Relação entre adsorção de metais pesados e atributos químicos e físicos de classes de solo do Brasil

Araújo, W. S. de; Sobrinho, N. M. B. Amaral; Mazur, Nelson; Gomes, Paulo César Ribeiro

doi:10.1590/s0100-06832002000100003

Cited by 28 publications

(23 citation statements)

References 13 publications

(13 reference statements)

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“…The metal ions can be eletrostatically adsorbed to such materials, or specifically, through covalent or partly covalent bindings to oxygen atoms from the mineral structure (Araújo et al, 2002). For soils as well as for kaolinite or Fe, Al and Mn oxides, the relative sequence of adsorption is: Cu > Zn > Ni.…”

Section: +mentioning

confidence: 99%

Nickel adsorption by soils in relation to pH, organic matter, and iron oxides

Mellis

Cruz

Casagrande

2004

Sci. agric. (Piracicaba, Braz.)

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There is little information on nickel adsorption by Brazilian soils. The objective of this experiment was to determine the effect of pH, organic matter, and iron oxides on nickel adsorption by three soils: a clayey Anionic "Rhodic" Acrudox, a sandy clay loam Anionic "Xanthic" Acrudox, and a clayey Rhodic Hapludalf. Soil samples were collected from the 0-0.2 m layer and treated to eliminate organic matter and iron oxides. The nickel adsorption was evaluated in the original samples and in those treated to remove organic matter and to remove both, organic matter and iron oxides, using 2 g soil + 20 mL of 0.01 mol L -1 CaCl 2 solution containing 5 mg L -1 Ni, pH varying from 3.5 to 7.5. The nickel adsorption decreased with the elimination of organic matter. For the samples without organic matter and iron oxides, adsorption decreased only in the Anionic "Rhodic" Acrudox. The pH was the main factor involved in nickel adsorption variation, and for soil samples without organic matter and iron oxides, the maximum adsorption occurred at higher pH values. Key words: Ni adsorption, tropical soils ADSORÇÃO DE NÍQUEL EM SOLOS EM FUNÇÃO DE pH, MATÉRIA ORGÂNICA E ÓXIDOS DE FERRORESUMO: Há poucas informações disponíveis na literatura quanto à adsorção de níquel em solos do Brasil. O objetivo deste trabalho foi determinar a influência do pH, da matéria orgânica, e dos óxidos de ferro na adsorção de níquel em amostras da camada superficial (0 a 0,20 m) de um Latossolo Vermelho acriférrico típico (LVwf), textura argilosa, um Latossolo Amarelo ácrico típico (LAw), textura argilo-arenosa e um Nitossolo Vermelho eutroférrico (NVef), textura muito argilosa. Foram utilizadas amostras de solo natural, de solo sem matéria orgânica (MO), e de solo sem matéria orgânica e sem óxidos de ferro, para fazer envelopes de adsorção (2,0 g de solo + 20 mL de solução contendo 5 mg L -1 de Ni em CaCl 2 0,01 mol L -1

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Section: +mentioning

confidence: 99%

Nickel adsorption by soils in relation to pH, organic matter, and iron oxides

Mellis

Cruz

Casagrande

2004

Sci. agric. (Piracicaba, Braz.)

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“…The model is a representation in small scale or a simplified representation of reality. An ideal model is effective when it describes precisely the observations; it is comprehensive, when it can be applied to a large range of conditions without modifications; it is realistic, when it confirms to the accepted theories of behavior; and it is predictive, when it can be applied to the most different conditions (Barrow & Bowden, 1987).…”

Section: Adsorption Modelsmentioning

confidence: 99%

“…On the other hand, the competition did not affect Cu and Pb adsorptions, which implies in a more specific retention mechanism, involving covalent bonds between these elements and soil minerals. Araújo et al (2002) employed the path coefficient analysis to evaluate both models and the ratio among the adsorption parameters obtained for some metals, such as Cd, Cu and Zn, and the characteristics of a series of tropical soils. Using the Langmuir model, Fontes & Gomes (2003) evaluated the competitive adsorption of Cr, Ni, Cu, Zn, Cd, and Pb in Brazilian representative soils (Oxisols, Ultisols and Alfisol) after OM removal and noticed that the metals with the most competitive effect were Cr, Cu and Pb.…”

Section: Langmuir Modelmentioning

confidence: 99%

“…The original model, assumed that surface groups of soil particles formed inner-sphere complexes only with protons and hydroxyl ions, while metals and ligands formed outer-sphere complexes with the particle surface. The model was modified afterwards (Blesa et al, 1984;Hayes & Leckie, 1986;Hayes et al, 1988) in order to include inner-sphere complexes. The modified version of the TLM allows for the adsorption of metals and ligands in the inner-sphere plan, forming inner-sphere complexes.…”

Section: Triple -Layer Modelmentioning

confidence: 99%

“…Therefore, it can be greatly applied on soils and minerals (Barrow, 1987). The reaction between an ion and a soil charged surface includes a component that reflects a chemical attraction between both.…”

Section: Four-layer Model (Flm)mentioning

confidence: 99%

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Electrochemical attributes and availability of nutrients, toxic elements, and heavy metals in tropical soils

Fontes¹,

Alleoni²

2006

Sci. agric. (Piracicaba, Braz.)

