Adsorption and Desorption of Selenite and Selenate Selenium on Different Soils

Singh, Mahendra; Singh, Narendra; Relan, P. S.

doi:10.1097/00010694-198108000-00002

Cited by 87 publications

(49 citation statements)

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“…lb). Such a mechanism was also observed in other soil systems by Singh et al (1981). The Langmuir equation used to describe the adsorption behavior in mine spoils was: Recognition of selenate as lhe potential solution specie was again supported by a sequential extraction study, which indicated a strong correlation between the aqueous Se phase and corresponding selenate concentration (Fig.…”

Section: Resultssupporting

confidence: 59%

Understanding Selenium Mobility by Sorption and Extraction Processes in Surface Coal Mine Spoils

Sharmasarkar¹,

Vance²,

Reddy³

et al. 1995

ASMR

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Surface coal mine spoil was studied to evaluate selenium (Se) mobility and solubility using batch experiments, column-leaching techniques, and sequential and individual extraction processes. Both selenite and selenate followed linear isotherm patterns at relatively lower Se treatments, whereas over a broader solution Se concentration range the sorption mechanism followed the Langmuir model. The variation in the isotherm patterns with change in Se concentrations suggested that mechanisms for selenite-selenate sorption would be a function of the concentration of solution-phase Se. Greater isotherm slope for selenite sorption suggested higher affinity of this specie for the mine spoil, while selenate was the more labile aqueous specie. In the exchangeable phase, selenite was the predominant specie. The results also indicated that adsorbed Se may be transformed into plant-available Se with time. Cationic presence enhanced selenite immobilization, with Fe being the most effective followed by Mn and Ca. The column leaching study indicated selenate had a faster mobilization rate, and there was a probable antagonistic relationship between Se species and sulfate in mine spoil solutions.Additional

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Section: Resultssupporting

confidence: 59%

Understanding Selenium Mobility by Sorption and Extraction Processes in Surface Coal Mine Spoils

Sharmasarkar¹,

Vance²,

Reddy³

et al. 1995

ASMR

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“…And in a column leaching study, Ahlrichs and Hossner [34] studied Se(VI) adsorption onto a sandy loam containing 25% clay, noting little Se(VI) retention. However, Singh et al [35] indicated that calcium carbonate and soil clay content play an important role in Se(VI) adsorption. It appears that calcium carbonate, clays, and amorphous Al(OH) 3 play important roles in WTR-Se(VI) adsorption.…”

Section: Methodsmentioning

confidence: 99%

“…It is not fully known why Se(IV) to Se(0) reduction in the presence of WTR occurred across the pH range examined in this study. The WTR utilized contained 6.3% organic matter (Table 1), and Singh et al [35] found a positive correlation between soil organic carbon content and Se(IV) adsorption but did not identify selenite reduction. Absent from the literature are extensive studies of selenium reactions with Mn(II) and Mn(III) mineral oxides.…”

mentioning

confidence: 99%

Selenium adsorption to aluminum-based water treatment residuals

Ippolito

Scheckel

Barbarick

2009

Journal of Colloid and Interface Science

107

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a b s t r a c tAluminum-based water treatment residuals (WTR) can adsorb water-and soil-borne P, As(V), As(III), and perchlorate, and may be able to adsorb excess environmental selenium. WTR, clay minerals, and amorphous aluminum hydroxide were shaken for 24 h in selenate or selenite solutions at pH values of 5-9, and then analyzed for selenium content. Selenate and selenite adsorption edges were unaffected across the pH range studied. Selenate adsorbed on to WTR, reference mineral phases, and amorphous aluminum hydroxide occurred as outer sphere complexes (relatively loosely bound), while selenite adsorption was identified as inner-sphere complexation (relatively tightly bound). Selenite sorption to WTR in an anoxic environment reduced Se(IV) to Se(0), and oxidation of Se (0) or Se(IV) appeared irreversible once sorbed to WTR. Al-based WTR could play a favorable role in sequestering excess Se in affected water sources.Published by Elsevier Inc.

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“…The experimental evidence suggests that cryptocrystalline and amorphous forms of Si02, Al2O3, and Fe203 control Se adsorption (John et al . 1976, Singh et al 1981. Studies with pure mineral phases demonstrate that hydrous oxides of Fe an Al and amorphous aluminosilicates have a high aftinty for Se(IV, VI) (Leckie et al 1980, Hingston et al 1968, which significantly exceeds that of layer lattice silicates (Frost andGriffin 1977, Hamdy andGisselNelson 1977).…”

Section: Sorptionmentioning

confidence: 99%

“…Studies with pure mineral phases demonstrate that hydrous oxides of Fe an Al and amorphous aluminosilicates have a high aftinty for Se(IV, VI) (Leckie et al 1980, Hingston et al 1968, which significantly exceeds that of layer lattice silicates (Frost andGriffin 1977, Hamdy andGisselNelson 1977). Though selenite (PIC,: 7.9) and selenate @K2: 1.7) differ appreciably in their acidity, little difference is seen in their adsorption by soil (Singh et al 1981). Selenate may be adsorbed more strongly by clay minerals than selenite (Frost and Griffin 1977), while the inverse applies to hydrous oxides of Fe (Leckie et al 1980, Benjamin andBloom 1981).…”

Section: Sorptionmentioning

confidence: 99%