Sorption of selenate on soils and pure phases: kinetic parameters and stabilisation

Loffredo, Nicolas; Mounier, Stéphane; Thiry, Yves; Coppin, Frédéric

doi:10.1016/j.jenvrad.2011.05.004

Cited by 15 publications

(6 citation statements)

References 53 publications

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“…To resume the results of SEP, a significant portion of exogenous Se redistributed over the course of the incubation to the Se org fraction in the alkaline Chernozem, whereas in the acidic Cambisol, it emerged in Se aqua regia ; this is in agreement with the findings of Wang et al (2017). It should be kept in mind that the distribution pattern determined for Se, based on an SEP at a given time, might be highly sensitive to the amount of exogenous SeO 4 2initially present, as Loffredo et al (2011) have shown that this parameter largely controls the rate of SeO 4 2stabilisation, especially in alkaline soil, where some Se (VI) bioreduction was assumed. Native Se in agricultural soils is frequently present in organic forms or associated with SOM (Keskinen et al 2009, Supriatin et al 2015.…”

Section: Resultssupporting

confidence: 82%

Role of sulphate in affecting soil availability of exogenous selenate (SeO42-) under different statuses of soil microbial activity

Praus¹,

Száková²

2019

PLANT SOIL ENVIRON

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We investigated sulphate application, different statuses of soil microbial activity and their joint effects as variables associated with changes in potentially plant-available selenium (Seppa) and soil Se fractionation during the course of an incubation study. The time-resolved behaviour of added selenate (400 µg Se/kg as Na2SeO4) in two agricultural soils was elucidated by means of single extraction (50 mmol/L NH4H2PO4), sequential extraction procedure (SEP) and chemical speciation analysis in phosphate extracts. The decrease in phosphate-extractable Se, a consequence of soil aging, was inhibited by sulphate (by 34% and 29% in Chernozem and Cambisol, respectively) and by gamma-irradiation (by 46% and 20% in Chernozem and Cambisol, respectively) after 72 days of incubation as compared to the control treatments. Glucose amendment dramatically decreased Seppa only in the Chernozem. After 1 year, the initial soil treatment with respect to inhibited or stimulated microbially-mediated processes substantially controlled the distribution pattern of exogenous Se as observed using the SEP. Application of sulphur fertilisers and sources of labile organic matter is thus an essential agronomic practice to correct unfavourable amounts of Seppa.

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Section: Resultssupporting

confidence: 82%

Role of sulphate in affecting soil availability of exogenous selenate (SeO42-) under different statuses of soil microbial activity

Praus¹,

Száková²

2019

PLANT SOIL ENVIRON

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“…Organic matter was not an important soil component for Se(VI), diverging from the observed for Se(IV) adsorption as can be seen in soil GM (Figure ). This behavior was explained by Loffredo et al as a consequence of the low zero point of charge of the humic substances.…”

Section: Resultsmentioning

confidence: 81%

Modeling selenium (IV and VI) adsorption envelopes in selected tropical soils using the constant capacitance model

Gabos

Goldberg

Alleoni

2014

Enviro Toxic and Chemistry

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The adsorption of selenium (Se) on soil is important because of the relevance of Se to environmental and health issues. The adsorption of Se(IV) and Se(VI) was evaluated on soil samples from São Paulo State, Brazil, as a function of varying pH, and the experimental data were fitted to the constant capacitance model. Adsorption experiments were conducted for 15 soil samples, after the addition of 20 µmol L(-1) of either Se(IV) or Se(VI), and the adjusted pH ranged between 2.5 and 10. Selenite adsorption was high for all soils, decreased with increasing pH, and was strongly correlated with Fe and Al oxide content. In contrast, Se(VI) adsorption was very low at pH values commonly found in agricultural soils, except for the highly weathered Rhodic Acrudox. The constant capacitance model fitted the Se(IV) and Se(VI) adsorption data well. Optimizations of mono- and bidentate complexation and surface protonation constants were used for the Se(IV) adsorption data. For Se(VI), optimizations for the 2 monodentate species were employed.

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“…On the contrary, Se on the active surfaces of alkaline soils may have been retained mostly as easily exchangeable, thus leading to higher Se desorption by KCl. Numerous studies support the claim that low soil pH favors the higher sorption of Se (independently of Se speciation in equilibrating solutions) [8,[51][52][53] but much less has been done on the evaluation of freshly added Se(IV)'s desorption behavior in acid and alkaline soils. The dominant role of metal oxides in the sorption-desorption behavior of Se(IV) under the conditions of the performed batch experiments is also supported by the significant negative correlations between mean Se% desorption values and oxides concentrations (Table 3).…”

Section: Selenium Desorptionmentioning

confidence: 99%

Adsorption/Desorption Patterns of Selenium for Acid and Alkaline Soils of Xerothermic Environments

2020

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Selenium adsorption/desorption behavior was examined for eight Greek top soils with different properties, aiming to describe the geochemistry of the elements in the selected soils in terms of bioavailability and contamination risk by leaching. Four soils were acid and four alkaline, and metal oxides content greatly differed between the two groups of soils. The concentrations of Se(IV) used for the performed adsorption batch experiments ranged from 1 to 50 mg/L, while the soil to solution ratio was 1 g/0.03 L. Acid soils adsorbed significantly higher amounts of the added Se(IV) than alkaline soils. Freundlich and Langmuir equations adequately described the adsorption of Se(IV) in the studied soils, and the parameters of both isotherms significantly correlated with soil properties. In particular, both KF and qm values significantly positively correlated with ammonium oxalate extractable Fe and with dithionite extractable Al and Mn, suggesting that amorphous Fe oxides and Al and Mn oxides greatly affect exogenous Se(IV) adsorption in the eight soils. These two parameters were also significantly negatively correlated with soil electrical conductivity (EC) values, indicating that increased soluble salts concentration suppresses Se(IV) adsorption. No significant relation between adsorbed Se(IV) and soil organic content was recorded. A weak salt (0.25 M KCl) was used at the same soil to solution ratio to extract the amount of the adsorbed Se(IV) that is easily exchangeable and thus highly available in the soil ecosystem. A much higher Se(IV) desorption from alkaline soils was observed, pointing to the stronger retention of added Se(IV) by the acid soils. This result implies that in acid soils surface complexes on metal oxides may have been formed restricting Se desorption.

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Sorption of selenate on soils and pure phases: kinetic parameters and stabilisation

Cited by 15 publications

References 53 publications

Role of sulphate in affecting soil availability of exogenous selenate (SeO<sub>4</sub><sup>2-</sup>) under different statuses of soil microbial activity

Role of sulphate in affecting soil availability of exogenous selenate (SeO<sub>4</sub><sup>2-</sup>) under different statuses of soil microbial activity

Modeling selenium (IV and VI) adsorption envelopes in selected tropical soils using the constant capacitance model

Adsorption/Desorption Patterns of Selenium for Acid and Alkaline Soils of Xerothermic Environments

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