function of pH and ionic strength. The sorption of selenite oxyanions is not affected by increasing ionic strength (1 to 1000 mM NaNO 3 ), which
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ALUMINOFLUORIDE MINERALS WITH ADDITIONAL OXYANIONS

Published: 11 May 2021
TABLE 9. ALUMINOFLUORIDE MINERALS WITH ADDITIONAL OXYANIONS
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Possible complexes formed by tetrahedral oxyanions.

Possible complexes formed by tetrahedral oxyanions.

Published: 01 January 2009
Figure 13. Possible complexes formed by tetrahedral oxyanions.
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Relationship between pH and the speciation for the adsorbate oxyanions Cr(VI) and As(V).

Relationship between pH and the speciation for the adsorbate oxyanions Cr(V...

Published: 01 October 2008
Figure 3. Relationship between pH and the speciation for the adsorbate oxyanions Cr(VI) and As(V).
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Sulfur K-edge XANES spectra for some S oxyanions, arranged to emphasize the local nature of photoelectron transitions associated with the absorption of X-rays. 1 marks the edge peak for thio S, and 4 the edge peak for S–O bonds of sulfate; note that Na thiosulfate (F) is a pentahydrate, and Mg thiosulfate (E) a hexahydrate.

Sulfur K -edge XANES spectra for some S oxyanions, arranged to emphasize t...

Published: 01 December 2005
F ig . 14. Sulfur K -edge XANES spectra for some S oxyanions, arranged to emphasize the local nature of photoelectron transitions associated with the absorption of X-rays. 1 marks the edge peak for thio S, and 4 the edge peak for S–O bonds of sulfate; note that Na thiosulfate (F
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LEWIS BASICITIES ( vu ) FOR SOME MINERALOGICALLY IMPORTANT OXYANIONS

Published: 01 October 2001
TABLE 2. LEWIS BASICITIES ( vu ) FOR SOME MINERALOGICALLY IMPORTANT OXYANIONS
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Binding of (a) metal ions and (b) oxyanions to ferrihydrite as a function of pH (modified from Dzombak and Morel 1990).

Binding of (a) metal ions and (b) oxyanions to ferrihydrite as a function o...

Published: 01 January 2000
Figure 21. Binding of (a) metal ions and (b) oxyanions to ferrihydrite as a function of pH (modified from Dzombak and Morel 1990 ).
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a) Ficklin plot of divalent cations vs. pH for a range of mineral deposits. b) Oxyanion plot of metal oxyanions vs. pH for a range of mineral deposits. Mine water samples from various mineral deposits from unpublished data (from the authors). SEDEX = sedimentary exhalative.

a) Ficklin plot of divalent cations vs. pH for a range of mineral deposits....

Published: 01 October 2023
Fig. 5. a) Ficklin plot of divalent cations vs. pH for a range of mineral deposits. b) Oxyanion plot of metal oxyanions vs. pH for a range of mineral deposits. Mine water samples from various mineral deposits from unpublished data (from the authors). SEDEX = sedimentary exhalative.
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Comparison of the dissolution rates in the presence of EDTA and EDTA with the oxyanions at 1.0 and 0.10 mM. α-FeOOH suspension density = 2.5 g L−1, [EDTA] = 1.0 mM, [oxyanions] = 1.0 mM or 0.10 mM, ionic strength = 0.01 M NaNO3.

Comparison of the dissolution rates in the presence of EDTA and EDTA with t...

Published: 01 June 2002
Figure 4. Comparison of the dissolution rates in the presence of EDTA and EDTA with the oxyanions at 1.0 and 0.10 mM. α-FeOOH suspension density = 2.5 g L −1 , [EDTA] = 1.0 mM, [oxyanions] = 1.0 mM or 0.10 mM, ionic strength = 0.01 M NaNO 3 .
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Average spectra (offset) for groups of uranyl minerals based on oxyanion chemistry. The number of mineral species included in the average are indicated. (Color online.)

Average spectra (offset) for groups of uranyl minerals based on oxyanion ch...

Published: 01 December 2023
Figure 2. Average spectra (offset) for groups of uranyl minerals based on oxyanion chemistry. The number of mineral species included in the average are indicated. (Color online.)
Journal Article

THE CRYSTAL CHEMISTRY OF THE “NICKELALUMITE”-GROUP MINERALS

Yulia A. Uvarova, Elena Sokolova, Frank C. Hawthorne, Vladimir V. Karpenko, Atali A. Agakhanov, Leonid A. Pautov
Published: 01 October 2005
The Canadian Mineralogist (2005) 43 (5): 1511–1519.
DOI: https://doi.org/10.2113/gscanmin.43.5.1511
... [□ M 2+ M 3+ 4 (OH) 12 ] 2+ that are intercalated with interstitial complexes of oxyanions and (H 2 O) groups. The Lewis acidity of the structural unit is 0.167 vu , and the character of the interstitial complexes is constrained by the valencesum rule of bond-valence theory. Possible interstitial...
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View PDF for article title, THE CRYSTAL CHEMISTRY OF THE “NICKELALUMITE”-GROUP MINERALS
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Journal Article

The crystal structure of shigaite, [AlMn (super 2+) 2 (OH) 6 ] 3 (SO 4 ) 2 Na(H 2 O) 6 {H 2 O} 6 , hydrotalcite-group mineral

Mark A. Cooper, Frank C. Hawthorne
Published: 01 February 1996
The Canadian Mineralogist (1996) 34 (1): 91–97.
... reflections measured with MoKalpha X-radiation. The structural unit of shigaite is a planar sheet of edge-sharing octahedra, [AlMn (super 2+) 2 (OH) 6 ] (super 1+) . These oxycation sheets are intercalated with oxyanion sheets of chemical composition Na(H 2 O) 6 {H 2 O} 6 (SO 4 ) 2 ; hydrogen bonding plays...
View PDF for article title, The crystal structure of shigaite, [AlMn (super 2+) 2 (OH) 6 ] 3 (SO 4 ) 2 Na(H 2 O) 6 {H 2 O} 6 , hydrotalcite-group mineral
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Isotope fractionation model. Shown are the isotopic compositions of reduced inorganic selenium species (SeRed) and residual oxyanions (SeOx) as a function of the fraction that is subject to reduction. Calculations were done with standard equations for open-system behavior (e.g. Canfield 2001; Stüeken et al. 2015d). (a) ɛ = 3.09‰, (b) ɛ = 0.89‰, (c) ɛ = 0.52‰. Fractionation factors were chosen such that 13% (a), 45% (b) or 77% (c) reduction push residual oxyanions up to +0.4‰. Resulting reduced phases have compositions of −2.68‰ (a), −0.49‰ (b), and −0.12‰ (c). Black dashed lines are for reference.

Isotope fractionation model. Shown are the isotopic compositions of reduced...

Published: 01 January 2017
Figure 5 Isotope fractionation model. Shown are the isotopic compositions of reduced inorganic selenium species (SeRed) and residual oxyanions (SeO x ) as a function of the fraction that is subject to reduction. Calculations were done with standard equations for open-system behavior (e.g