Adsorption of Heavy Metal Cations on Hydrated Oxides and Oxides of Iron and Aluminum with Different Crystallinities

Okazaki, Masanori; Takamidoh, Keiji; Yamane, Ichirō

doi:10.1080/00380768.1986.10557535

Cited by 54 publications

(25 citation statements)

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“…The "Rhodic" Acrudox presented higher Fe t , Fe d , Al t and Al d concentrations when compared to the two other soils, and higher and similar amorphous Fe-oxide concentration when compared to "Xanthic" Acrudox and Rhodic Hapludalf, respectively (Table 2). Although the hydrated Fe oxides and hydroxides, that appear amorphous under X-ray diffraction, present higher adsorption capacity (Okazaki et al, 1986) and also higher amount of positive charges (Yu, 1997) than the crystalline ones, they are not responsible for the higher Ni adsorption capacity of "Rhodic" Acrudox, despite the fact that this latter soil presents higher Fe o concentration. On the other hand, the "Xanthic" Acrudox and Rhodic Hapludalf presented higher quantity of kaolinite than "Rhodic" Acrudox, which might have compensated lower Ni ad- Table 3 -Nickel adsorbed by soil samples from the 0-0.2 m layer depth, before and after the organic matter removal (OMfree soil) and organic matter + Fe-oxide removal (OM + FeOx-free soil).…”

Section: Resultsmentioning

confidence: 88%

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: Resultsmentioning

confidence: 88%

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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“…Segundo Okazaki et al (1986), a retenção de íons metálicos por superfícies de óxidos é inversamente dependente do grau de cristalinidade e, por causa das cargas variáveis dos óxidos, dependente do pH.…”

Section: Resultsunclassified

Fracionamento, dessorção e extração química de zinco em latossolos

Nascimento

Fontes

Neves

et al. 2002

Rev. Bras. Ciênc. Solo

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RESUMOO conhecimento das formas químicas do Zn no solo, bem como de suas relações com os teores disponíveis para as plantas, é importante para a previsão do comportamento desse micronutriente. Este trabalho teve como objetivo estudar a influência da calagem e de doses de Zn sobre a dessorção, extração e fracionamento desse elemento em amostras de seis Latossolos. As amostras, com e sem calagem, receberam 0, 20 e 40 mg dm -3 de Zn e foram incubadas por 30 dias. Após a incubação, foram determinados os teores de Zn pelos extratores Mehlich-1, Mehlich-3, DTPA e EDTA. Os teores de Zn foram determinados nas frações: trocável, matéria orgânica, óxido de manganês, óxido de ferro amorfo e óxido de ferro cristalino, residual, além dos teores totais. A dessorção foi avaliada mediante extrações sucessivas com resina de troca catiônica. Com a aplicação de Zn, esse elemento foi retido, principalmente, nas frações trocável e matéria orgânica. A calagem provocou drástica redução nos teores de Zn trocável e aumento nas frações: matéria orgânica, óxidos de ferro amorfo e cristalino e óxidos de manganês. Nos solos sem calagem, todos os extratores correlacionaramse significativamente com a fração Zn trocável, enquanto, nos solos com calagem, essa correlação foi significativa com o Zn na fração orgânica. Nos solos sem calagem, o teor de Zn dessorvido das frações decresceu na seguinte ordem: trocável = matéria orgânica > óxido de manganês > óxido de ferro amorfo >> óxido de ferro cristalino, com os extratores EDTA, Mehlich-1 e Mehlich-3, apresentando as melhores correlações com o total dessorvido. A calagem provocou ausência de dessorção para o Zn Termos de indexação: micronutrientes, calagem, análise de solo.

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“…Compared with cadmium, water-soluble copper is 0.8-9.2% of total copper in soil, and it does not dissolve easily in water. This is due to the fact that, compared to cadmium, a greater proportion of copper is in a form contained within crystal structures 17 . In soil G, the amount of water-soluble cadmium and copper extracted with water from soil sampled was lower in deeper soil layers (Table 1).…”

Section: Discussionmentioning

confidence: 99%

Chemical Form of Soluble Cadmium and Copper in Arable Soils and its Implication to their Mobility

Sakurai¹,

Murayama²,

Makino³

et al. 2007

JARQ

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To clarify the chemical form of soluble cadmium and copper in arable soils, the molecular weight distribution and ion composition of water-soluble cadmium and copper in soils were investigated. The solution extracted with water from soil was fractionated by ultrafiltration and then cadmium and copper in 4 molecular weight size classes were determined. About 50% of water-soluble cadmium was present in the fraction with a molecular weight of 500 or less, 12-25% in the fraction with a molecular weight of 500-300,000 and 25-37% in the fraction with a molecular weight of 300,000 or more. For copper, 4-19% was present in the fraction with a molecular weight of 500 or less and 40-75% was present in the fraction with a molecular weight of 10,000-300,000 and 300,000 or more. The water-soluble heavy metals were also fractionated with ion exchange resin. More than 90% of cadmium was detected in the cation fraction. Conversely, approximately 80% of copper was detected in the anion fraction. These results indicate that water-soluble cadmium in soil is present as divalent cations, and copper is dissolved in a form bonded with substances such as organic matter in soil. To understand the difference in the mobility of cadmium and copper in soils, a plastic container was filled with moist soil and the soil moisture was allowed to evaporate only from the upper part of the container. Water-soluble cadmium was concentrated to a level of 68.5 times the background concentration at the top of the soil and copper was concentrated to 6 times the background concentration. Such a difference in the mobility was discussed in relation to the chemical form of soluble cadmium and copper.Discipline: Agricultural environment Additional key words: heavy metal, ion exchange resin, ultrafiltration JARQ 41 (2), 139 -145 (2007)

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Adsorption of Heavy Metal Cations on Hydrated Oxides and Oxides of Iron and Aluminum with Different Crystallinities

Cited by 54 publications

References 9 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

Fracionamento, dessorção e extração química de zinco em latossolos

Chemical Form of Soluble Cadmium and Copper in Arable Soils and its Implication to their Mobility

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