Selenite Adsorption on Alluvial Soils: II. Solution Composition Effects

Neal, Rosemary H.; Sposito, Garrison; Holtzclaw, Kenneth M.; Traina, Samuel J.

doi:10.2136/sssaj1987.03615995005100050013x

Cited by 91 publications

(38 citation statements)

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“…3 it is clear that there exists a considerable percentage of adsorption above the value of pH pzc , i.e., the pH at which the adsorbent surface is negatively charged. This indicates that the adsorption is not only due to the electrostatic force of attraction between the adsorbent surface and SeO 2− 3 ion but also due to a combined effect of both chemical, i.e., ligand exchange type (26), and electrostatic interaction. Further, in order to prove an ion exchange mechanism, the XRD of one selenite exchanged sample was taken, and a shift in the peak position (003 line) toward lower 2θ values compared to the parent hydrotalcite was observed.…”

Section: Ph-dependent Adsorptionmentioning

confidence: 99%

Studies on Mg/Fe Hydrotalcite-Like-Compound (HTlc)

Das

Dash

et al. 2002

Journal of Colloid and Interface Science

101

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Section: Ph-dependent Adsorptionmentioning

confidence: 99%

Studies on Mg/Fe Hydrotalcite-Like-Compound (HTlc)

Das

Dash

et al. 2002

Journal of Colloid and Interface Science

101

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“…Fe and Mn oxides) (BALISTRIERI and CHAO, 1990;HAYES et al, 1989). Earlier investigations suggested that Se(IV) behaves like phosphate, forming strong inner-sphere sorption complexes (BARROW and WHELAN, 1989;NEAL et al, 1987a;NEAL et al, 1987b;ZHANG and SPARKS, 1990) and substituting for phosphate in apatite (DUC et al, 2003;MONTEIL-RIVERA et al, 2000).…”

Section: Speciation Of Selenium In Reductive Environmentsmentioning

confidence: 99%

Electron transfer at the mineral/water interface: Selenium reduction by ferrous iron sorbed on clay

Charlet

Scheinost²,

Tournassat

et al. 2007

Geochimica et Cosmochimica Acta

183

129

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Electron transfer at the mineral/water interface: Selenium reduction by ferrous iron sorbed on clay. Geochimica et Cosmochimica Acta, Elsevier, 2007, 71 (23) , selenite was sorbed as outer-sphere sorption complex, covering only part of the positive edge sites, as verified by a structure-based MUSIC model and Se K-edge XAS (X-ray absorption spectroscopy). When selenite was added to montmorillonite previously equilibrated with Fe 2+ solution however, slow reduction of Se and formation of a solid phase was observed with Se K-edge XANES (x-ray absorption near-edge spectroscopy) and EXAFS (extended x-ray absorption finestructure) spectroscopy. Iterative transformation factor analysis of XANES and EXAFS spectra suggested that only one Se reaction product formed, which was identified as nano-particulate Se(0). Even after one month, only 75% of the initially sorbed Se(IV) was reduced to this solid species. Mössbauer spectrometry revealed that before and after addition and reduction of Se, 5% of total sorbed Fe occurred as

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“…Dissolution and leaching of soil salts by irrigation water is a primary source of selenium to shallow groundwater in the western San Joaquin Valley. The following references present a very detailed geochemical understanding of selenium that is transferable to most environments: Fio and Fujii (1990), Fio et al (1991), Neal et al (1987aNeal et al ( , 1987b, Neal and Sposito (1989), Sposito et al (1988), Sposito et al (1991), andWright (1999). Within these references sorption studies showed that selenate is not adsorbed to the alluvial fan soils, whereas selenite is rapidly adsorbed.…”

Section: 26mentioning

confidence: 99%

Kd Values for Agricultural and Surface Soils for Use in Hanford Site Farm, Residential, and River Shoreline Scenarios

Serne¹

2007

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SummaryThis report provides best estimate K d values and a minimum and maximum range of K d values to be used for agricultural soils and Columbia River bank sediments that exist today or would exist in the future when portions of the Hanford Site are released for farming, residential, and recreational use after the U.S. Department of Energy (DOE) completes clean up of defense waste on the site. The K d values should be used to determine the fate and transport rates of contaminants and their availability for plant and animal uptake in selected non-groundwater scenarios included in Hanford Site environmental impact statements, risk assessments and specific facility performance assessments.This report describes scenarios such as a small farm where drilling of a well inadvertently goes through buried waste and brings waste to the surface, allowing the tailings to become available for direct human exposure or incorporation into garden crops and farm animals used for food by the farm family. The K d values recommended in this report can also be used to calculate sediment-water partitioning factors used to predict plant and animal uptake from interaction with the contaminated soil.The values recommended herein should not be used to predict exposure to contaminants in drinking water or from water used for irrigation. For the waterborne scenarios, K d values recommended in Last et al. (2004) and Krupka et al. (2004) should be used because they better predict the distribution and mobility of contaminants in water.Other non-groundwater scenarios include (1) recreational or native American use of the Columbia River bank that exposes humans to contaminants adsorbed to the river bank sediments, (2) contaminants transferred from sediments to plants or animals that reside along the Columbia River bank, and (3) any other scenario that requires estimation of soil-to-plant or soil-to-animal transfer parameters that are often calculated based on soil K d values.For these non-groundwater exposure scenarios, choosing a larger K d value from available values will be "conservative" in the sense that large K d values keep the contaminant available longer (retains more contaminants in the soils) such that exposure to humans or incorporation into animals and plants is maximized. Therefore, the K d values in this report are slightly biased to keep the contaminants near the ground surface for longer time periods. Upon exposure to water or by direct contact, the contaminated near-surface soils allow more opportunity for direct exposure and incorporation into plant matter and animals.The following contaminants of concern were the focus of the search: americium,

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Selenite Adsorption on Alluvial Soils: II. Solution Composition Effects

Cited by 91 publications

References 0 publications

Studies on Mg/Fe Hydrotalcite-Like-Compound (HTlc)

Studies on Mg/Fe Hydrotalcite-Like-Compound (HTlc)

Electron transfer at the mineral/water interface: Selenium reduction by ferrous iron sorbed on clay

Kd Values for Agricultural and Surface Soils for Use in Hanford Site Farm, Residential, and River Shoreline Scenarios

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