Comparison of adsorption characteristics of Se(IV) and Se(VI) onto hematite: effects of reaction time, initial concentration, pH, and ionic strength

Jang, Mijeong; Pak, Seyoung; Kim, Myoung-Jin

doi:10.1007/s12665-015-4103-6

Cited by 19 publications

(9 citation statements)

References 13 publications

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“…Selenite (Se(IV)) and selenate (Se(VI)) received more attention due to their higher mobility compared to other species. Compared to selenite, selenate (Se(VI)), i.e., HSeO 4 and SeO 4 2-, shows lower adsorption under the same conditions (Jang et al, 2015). The D a value of 1.7 × 10 -11 m 2 /s in Boom clay was an order of magnitude lower than that of HTO (Beauwens et al, 2005).…”

Section: Introductionmentioning

confidence: 95%

pH effect on Re(VII) and Se(IV) diffusion in compacted GMZ bentonite

Wang

et al. 2016

Applied Geochemistry

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Section: Introductionmentioning

confidence: 95%

pH effect on Re(VII) and Se(IV) diffusion in compacted GMZ bentonite

Wang

et al. 2016

Applied Geochemistry

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“…The adsorption constants for selenate on hematite were retrieved from the experimental data by Peak and Sparks (2002), Jang et al (2015) and Borsig et al (2017). For their fitting, the values for N s , K 1 and K 2 were taken from Usiyama and Fukushi (2016), and those for C 1 (=C 2 ), K C+ and K A-were obtained from the theoretical prediction by Sverjensky (2005).…”

Section: Etlm Treatmentmentioning

confidence: 99%

A comprehensive predictive model for selenate adsorption on oxide minerals

2021

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“…This is the pH value considered suitable for adequate growth of several crops in Brazil. The Se doses were chosen based on previous studies where selenite has shown to be much more adsorbed than selenate, which thus require greater concentrations of selenite to be added (Gabos et al, 2014b;Jang et al, 2015;Araujo et al, 2018Araujo et al, , 2020.…”

Section: Adsorption and Desorption Proceduresmentioning

confidence: 99%

How sulfate content and soil depth affect the adsorption/desorption of selenate and selenite in tropical soils?

Araujo¹,

Lessa²,

Chanavat³

et al. 2020

Revista Brasileira De Ciência Do Solo

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Sorption of selenate (SeO 4 2-) and selenite (SeO 3 2-) is poorly understood in Brazilian agroecosystems, especially in soils from agricultural areas containing different contents of competing anions, such as sulfate (SO 4 2-). This study aimed to assess the sorption behavior of selenate and selenite at different soil layers of a tropical soil treated with different rates of agricultural gypsum (thus, containing different contents of sulfate), collected under a coffee plantation. Soil samples from an experimental area where phosphogypsum has been previously applied at different rates (0, 7, 14, and 56 t ha-1) were taken at the following soil layers: 0.15-0.25, 0.35-0.45, and 1.25-1.35 m. Adsorption experiments were carried out adding 20 mL of solutions containing 100 and 500 μg L-1 of selenate and 10 and 15 mg L-1 of selenite to 2 grams of soil. Desorption experiments were also performed using a soil:solution ratio of 1:10. Adsorption of selenate increased with soil depth and decreased upon increasing sulfate contents in the soil, by contrast, selenite was consistently adsorbed at higher contents-when compared with selenate-at any soil depth and its sorptive behavior was not affected by the presence of sulfate. Furthermore, selenite was less desorbed than selenate under all conditions. In conclusion, selenite is much more retained in tropical soils and less available to plants than selenate. Also, although sulfate has shown to be able to hinder selenate retention, it has no substantial effect on the sorption behavior of selenite in tropical agroecosystems.

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Comparison of adsorption characteristics of Se(IV) and Se(VI) onto hematite: effects of reaction time, initial concentration, pH, and ionic strength

Cited by 19 publications

References 13 publications

pH effect on Re(VII) and Se(IV) diffusion in compacted GMZ bentonite

pH effect on Re(VII) and Se(IV) diffusion in compacted GMZ bentonite

A comprehensive predictive model for selenate adsorption on oxide minerals

How sulfate content and soil depth affect the adsorption/desorption of selenate and selenite in tropical soils?

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