Adsorption of Selenite and Phosphate on an Allophane Clay

Rājan, S. S. S.; Watkinson, J. H.

doi:10.2136/sssaj1976.03615995004000010017x

Cited by 59 publications

(39 citation statements)

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“…The release of OHaccompanied with Se(IV) sorption on allophane clay was larger than that by P(V) sorption (Rajan and Watkinson 1976). Although most researchers have concluded that the increase in the solution pH with a certain anion adsorption on particles indicates the release of OH -from the particle surface, our results are based on the reaction (5) described by Zhang and Sparks (1990).…”

Section: (V) [ As(v)=se(iv) [ Silicate (Si(iv)) [ Mo(vi) [ Sulfate (Smentioning

confidence: 57%

Adsorption Sequence of Toxic Inorganic Anions on a Soil

Saeki

2008

Bull Environ Contam Toxicol

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The adsorption of six anions (arsenate(As(V)), chromate(Cr(VI)), fluoride(F(-I)), molybdate(Mo(VI)), selenate(Se(VI)), and selenite(Se(IV))) on an andosol and the concomitant H(+) consumptions together with the sorption were investigated to understand the behaviors of toxic inorganic anions in environment. Based on the estimated adsorption maximum by the simple Langmuir equation, the order of adsorption affinity to the andosol at a suspension pH of 5.0 was F(-I) > > phosphate(P(V)) > Se(IV) > Mo(VI) >or= As(V) > > Se(VI) >or= Cr(VI) >or= nitrate(N(V)). The order of the concomitant H(+) consumptions together with the adsorption was F(-I) > > P(V) > Se(IV) > Mo(VI) >or= As(V), while they were not observed in the adsorption of Se(VI), Cr(VI) and N(V).

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Section: (V) [ As(v)=se(iv) [ Silicate (Si(iv)) [ Mo(vi) [ Sulfate (Smentioning

confidence: 57%

Adsorption Sequence of Toxic Inorganic Anions on a Soil

Saeki

2008

Bull Environ Contam Toxicol

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“…This fern can be categorized as a Se-accumulator, according to the standards suggested by Baker (1981). Simultaneously, the higher Se accumulation for Chinese brake fern in nutrient solution culture than that in soil culture indicate that selenite might probably be adsorbed in soils (Rajan and Watkinson 1976). The adsorption of Se in soils may significantly retard the uptake of Se by Chinese brake fern.…”

Section: Discussionmentioning

confidence: 99%

Effects of Se on the uptake of essential elements in Pteris vittata L.

Feng

Wei

et al. 2009

Plant Soil

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Selenium has been proven to be an antioxidant in plants at low dosages. To understand better the mechanisms of Se toxicity and benefit to plants, more investigations about effects of Se on the uptake of essential elements in plants would be desirable. In this study, hydroponic (nutrient solution culture) and pot (soil culture) experiments were simultaneously conducted to investigate the effects of Se on the uptake and distribution of essential elements in Pteris vittata. L (Chinese brake fern), an arsenic (As)-hyperaccumulator and a selenium (Se)-accumulator. Chinese brake fern took up much more Se in nutrient solution culture than in soil culture, with the highest Se content recorded as 1,573 mg kg −1 in the roots, demonstrating remarkable tolerance to Se. In soil culture, Chinese brake fern also accumulated high content of Se, with the highest content measured as 81 mg kg −1 and 233 mg kg

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“…The sorption of selenite onto mineral and oxide surfaces has been very extensively studied (e.g. Hingston et al 1974;Rājan and Watkinson 1976;Parfitt 1978;Rajan 1979;Balistrieri and Chao 1987;Saha et al 2004) and thought to explain the poor bioavailability of Se in soil. Overall, studies on the behaviour of Se in soil have emphasized the inorganic chemistry of Se.…”

Section: Discussionmentioning

confidence: 99%

Selenium fractions in selenate-fertilized field soils of Finland

Keskinen

Räty

Yli‐Halla

2011

Nutr Cycl Agroecosyst

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Depending on the soil environment, selenium (Se) can exist as several species differing greatly in bioavailability. Characterization of soil Se reserves is thus necessary in assessing the nutritional supply of this essential element. In low-Se areas, Se fertilization is an option for securing adequate Se nutrition. Fertilization is, however, challenged by the unknown fate of the residual Se. In this study, we aimed to clarify the Se status of selenate-fertilized field soils by fractionating soil Se into five pools: salt-soluble (KCl), adsorbed (KH 2 PO 4 /K 2 HPO 4 ), organically associated (NaOH), elemental (Na 2 SO 3 ) and recalcitrant Se (NaOCl). Changes induced in these fractions by repeated application of low selenate doses were examined by comparing samples collected from the same locations in 1992 and 2004. The distribution of Se among the five fractions was relatively similar in all soils. On average, 1% of the amount of Se acquired was salt-soluble, 17% adsorbed, 39% organically associated, 14% elemental and 29% recalcitrant organic Se or metal selenides. The added Se was distributed among several fractions, leading to a relatively small change in each fraction. However, in mineral soils (n = 5), a significant increase in soil Se concentration was found between 1992 and 2004 in adsorbed, organically associated and recalcitrant Se, as well as in the total amount of Se acquired as a sum of the fractions. Our findings provide the first field-scale experimental support for the theoretical assumption of accumulation of residual selenate in acidic mineral soil in insoluble form.

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Adsorption of Selenite and Phosphate on an Allophane Clay

Cited by 59 publications

References 0 publications

Adsorption Sequence of Toxic Inorganic Anions on a Soil

Adsorption Sequence of Toxic Inorganic Anions on a Soil

Effects of Se on the uptake of essential elements in Pteris vittata L.

Selenium fractions in selenate-fertilized field soils of Finland

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