Sorption of Arsenic(V) and Arsenic(III) to schwertmannite

Edward D. Burton, Richard T. Bush, Scott G. Johnston, Kym M. Watling, Rosalie K. Hocking, Leigh A. Sullivan, Gretel K. Parker

Research output: Contribution to journalArticle

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Abstract

This study describes the sorption of As(V) and As(III) to schwertmannite as a function of pH and arsenic loading. In general, sorption of As(V) was greatest at low pH, whereas high pH favored the sorption of As(III). The actual pH of equivalent As(V) and As(III) sorption was strongly loading dependent, decreasing from pH ∼ 8.0 at loadings <120 mmolAs mol Fe -1 to pH ∼ 4.6 at a loading of 380 mmolAs molFe -1. Sorption isotherms for As(V) were characterized by strong partitioning to the schwertmannite solid-phase at low loadings and sorption capacities of 225-330 mmolAs(V) molFe -1 at high loadings. In contrast, the As(III) isotherms revealed a weak affinity for sorption of As(III) versus As(V) at low loadings yet a greater affinity for As(III) sorption compared with As(V) at high loadings (when pH > 4.6). Sorption of As(V) and As(III) caused significant release of SO 4 2- from within the schwertmannite solid-phase, without major degradation of the schwertmannite structure (as evident by X-ray diffraction and Raman spectroscopy). This can be interpreted as arsenic sorption via incorporation into the schwertmannite structure, rather than merely surface complexation at the mineral-water interface. The results of this study have important implications for arsenic mobility in the presence of schwertmannite, such as in areas affected by acidmine drainage and acid-sulfate soils. In particular, arsenic speciation, arsenic loading, and pH should be considered when predicting and managing arsenic mobility in schwertmanniterich systems.

Original languageEnglish
Pages (from-to)9202-9207
Number of pages6
JournalEnvironmental Science and Technology
Volume43
Issue number24
DOIs
Publication statusPublished - 2009
Externally publishedYes

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schwertmannite
Arsenic
Sorption
arsenic
sorption
Isotherms
isotherm
acid sulfate soil
Mineral Waters
Raman spectroscopy
Complexation
complexation
Sulfates
Drainage
partitioning
X-ray diffraction
drainage

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Burton, E. D., Bush, R. T., Johnston, S. G., Watling, K. M., Hocking, R. K., Sullivan, L. A., & Parker, G. K. (2009). Sorption of Arsenic(V) and Arsenic(III) to schwertmannite. Environmental Science and Technology, 43(24), 9202-9207. https://doi.org/10.1021/es902461x
Burton, Edward D. ; Bush, Richard T. ; Johnston, Scott G. ; Watling, Kym M. ; Hocking, Rosalie K. ; Sullivan, Leigh A. ; Parker, Gretel K. / Sorption of Arsenic(V) and Arsenic(III) to schwertmannite. In: Environmental Science and Technology. 2009 ; Vol. 43, No. 24. pp. 9202-9207.
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abstract = "This study describes the sorption of As(V) and As(III) to schwertmannite as a function of pH and arsenic loading. In general, sorption of As(V) was greatest at low pH, whereas high pH favored the sorption of As(III). The actual pH of equivalent As(V) and As(III) sorption was strongly loading dependent, decreasing from pH ∼ 8.0 at loadings <120 mmolAs mol Fe -1 to pH ∼ 4.6 at a loading of 380 mmolAs molFe -1. Sorption isotherms for As(V) were characterized by strong partitioning to the schwertmannite solid-phase at low loadings and sorption capacities of 225-330 mmolAs(V) molFe -1 at high loadings. In contrast, the As(III) isotherms revealed a weak affinity for sorption of As(III) versus As(V) at low loadings yet a greater affinity for As(III) sorption compared with As(V) at high loadings (when pH > 4.6). Sorption of As(V) and As(III) caused significant release of SO 4 2- from within the schwertmannite solid-phase, without major degradation of the schwertmannite structure (as evident by X-ray diffraction and Raman spectroscopy). This can be interpreted as arsenic sorption via incorporation into the schwertmannite structure, rather than merely surface complexation at the mineral-water interface. The results of this study have important implications for arsenic mobility in the presence of schwertmannite, such as in areas affected by acidmine drainage and acid-sulfate soils. In particular, arsenic speciation, arsenic loading, and pH should be considered when predicting and managing arsenic mobility in schwertmanniterich systems.",
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Burton, ED, Bush, RT, Johnston, SG, Watling, KM, Hocking, RK, Sullivan, LA & Parker, GK 2009, 'Sorption of Arsenic(V) and Arsenic(III) to schwertmannite', Environmental Science and Technology, vol. 43, no. 24, pp. 9202-9207. https://doi.org/10.1021/es902461x

