Kinetics of selenate and selenite adsorption/desorption at the goethite/water interface

Zhang, Pengchu; Sparks, Donald L.

doi:10.1021/es00082a010

Cited by 255 publications

(186 citation statements)

References 18 publications

(29 reference statements)

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“…The significant correlations observed between As in the F1 (and F2) fraction(s) and As bioaccessibility indicates that non-specifically and specifically sorbed As are likely to constitute the main proportions of bioaccessible As. The ageing process is assumed to be initiated by a gradual shift from the rapid formation of out-sphere (electrostatic) complexes to inner-sphere (chemical) complexes with increasing reaction time (Zhang and Sparks, 1990). Thus, the ageing process, involving a shift from outer-sphere As complexes to inner-sphere As, and then gradually to even less labile fractions including F3, F4 and F5 will result in a decrease in As bioaccessibility.…”

Section: The Relationship Between As Fractionation and Bioaccessibilitymentioning

confidence: 99%

“…lead, Pb 2+ ; selenite, SeO 2À 3 : selenate, SeO 2À 4 ) on soil surfaces initially form outer-sphere complexes, followed by the formation of inner-surface complexes (Hayes and Leckie, 1986;Zhang and Sparks, 1990). Upon ageing, intraparticle surface diffusion of metal contaminants within micropores may result in reduced lability, and may also result in nucleation and surface precipitation (Ford and Sparks, 2000;Axe and Trivedi, 2002).…”

Section: Introductionmentioning

confidence: 99%

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The ageing effect on the bioaccessibility and fractionation of arsenic in soils from China

et al. 2007

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Ingestion of contaminated soil has been recognized as an important exposure pathway of arsenic for humans, especially for children through outdoor hand-to-mouth activities. An improved sequential extraction procedure was employed in an attempt to reveal the relationship between bioaccessibility and fractionation of As in five soils from China. Arsenic bioaccessibility in acidic (%pH 4.5) soils reached approximately stable levels after a sharp decline within one week of ageing. In contrast, As bioaccessibility in higher pH (>6.0) soils was found to be significantly higher and took two weeks of ageing to reach stable levels. The artificially added As was more labile than indigenous As. The main proportions of added As were found in the specifically sorbed and amorphous and poorly-crystalline hydrous Fe/Al oxide-bound fractions. Correlation analysis shows that the non-specifically and specifically sorbed As are likely to constitute the main proportion of bioaccessible soil As. The soil content of amorphous and crystalline Fe/Al oxides and soil pH appear to be the key factors controlling, not only the time needed to reach a steady state, but also the magnitude of the bioaccessibility of As added to the soils.

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Section: The Relationship Between As Fractionation and Bioaccessibilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The ageing effect on the bioaccessibility and fractionation of arsenic in soils from China

et al. 2007

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“…Les oxy-hydroxydes métalliques et, dans une moindre mesure, les minéraux argileux sont considérés comme les composantes clés du processus d'adsorption (Balistrieri et Chao, 1987 ;Zhang et Sparks, 1990 ;Dynes et Huang, 1997 ;Forsberg et al, 2001 ;Jacquier et al, 2001). Les cinétiques d'adsorption sur les phases pures sont rapides : quelques heures à quelques jours (Su et Suarez, 2000 ;Duc et al, 2003).…”

Section: Séléniumunclassified

Comportement de radionucléides (Cs, I, Sr, Se, Tc) dans le sol : proposition de valeurs de Kd par défaut

Roussel-Debet

Colle

2005

Radioprotection

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“…Nevertheless, is worth emphasizing that, in biofortification programs the form of selenium applied must be taken into account (Zhang and Sparks, 1990), since plant species not have different uptake capacities, but also the accumulation of selenium forms (selenite, selenite and organic forms of selenium) in the soil can vary (Kabata-Pendias, 1999 cf. Hawrylak and Szymanska, 2004).…”

Section: Introductionmentioning

confidence: 99%

Selenium Biofortification in Rice - A pragmatic perspective

Oliveira

Pataco

Mourinho

et al. 2015

Emir. J. Food Agric

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Selenium is an antioxidant trace mineral with important biochemical functions related to the enzymatic activity of selenoproteins. Due to a wide variation in the content of selenium from different plant sources, there is a high risk of deficiency of this nutrient in human nutrition, and particularly in the early childhood. Thus, the use of biofortified staple foods, namely selenium rice flour can be understood as an important trait, namely for food production for infants. This study aims to evaluate the importance of selenium biofortified rice flour, further considering baby foods.

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Kinetics of selenate and selenite adsorption/desorption at the goethite/water interface

Cited by 255 publications

References 18 publications

The ageing effect on the bioaccessibility and fractionation of arsenic in soils from China

The ageing effect on the bioaccessibility and fractionation of arsenic in soils from China

Comportement de radionucléides (Cs, I, Sr, Se, Tc) dans le sol : proposition de valeurs de Kd par défaut

Selenium Biofortification in Rice - A pragmatic perspective

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