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Your search keyword '"Magalhães, Marcio Osvaldo Lima"' showing total 3 results
Start Over Author "Magalhães, Marcio Osvaldo Lima" Topic contamination
3 results on '"Magalhães, Marcio Osvaldo Lima"'

1. Reducing conditions on barium absorption in rice plants cultured in BaSO4-enriched soil doi: 10.4025/actasciagron.v36i1.17539

Author

Magalhães, Marcio Osvaldo Lima, Sobrinho, Nelson Moura Brasil do Amaral, Zonta, Everaldo, Becerra, Alfredo Tolón, Lastra-Bravo, Xavier Bolívar, and Coutinho, Izabella Bezerra

Subjects
contamination, digestive, oral, and skin physiology, otorhinolaryngologic diseases, food and beverages, Química do Solos, Oryza sativa, lcsh:Agriculture (General), lcsh:S1-972, digestive system diseases, barite
Abstract

To evaluate the possible solubilization of barium sulfate in soils under reducing conditions and its effects on barium bioavailability, an Oryza sativa pot trial was established. Increasing barium doses and two redox potential conditions were evaluated. The geochemical fractionation data demonstrated that reducing conditions led to an increase in the levels of more labile forms of barium and a reduction in more stable forms. Furthermore, higher doses of barium were found to have a negative impact on grain production. The highest levels of barium accumulation in the leaves, roots, and grains were observed with the highest barium dose under reducing conditions. These results demonstrate that reducing conditions increased barium bioavailability and absorption by rice plants.

Published
2014

2. Barium absorption by rice plants (Oryza sativa L.) and mobility in soil treated with barite under different redox potential conditions

Author

Lima, Erica Souto Abreu, Amaral Sobrinho, Nelson Moura Brasil do, Magalhães, Marcio Osvaldo Lima, Guedes, Jair do Nascimento, and Zonta, Everaldo

Subjects
leaching, contamination, digestive, oral, and skin physiology, food and beverages, complex mixtures, redox potential
Abstract

Two parallel tests were carried out to evaluate barium solubility in soils treated with barite under reducing conditions: one in leaching columns and another with potted plants cultivated with rice. Soils were treated with three doses of barite and kept at two humidity levels. The reduction (-200 mV) condition promoted an increase in barium in the geochemical fraction of higher liability, higher concentrations of barium in the leached extracts, and higher absorption by rice plants. As a result of increased uptake and accumulation of barium, the plants showed stunted growth

Published
2012

3. Contenido de elementos metálicos en suelos característicos del municipio San José de las Lajas.

Author

López, Yusimí Pérez, Sobrinho, Nelson Moura do Amaral, Arias, María Irene Balbín, Carmenate, Ramiro Valdés, and Magalhães, Marcio Osvaldo Lima

Subjects
*HEAVY metals & the environment, *SOIL pollution, *WATER pollution, *AIR pollution, *POLLUTION, *ENVIRONMENTAL research, *POLLUTANTS
Abstract

At the moment, in all the regions of the world it has been informed about the human necessity of having an acceptable environment in all the orders, being in fact that of their contamination one of the most sensitive from the social point of view. The susceptible natural means and that in fact they are being contaminated they are: the water, the soil and the air. Associated to processes of contamination they are metallic elements (heavy metals (MP) that are present in soils either as natural components or results of the human activity. In numerous countries it has been possible to evaluate the extension of the contamination comparing the total tenors of MP in an area given with the op- posing ones under natural conditions or through value guides (VO); however in our country they have not been possible to settle down under natural conditions and it has been had to use for their study the methodologies of countries like Brazil. Keeping in mind this antecedent in the work two types of soils was selected with low activity antrópica; the tenors of Cd were determined, Cr, Cu, Fe, Mn, Ni, Zn and the physical-chemical properties were analyzed to obtain the best statistical relationships that could be employees in the estimate of values of concentration of MP under natural conditions. The methodology for the extraction with regal water of the metals in the soils was proposed by ISO 11466. The obtained results allow establishing a novel methodology to propose for the first time you value guides of heavy metals in soils with little agricultural activity. [ABSTRACT FROM AUTHOR]

Published
2012

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