Sorption of Arsenic(V) and Arsenic(III) to schwertmannite. / Burton, Edward D.; Bush, Richard T.; Johnston, Scott G.; Watling, Kym M.; Hocking, Rosalie K.; Sullivan, Leigh A.; Parker, Gretel K.

In: Environmental Science and Technology, Vol. 43, No. 24, 2009, p. 9202-9207.

Research output: Contribution to journalArticle

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T1 - Sorption of Arsenic(V) and Arsenic(III) to schwertmannite

AU - Burton, Edward D.

AU - Bush, Richard T.

AU - Johnston, Scott G.

AU - Watling, Kym M.

AU - Hocking, Rosalie K.

AU - Sullivan, Leigh A.

AU - Parker, Gretel K.

PY - 2009

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N2 - This study describes the sorption of As(V) and As(III) to schwertmannite as a function of pH and arsenic loading. In general, sorption of As(V) was greatest at low pH, whereas high pH favored the sorption of As(III). The actual pH of equivalent As(V) and As(III) sorption was strongly loading dependent, decreasing from pH ∼ 8.0 at loadings <120 mmolAs mol Fe -1 to pH ∼ 4.6 at a loading of 380 mmolAs molFe -1. Sorption isotherms for As(V) were characterized by strong partitioning to the schwertmannite solid-phase at low loadings and sorption capacities of 225-330 mmolAs(V) molFe -1 at high loadings. In contrast, the As(III) isotherms revealed a weak affinity for sorption of As(III) versus As(V) at low loadings yet a greater affinity for As(III) sorption compared with As(V) at high loadings (when pH > 4.6). Sorption of As(V) and As(III) caused significant release of SO 4 2- from within the schwertmannite solid-phase, without major degradation of the schwertmannite structure (as evident by X-ray diffraction and Raman spectroscopy). This can be interpreted as arsenic sorption via incorporation into the schwertmannite structure, rather than merely surface complexation at the mineral-water interface. The results of this study have important implications for arsenic mobility in the presence of schwertmannite, such as in areas affected by acidmine drainage and acid-sulfate soils. In particular, arsenic speciation, arsenic loading, and pH should be considered when predicting and managing arsenic mobility in schwertmanniterich systems.

AB - This study describes the sorption of As(V) and As(III) to schwertmannite as a function of pH and arsenic loading. In general, sorption of As(V) was greatest at low pH, whereas high pH favored the sorption of As(III). The actual pH of equivalent As(V) and As(III) sorption was strongly loading dependent, decreasing from pH ∼ 8.0 at loadings <120 mmolAs mol Fe -1 to pH ∼ 4.6 at a loading of 380 mmolAs molFe -1. Sorption isotherms for As(V) were characterized by strong partitioning to the schwertmannite solid-phase at low loadings and sorption capacities of 225-330 mmolAs(V) molFe -1 at high loadings. In contrast, the As(III) isotherms revealed a weak affinity for sorption of As(III) versus As(V) at low loadings yet a greater affinity for As(III) sorption compared with As(V) at high loadings (when pH > 4.6). Sorption of As(V) and As(III) caused significant release of SO 4 2- from within the schwertmannite solid-phase, without major degradation of the schwertmannite structure (as evident by X-ray diffraction and Raman spectroscopy). This can be interpreted as arsenic sorption via incorporation into the schwertmannite structure, rather than merely surface complexation at the mineral-water interface. The results of this study have important implications for arsenic mobility in the presence of schwertmannite, such as in areas affected by acidmine drainage and acid-sulfate soils. In particular, arsenic speciation, arsenic loading, and pH should be considered when predicting and managing arsenic mobility in schwertmanniterich systems.

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