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Electrochemical properties of soils are very important for the understanding of the physico-chemical phenomena which affect soil fertility and the availability of nutrients for plants. This review highlights the electrochemical properties of tropical soils, the behavior and the availability of nutrients, toxic elements and heavy metals in the soil, especially for soils with predominant variable charge minerals. Availability of the elements is related to ionic exchange, solution speciation, and electrostatic and specific adsorptive soil properties. Empirical and surface complexation models are briefly described, and some results of their application in tropical soils are presented. A better understanding of the role of the double diffuse layer of charges and CEC on nutrient cation availability for highly weathered soils is required, as well as a solid comprehension of surface complexation models, in order to improve the knowledge regarding the behavior of anions in soils. More studies have to be conducted to generate results that enable the use of chemical speciation concepts and calculation of several constants used in surface complexation models, especially for highly weathered soils from the humid tropics. There has to be a continuing development and use of computer softwares that have already incorporated the concepts of chemical speciation and adsorption models in the study of nutrients, toxic elements and heavy metal availability in the soil-plant system. Key words: electric charge, adsorption, model, ionic exchange, speciation ATRIBUTOS ELETROQUÍMICOS E DISPONIBILIDADE DE NUTRIENTES, ELEMENTOS TÓXICOS E METAIS PESADOS EM SOLOS TROPICAISRESUMO: As propriedades eletroquímicas dos solos tropicais são muito importantes para entendimento dos fenômenos físico-químicos que afetam a fertilidade do solo e a disponibilidade dos nutrientes das plantas. Essa revisão destaca os atributos eletroquímicos de solos e o comportamento e a disponibilidade de nutrientes, elementos tóxicos e metais pesados no solo, especialmente aqueles com predominância de minerais com cargas variáveis. A disponibilidade dos elementos é relacionada com a troca iônica, especiação da solução e propriedades adsortivas eletrostáticas e específicas do solo. Modelos empíricos e de complexação de superfície são brevemente descritos, e são apresentados resultados de sua aplicação em solos tropicais. É necessário um melhor entendimento do papel da dupla camada difusa de cargas e da CTC na disponibildade de nutrientes em solos altamente intemperizados, assim como uma melhor compreensão dos modelos de complexação de superfície, a fim de melhorar o entendimento do comportamento dos ânions no solo. Mais estudos devem ser conduzidos para gerar resultados que tornem possível o uso de conceitos de especiação química e o cálculo de diversas constantes usadas em modelos de complexação, especialmente para solos altamente intemperizados do trópico úmido. Deve haver um contínuo desenvolvimento de programas computacionais que já tenham incorporado os conc...

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Assessing heavy metal sources in sugarcane Brazilian soils: an approach using multivariate analysis

Silva

Nascimento

Araújo

et al. 2016

Environ Monit Assess

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Brazil is the world's largest sugarcane producer and soils in the northeastern part of the country have been cultivated with the crop for over 450 years. However, so far, there has been no study on the status of heavy metal accumulation in these long-history cultivated soils. To fill the gap, we collect soil samples from 60 sugarcane fields in order to determine the contents of Cd, Cr, Cu, Ni, Pb, and Zn. We used multivariate analysis to distinguish between natural and anthropogenic sources of these metals in soils. Analytical determinations were performed in ICP-OES after microwave acid solution digestion. Mean concentrations of Cd, Cr, Cu, Ni, Pb, and Zn were 1.9, 18.8, 6.4, 4.9, 11.2, and 16.2 mg kg(-1), respectively. The principal component one was associated with lithogenic origin and comprised the metals Cr, Cu, Ni, and Zn. Cluster analysis confirmed that 68 % of the evaluated sites have soil heavy metal concentrations close to the natural background. The Cd concentration (principal component two) was clearly associated with anthropogenic sources with P fertilization being the most likely source of Cd to soils. On the other hand, the third component (Pb concentration) indicates a mixed origin for this metal (natural and anthropogenic); hence, Pb concentrations are probably related not only to the soil parent material but also to industrial emissions and urbanization in the vicinity of the agricultural areas.

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Relação entre adsorção de metais pesados e atributos químicos e físicos de classes de solo do Brasil

Cited by 28 publications

References 13 publications

Nickel adsorption by soils in relation to pH, organic matter, and iron oxides

Nickel adsorption by soils in relation to pH, organic matter, and iron oxides

Electrochemical attributes and availability of nutrients, toxic elements, and heavy metals in tropical soils

Assessing heavy metal sources in sugarcane Brazilian soils: an approach using multivariate analysis

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