Arsenic in the Soil Environment: A Review

Smith, Euan; Naidu, Ravi; Alston, A. M.

doi:10.1016/s0065-2113(08)60504-0

Cited by 559 publications

(373 citation statements)

References 122 publications

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“…The FEFF 7.02 program [31] was used to calculate theoretical phase and amplitude functions of As-O, As-O-O multiple scattering, As-Al, As-Cu As-Fe, and As-Zn scattering paths using input files based on the structural refinement of adamite (Zn 2 …”

Section: Exafs Data Analysismentioning

confidence: 99%

“…Goethite concentrations of 10 and 100 mg L −1 supported the formation of zincarsenate precipitates after 24 and 72 h, respectively, whereas in 1000 mg L −1 suspensions no precipitates formed. It should be noted that at pH 7 and 750 µM Cu(II), both Cu(OH) 2 and tenorite (CuO) were supersaturated, which would help to explain the noticeable complexation of As(V) with Cu(II) in gibbsite suspensions.…”

Section: Homogeneous and Heterogeneous Precipitatesmentioning

confidence: 99%

“…It supports an investigation into the influence of co-sorbing metals (Cr, Cu and Zn) on the solid phase speciation of arsenic (As) in a copper-chromated-arsenate (CCA) contaminated soil using in situ synchrotron-based, micro-focused X-ray absorption spectroscopy (μXAS). The detailed analyses presented in this paper were warranted for several reasons: (1) As(V)'s solid phase speciation in soils and sediments is greatly influenced by the presence and variety of sorbing surfaces (e.g., goethite vs gibbsite), pH, redox potential and presence of co-sorbing metals (e.g., Cu and Zn) and other ligands (e.g., PO 4 ) [2,20,26]. (2) The number and type of structural elements (e.g., edge-sharing vs corner-sharing complexes) comprising As(V)'s second shell (R + R 2.20 Å, uncorrected for phase shifts) and possible contributions from MS remain unclear for As(V) surface complexes on Fe and Al oxides [10,16,17,27].…”

Section: Introductionmentioning

confidence: 99%

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Arsenic speciation in multiple metal environments: I. Bulk-XAFS spectroscopy of model and mixed compounds

Gräfe

Tappero

Marcus

et al. 2008

Journal of Colloid and Interface Science

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X-ray absorption fine structure (XAFS) spectroscopy was employed to determine the bonding environment of As(V) in the presence of Cu(II) and Zn(II) on goethite and gibbsite. In addition, several mineral species and precipitates derived from homogeneous and heterogeneous (presence of α-Cr 2 O 3 ) super-saturations were studied. Structural parameters were determined after resolving the broad second shells in r-space by differential k-weighting (1, 2 or 3) and k-ranging (2.5-vs 3.5-12.75 Å) of the raw EXAFS functions. In precipitates, AsO 4 was incorporated in the metal-hydroxides forming clinoclase-like and koettigite-like structures in the presence of Cu(II) and Zn(II), respectively. In the presence of both Cu(II) and Zn(II), the clinoclase structure formed preferentially over the koettigite structure under homogeneous oversaturated solution conditions and in the presence of eskolaite (α-Cr 2 O 3 ). Silica promoted the formation of koettigite-like zinc-arsenate precipitates from initial As(V) and Zn(II) solution concentrations of 500 µM. On goethite and gibbsite, 750 µM As(V) formed mainly bidentate binuclear surface species in accordance with many previous findings even in the presence of equimolar Cu(II) and or Zn(II) concentrations. Copper was readily identified in the second shell environment of As(V) sorbed on gibbsite, but not on goethite. We hypothesize that this complex formed on the basis of Cu(II)'s ability to form polymeric species in solution and at the mineral-water interface in agreement with previous studies. The effects of Zn(II) on the coordination environment of As(V) on gibbsite and goethite could not be ascertained with As K-edge EXAFS spectroscopy. In addition to bidentate binuclear surface complexes, As(V) formed edge-sharing complexes with Fe, Al, and Cu atoms, which we could differentiate on the basis of the inter-atomic distances, phase shifts between wavefunctions of Fourier-filtered peaks, and differences in amplitude of the absorption envelopes. The analyses showed that of all data reduction steps, data presented in r-space and as wavefunctions of Fourier-filtered shells offer the greatest possibility for fingerprinting and inferring the influence of co-sorbing metal cations on the As(V) sorption complex. With regards to interpretations of micro-EXAFS data by abstract factor analyses and linear least-square combination fitting, analyses of As K-edge data should not be performed on the raw χ(k) data, but rather on consistently isolated second and higher-order shell features.

