2011
DOI: 10.1590/s0100-06832011000600016
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Sorção de selênio em solos do bioma cerrado

Abstract: O estudo da distribuição de Se em solos é de extremo interesse devido à estreita faixa entre níveis de deficiência e toxidez. A espécie química de Se com maior potencial toxicológico é o ânion selenato, em razão de sua alta mobilidade em solos, sendo assim de grande importância a compreensão de seu comportamento em solos tropicais. Foi realizado um experimento de adsorção, utilizando-se 2 g de solo em 20 mL de solução, contendo dez diferentes concentrações de Se na forma de Na2SeO4, com tempo de agitaç… Show more

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Cited by 18 publications
(15 citation statements)
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“…In the subsurface, the contribution of negative charges from organic matter is reduced, and the positive charges from these oxides may predominate, giving the soil a net positive charge. In addition, the increase in clay content with soil depth (Table S1) may also contribute to higher retention of Se in subsurface (Abreu et al, 2011;De Temmerman et al, 2014;Lessa et al, 2016). Finally, the intense rainfall, typical of those regions, may also lead to Se leaching from upper layers to the subsurface (Sharma and Singh, 1983;Tuttle et al, 2014).…”
Section: Total Soil Se Concentrationmentioning
confidence: 99%
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“…In the subsurface, the contribution of negative charges from organic matter is reduced, and the positive charges from these oxides may predominate, giving the soil a net positive charge. In addition, the increase in clay content with soil depth (Table S1) may also contribute to higher retention of Se in subsurface (Abreu et al, 2011;De Temmerman et al, 2014;Lessa et al, 2016). Finally, the intense rainfall, typical of those regions, may also lead to Se leaching from upper layers to the subsurface (Sharma and Singh, 1983;Tuttle et al, 2014).…”
Section: Total Soil Se Concentrationmentioning
confidence: 99%
“…These two components seem to reflect two mechanisms by which Se availability in the soil can be increased. Because of the mineralogy of their clay fraction, rich in Fe and Al oxides, tropical soils can have net positive surface charges under acidic conditions (Fontes et al, 2001), which give them the ability to strongly adsorb anions such as phosphate and selenite/selenate on the clay surface, reducing their availability to the plants (Abreu et al, 2011). Therefore, the increase in nuts Se concentration toward higher values of PC1 seems to reflect reduced adsorption and, consequently, higher availability of Se species in more fertile and less acidic conditions.…”
Section: Relationship Between Soil Properties and Se Concentration Inmentioning
confidence: 99%
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“…The effect of the interaction treatments-soils on SDM (Table 3) was observed in that SDM was lowest on the Argissolo Amarelo Distrófico abrúptico (Arenic Hapludult), even under application of the (Abreu et al, 2011).…”
Section: Resultsmentioning
confidence: 99%
“…As cubetas contendo os solos e as soluções salinas foram acondicionadas em Becker, e posteriormente, colocadas em uma mesa orbital modelo Solab180. Os conjuntos Beckercubetas, contendo os solos e as soluções foram agitadas de maneira contínua por um período de 24 h em uma agitação constante de 60 rpm, permitindo assim um maior contato entre os sítios de troca dos solos com as soluções salinas, conforme metodologia descrita por Abreu et al (2011). Após o período de agitação na mesa orbital, as cubetas foram transferidas para uma centrífuga angular fixa com capacidade de 12 cubetas modelo Centribio 4000 e por um período de 15 min em uma rotação constante de 1200 rpm, foram centrifugadas com a finalidade de separar a solução sobrenadante.…”
Section: Materiais E Métodosunclassified