Soil Absorption And Adsorption
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Biochar association with phosphate fertilizer and its influence on phosphorus use efficiency by maize
RESUMO O uso de fertilizantes com alguma proteção aos íons fosfato pode diminuir sua adsorção pelo solo e aumentar a absorção pela cultura, o que aumenta a eficiência da adubação. O objetivo deste trabalho foi avaliar o desempenho de um fertilizante fosfatado associado a biocarvão em um solo com alta capacidade de fixação de P. Os biocarvões fo
Ciênc. agrotec.. Publicado em: 27/05/2019
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2. Substitution of Clay Content for P-Remaining as an Index of the Phosphorus Buffering Capacity for Soils of Rio Grande do Sul
ABSTRACT Mehlich-1 soil extract is currently used in Rio Grande do Sul (RS) and Santa Catarina (SC) States, in Brazil, to evaluate soil phosphorus available to plants and Mehlich-1 is sensitive to soil buffering capacity. This limitation is overcome partly by soil separation into buffering classes based on soil clay content. However, soil clay content has so
Rev. Bras. Ciênc. Solo. Publicado em: 29/08/2016
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3. Chemical modifications in lignocellulosic fibers to obtain and use in biosensor array phenolic derivative of LCC and the biosorption of metals / Modificações químicas em fibras lignocelulósicas para obtenção e aplicação em biocompósitos de matriz fenólica derivada de LCC e na biossorção de metais
In this work, lignocellulosic fibers from two sources (sisal and banana pseudo stem) were used as reinforcing agents in the preparation of phenolic matrix composites derived from cashew nut shell liquid (CNSL) and as material to adsorb toxic metals (Pb+2, Ni+2, Cd+2, Zn+2 and Cu+2). Surface changes were induced in the sisal fibers by immersion in alkali solu
Publicado em: 2008
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4. Comportamento de metais em solo ácido de diferentes fragmentos florestais
Foram estudados 08 reflorestamentos diferentes em uma área com o mesmo tipo de solo, para avaliar o comportamento de metais com relação à matéria orgânica. A matéria orgânica dissolvida (MOD) em soluções de solo representa um papel importante no transporte de espécies quíýmicas através de solos ácidos em florestas tropicais e as relações com
Publicado em: 2007
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5. Remediation of cadmium- and lead-contaminated soils with an aluminum industry by-product / Subproduto da indÃstria de alumÃnio na remediaÃÃo de Ãreas contaminadas com cÃdmio e chumbo
Mining activities have been increasing each day and generate large amounts of residues or by-products, which have caused a lot of interest by researchers in evaluating their potential use as soil amendments. One of the applications of such amendments is on the remediation of soils contaminated with trace elements, which might pose a threat to animals and pla
Publicado em: 2006
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6. Adsorção e dessorção de cobre em solos sob aplicação de lodo de esgoto e calda bordalesa / Adsorption and desorption of copper in soils under sewage-sludge and bordeaux mixture application
The introduction of heavy metals in soil could be effectuated in differents ways, being the applications of sewage-sludge and industrial residues the most studied of them. However, traditional agricultural practices can contribute to take metals to the soil as well, through the use of mineral fertilizers, pesticides and also organic manure.The objectives of
Publicado em: 2005
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7. Mechanistic study od atrazine herbicide oxidation in the presence of minerals znd humic substances in anaerobic environmen. / Estudo do mecanismo de oxidação do herbicida atrazina na presença de minerais e sustâncias húmicas em ambiente anaeróbio.
The oxidative decomposition of atrazine was induced by hydroxyl radicals generated from the interaction between hydrogen peroxide, H2O2, and iron oxides, yielding the Fenton reaction. The reaction rate of atrazine oxidation was followed in the presence of iron minerals: goethite, ferrihydrite, and lepidocrocite; and further with humic acid (HA) extracted fro
Publicado em: 2005
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8. Síntese e caracterização de substâncias semelhantes aos ácidos húmicos de carvão de eucalipto, e sua interação com diclorofenol, cálcio, manganês e alumínio / Synthesis and characterization of humic acid-like substances from eucalypt charcoal, and its interaction with diclorofenol, calcium, manganese and aluminium
A wide range of commercial products containing humic substances have been applied successfully in agricultural and environmental remediation systems. Regarding their beneficial remediation characteristics, there is a high potential to adsorb heavy metals and organic pollutants, thus reducing their bioavailability. Industrially, they are extracted from non-re
Publicado em: 2005
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9. Adsorção competitiva de cádmio, cobre, níquel e zinco em solos. / Competitive adsorption of cadmium, copper, nickel and zinc in soils.
Among the processes involved in the behavior and the bioavailabilty of heavy metals in soil, those related with the adsorption are of great importance. Despite of the multielementary nature of the soil-solution system and the complexity of the involved reactions, the knowledge of the adsorption mechanisms in competitive systems allows a more realistic evalua
Publicado em: 2004
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10. Utilização de modelos físico-químicos de adsorção no estudo do comportamento do cobre em solos argilosos
It was evaluated the applicability of Langmuir, Freundlich and Temkin models to copper adsorption in three classes of soils. Fractions of each soil were added to test tubes containing growing concentrations of the metal in solution. The tubes were shaken and the copper concentrations were determined in the extracts by atomic absorption spectrometry (AAS). Th
Química Nova. Publicado em: 2001-06
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11. Caracterização fluorimetrica da materia organica de origem natural e sua complexação com ions cobre
Marine dissolved organic matter, which has been extracted by adsorption onto SepPak tC18 and, soil fulvic acid processed in the same way, were fractionated by reverse phase high performance liquid chromatography. Based on a stepwise elution gradient, a methodologic procedure was developed using the non-destructive UV-absorption (254 nm) detection system, to
Publicado em: 1995
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12. Poliovirus removal from primary and secondary sewage effluent by soil filtration.
Adsorption of poliovirus from primary sewage effluent was similar to that from secondary sewage effluent in both batch soil studies and experiments with soil columns 240 cm long. Virus desorption by distilled water was also similar in a soil column that had been flooded with either primary or secondary effluent seeded with virus. These results indicated that