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Section: Exafs Data Analysismentioning

confidence: 99%

Section: Homogeneous and Heterogeneous Precipitatesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Arsenic speciation in multiple metal environments: I. Bulk-XAFS spectroscopy of model and mixed compounds

Gräfe

Tappero

Marcus

et al. 2008

Journal of Colloid and Interface Science

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“…Soils contaminated with arsenic are an immediate as well as a long-term hazard to the health of plants and animals, including humans (Smith, Naidu, & Alston, 1998). The sources of arsenic in soils are different; according to the rock type, Bhumble and Keefer (1994), point out that sedimentary rocks contain proportionally more arsenic (between 1.7 and 40 mg kg −1 ) than do igneous rocks (between 1.5 and 3 mg kg −1 ).…”

Section: Introductionmentioning

confidence: 99%

Arsenic Contamination in Soils Affected by a Pyrite-mine Spill (Aznalcóllar, SW Spain)

Aguilar

Dorronsoro

Ondoño

et al. 2006

Water Air Soil Pollut

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On 1998, a settling pond of a pyrite mine in Aznalcóllar (SW Spain) broke open, spilling some 3.6×10 6 m 3 of water and 0.9×10 6 m 3 of toxic tailings into the Agrio and Guadiamar river basin 40 km downstream, nearly to Doñana National Park. The soils throughout the basin were studied for arsenic pollution. Almost all the arsenic penetrated the soils in the solid phase (tailings) in variable amounts, mainly as a result of the different soil structure. The chemical oxidation of the tailings was the main cause of the pollution in these soils. A study of the relationships between the main soil characteristics and arsenic extracted with different reagents (water, CaCl 2 , acetic acid, oxalic-oxalate and EDTA) indicates a direct relationship with the total arsenic concentration. The highest amount of arsenic was extracted by oxalic-oxalate (24%-36% of the total arsenic), indicating the binding with the iron oxides.

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“…Elevated arsenic (As) concentrations in soils can originate from mining and smelting industries, wastewater irrigation, and application of As-containing pesticides, herbicides and fungicides (Smith et al, 1998;Adriano, 2001). In some cases arsenic contaminated soil can present a potential to pollute surface water and groundwater or to enter the food chain through plant uptake and, therefore, has adverse effects on environmental and human health (Liu et al, 2001;Nordstrom, 2002).…”

Section: Introductionmentioning

confidence: 99%

Effects of Oxalate and Humic Acid on Arsenate Sorption by and Desorption from a Chinese Red Soil

Luo

Zhang

Shan

et al. 2006

Water Air Soil Pollut

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Abstract. Studies on arsenate (As(V)) sorption and desorption have been mainly limited to soil minerals and sorption and desorption reactions in whole soils are poorly understood. In this study the sorption of As(V) by and phosphate-induced desorption from a Chinese red soil were studied in the presence of oxalate and humic acid (HA). Arsenate was strongly sorbed mainly through ligand exchange reactions on the soil. Arsenate sorption decreased in the presence of oxalate or HA. Oxalate and HA influenced As(V) sorption mainly by competing for sorption sites and reducing sorption sites, and oxalate could also decrease sorption through dissolving clay minerals. Oxalate and HA could also facilitate As(V) desorption from the soil. Both sorption and desorption kinetics were two stage processes. Sorption kinetics conducted from 0.2-840 h showed that As(V) sorption increased with increasing residence time. Sorption equilibrium was retarded and the maximum sorption decreased in the presence of oxalate or HA. Phosphate-induced desorption kinetics conducted on the soil with 24 h and 840 h of sorption equilibrium time showed a significant effect of equilibrium time on As(V) desorption. The presence of oxalate or HA during the sorption process resulted in more As(V) desorption. Due to the degradation of oxalate, soil treated with oxalate and with a sorption equilibrium time of 840 h showed no significant difference in desorption kinetics from untreated soil.

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Arsenic in the Soil Environment: A Review

Cited by 559 publications

References 122 publications

Arsenic speciation in multiple metal environments: I. Bulk-XAFS spectroscopy of model and mixed compounds

Arsenic speciation in multiple metal environments: I. Bulk-XAFS spectroscopy of model and mixed compounds

Arsenic Contamination in Soils Affected by a Pyrite-mine Spill (Aznalcóllar, SW Spain)

Effects of Oxalate and Humic Acid on Arsenate Sorption by and Desorption from a Chinese Red Soil

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