Adsorption Sequence of Toxic Inorganic Anions on a Soil

Saeki, Kazutoshi

doi:10.1007/s00128-008-9505-7

Cited by 8 publications

(3 citation statements)

References 33 publications

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“…The sum of chromate released in the two desorption processes reached over 50% in both soils (Table 2). This desorption is in accordance with the higher affinity of phosphate for iron oxides and soil surfaces compared with chromate [41,85].…”

Section: Discussionsupporting

confidence: 81%

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Sorption and Desorption of Vanadate, Arsenate and Chromate by Two Volcanic Soils of Equatorial Africa

González-Rodríguez

Fernández-Marcos

2021

Soil Systems

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Sorption of oxyanions by soils and mineral surfaces is of interest due to their role as nutrients or pollutants. Volcanic soils are variable charge soils, rich in active forms of aluminum and iron, and capable of sorbing anions. Sorption and desorption of vanadate, arsenate, and chromate by two African andosols was studied in laboratory experiments. Sorption isotherms were determined by equilibrating at 293 K soil samples with oxyanion solutions of concentrations between 0 and 100 mg L−1 V, As, or Cr, equivalent to 0−2.0 mmol V L−1, 0−1.3 mmol As L−1, and 0−1.9 mmol Cr L−1, in NaNO3; V, As, or Cr were determined by ICP-mass spectrometry in the equilibrium solution. After sorption, the soil samples were equilibrated with 0.02 M NaNO3 to study desorption. The isotherms were adjusted to mathematical models. After desorption with NaNO3, desorption experiments were carried out with a 1 mM phosphate. The sorption of vanadate and arsenate was greater than 90% of the amount added, while the chromate sorption was much lower (19–97%). The sorption by the Silandic Andosol is attributed to non-crystalline Fe and Al, while in the Vitric Andosol, crystalline iron species play a relevant role. The V and Cr sorption isotherms fitted to the Freundlich model, while the As sorption isotherms conformed to the Temkin model. For the highest concentrations of oxyanions in the equilibrating solution, the sorbed concentrations were 37–38 mmol V kg−1, 25 mmol As kg−1, and 7.2–8.8 mmol Cr kg−1. The desorption was low for V and As and high for Cr. The comparison of the sorption and desorption isotherms reveals a pronounced hysteresis for V in both andosols and for Cr in the Silandic Andosol. Phosphate induced almost no V desorption, moderate As desorption, and considerable Cr desorption.

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Section: Discussionsupporting

confidence: 81%

“…According to Jiang et al [40], both specific adsorption and electrostatic adsorption contribute to chromate adsorption by variable-charge soils (Ferralsols, Acrisol). Saeki [85] reported that chromate is adsorbed by a Silandic Andosol forming outer-sphere complex.…”

Section: Discussionmentioning

confidence: 99%

Sorption and Desorption of Vanadate, Arsenate and Chromate by Two Volcanic Soils of Equatorial Africa

González-Rodríguez

Fernández-Marcos

2021

Soil Systems

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“…This process may drive the release of adsorbed As(V) in groundwater since As(III) has a lower sorption capacity than As(V) on Fe(III) hydroxides at circumneutral pH values. Production of sulfide may also induce sulfide-driven arsenic mobilization from arsenopyrite and black shale pyrite Cumming et al 1999;Langner and Inskeep 2000;Oremland and Stolz 2003;Zhu et al 2008 Natural organic matter (NOM) may induce arsenic release by competing for adsorption sites, forming aqueous complexes, changing the redox potential of surface adsorption sites Wang and Mulligan 2006 Anion exchange with competitive ions such as phosphate, carbonate and possibly some anionic organic compounds Meng et al 2002;William et al 2003;Saeki 2008;Zhang et al 2005;Tao et al 2006 pH increase in semiarid or arid environments to values [8.5 as a result of the combined effects of mineral weathering and high evaporation rates leads to desorption of adsorbed As [mainly As(V)] and other anions (V, B, F, Mo, Se and U) from mineral oxides; need for irrigation in semiarid regions may also drive As mobilization Smedley and Kinniburgh 2002;Nickson et al 2005;Madhavan and Subramanian 2007;Busbee et al 2009 As mobilization by the formation of arsenocarbonate complexes, suggested by strong correlation between As and HCO 3 -; the latter correlation may also be an indirect result of the microbial mediated reduction of Fe(III) hydroxides, which produces both the As and HCO 3 -species Kim et al2000;Anawar et al 2004;Radu et al 2005 Groundwater age and aging of Fe oxides leading to more ordered forms such as goethite and hematite that have larger crystal sizes and reduced surface areas may lead to a release of As adsorbed on young Fe oxides Cornell and Schwertmann 1996;Dixit and Hering 2003;Pedersen et al 2006;Radloff et al 2007 Lake in Northern Latium, Central Italy. The samples were weathered on the surface and they were brushed and polished before using them in the leaching tests to minimize the effect of external deposits.…”

Section: As Mobilization Triggers In Aquifers Referencementioning

confidence: 99%

Release of Arsenic from Volcanic Rocks through Interactions with Inorganic Anions and Organic Ligands

2010

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The effects of a number of inorganic anions (F -, HCO 3 -, B(OH) 4 -, Cl -, I -) and of the siderophore DFO-B on the release of As from volcanic rocks were investigated in batch experiments. While previously reported field and laboratory data support a role of inorganic anions on As mobilization into aquifers, the role of siderophores on As-induced mobilization was less investigated. Fluoride, bicarbonate and DFO-B have shown a significant influence on the release of As from the rocks. Lava was mostly affected among the investigated rocks at pH 6 and 20°C by releasing 4% of its initial As content in the presence of 0.01 M F -and 10% in the presence of 500 lM DFO-B. The effect of fluoride was larger at pH 6 than at pH 8.5 for all the rocks. In the case of DFO-B, there was also a larger effect at pH 6 compared to pH 8 for the various rocks except tuff. Bicarbonate played a role under alkaline conditions while its effect was negligible at pH 6. Anion exchange processes in the presence of fluoride and bicarbonate and complexation processes in the presence of the siderophore DFO-B appear to be the major processes responsible for the release of arsenic from the rocks. The siderophore DFO-B plays mainly an indirect role on the As release by complexing Al, Fe and Mn, thus favoring the dissolution of the rocks and the consequent release of As bound to surface Al, Fe and Mn oxy-hydroxides. These findings suggest that ionic interactions with fluoride, bicarbonate and siderophore may be a further triggering factor in the mobilization of As from aquifer rocks.

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Tailoring dual-functional gold nanoplasmonic rods for colorimetric and SERS detection of mercury species in complex matrices

Tao

Chen²,

Fodjo³

et al. 2023

Chemical Engineering Journal

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Adsorption Sequence of Toxic Inorganic Anions on a Soil

Cited by 8 publications

References 33 publications

Sorption and Desorption of Vanadate, Arsenate and Chromate by Two Volcanic Soils of Equatorial Africa

Sorption and Desorption of Vanadate, Arsenate and Chromate by Two Volcanic Soils of Equatorial Africa

Release of Arsenic from Volcanic Rocks through Interactions with Inorganic Anions and Organic Ligands

Tailoring dual-functional gold nanoplasmonic rods for colorimetric and SERS detection of mercury species in complex matrices

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