Application of a new fractionation scheme for heavy metals in soils

B., Y.; Uren, N. C.

doi:10.1080/00103629509369527

Cited by 58 publications

(31 citation statements)

References 15 publications

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“…The comparatively higher level of easily reducible manganese (25.24 per cent) and iron oxide bound Mn fractions (9.67 per cent) might be due to slightly acidic to neutral pH of the soils. The high level of manganese bound in easily reducible manganese fraction was also reported by Ma and Uren (1995), Obrador et al, (2007). The carbonate bound fraction, however, constituted only 8.81 per cent of the total Mn, which may be due to low carbonates present in the studied soils.…”

Section: Iron Fractions In Polyhouse Soilsmentioning

confidence: 79%

“…The cation exchange capacity was determined by leaching of soil with 1 N NH 4 OAC and subsequently displacing the adsorbed NH 4 + with NaOAC following method of Schollenberger and Simon (1945). Sequential extraction procedure as outlined by Ma & Uren (1995) was used for evaluation of different fractions of Iron and Manganese with minor modifications.…”

Section: Methodsmentioning

confidence: 99%

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Chemical Fractions of Iron and Manganese with Different Physico-Chemical Properties in Polyhouse Soils of Himachal Pradesh, India

Mogta¹,

Sharma²

2018

Int.J.Curr.Microbiol.App.Sci

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Section: Iron Fractions In Polyhouse Soilsmentioning

confidence: 79%

Section: Methodsmentioning

confidence: 99%

Chemical Fractions of Iron and Manganese with Different Physico-Chemical Properties in Polyhouse Soils of Himachal Pradesh, India

Mogta¹,

Sharma²

2018

Int.J.Curr.Microbiol.App.Sci

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“…Among the non-residual fractions, the reducible fraction was greater than the others for procedure A, and oxidisable fraction was greater with procedure B. The relative proportion of Zn in the Mn-oxide fraction has been reported to be lower than in Fe-oxides (Ma and Uren, 1995;Li and Shuman, 1996). Rico et al (2009) compared the efficiency of the two schemes (BCR and Tessier) to elucidate metal fractionation and reported that the oxidisable step of the BCR scheme was more effective than that employed in Tessier's method.…”

Section: Extractability and Zn Distribution In Soil Fractionsmentioning

confidence: 93%

Comparison of two sequential extraction procedures for the fractionation of zinc in agricultural calcareous soils

Sepahvand

Forghani

2012

Chemical Speciation & Bioavailability

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Twenty soil samples with a wide range of chemical and physical properties were collected from typical uncontaminated soils of south-west Iran, characterised by their high calcium carbonate contents (mean value of 321 g kg À 1 ) and zinc deficiency (mean value of 0.2 mg kg À 1 for DTPA-extractable Zn). The extractability and solid-phase fractionation of Zn in the soils was determined by the single extraction procedure (DTPA extractability) and two different sequential extraction procedures: a seven-step Singh method (procedure A) and the modification of three-step BCR (Community Bureau of Reference) method (procedure B). The DTPA extractable zinc levels were low (on average 3.34%). Zinc was mainly contained in the residual fraction (91.43% for procedure A and 75.25% for procedure B). In comparison with procedure B, few relationships were established between the zinc fractions isolated by procedure A and the soil properties. The Singh scheme provided better information than the BCR scheme about Zn distribution in the soils studied.

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“…Este alto percentual para o brunizem pode significar, em princípio, a dissolução de algum óxido de manganês, devido à menor acidez do extrator M4 (Tabela 2) 51 . Lurie (1975) podem ter modificado a matriz, associada ao menor pH e à maior relação solo/extrator do reagente M5, em comparação aos outros, facilitando, com isto, maior extração de ferro (Tabela 2).…”

Section: Fração Do Ferro Lábilunclassified

Avaliação dos métodos de extração sequencial de Tessier, Keller e Miller na determinação de ferro nativo em três tipos de solos: orgânico, brunizem e latossolo

Lã¹,

Barra²,

Sobrinho³

et al. 2003

Quím. Nova

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effective to dissolve distinct forms of trace elements. The extractive solution, for example, can dissolve less of the target fraction and more than another not wished fraction. The goal of this work is to compare the extraction of native iron with three sequential extraction methods of the heavy metals, using three soils with different physical chemistry characteristics: a histosol, an oxisol, and a mollisol. The results obtained in this work demonstrate that a smaller relation soil/extractor results in a larger extraction in almost all phases. The use of many stages of the sequential extraction, with the purpose of more association of the metal with different components of the soil, can result, among other things, in modification of the substratum by the action of the reagents used, besides reducing the selectivity of the more specific extractors. Readsorption and redistribution of the heavy metals could have happened with larger intensity in the fraction where hidroxilamine was used with higher temperature. Sequential extraction of iron, without enrichment of soil samples, in the respective fractions in each method, it was important to better understand the behavior of the reagents considered specific to each form of the metal in soil.Keywords: sequential extraction; readsorption and redistribution; heavy metals. INTRODUÇÃOUma das ferramentas para se avaliar o comportamento dos metais traços no solo é a utilização dos chamados métodos de extração seqüencial. Conceitualmente, os metais (ou elementos) contidos em um material sólido podem ser fracionados em formas geoquímicas específicas, e podem ser seletivamente extraídos pelo uso de reagentes apropriados. Cada método apresenta um conjunto de reagentes que deve atacar especificamente a forma geoquímica para o qual foi escolhido 1 . Na literatura pode-se encontrar muitos trabalhos envolvendo vári-os métodos de extração seqüencial 2,3 , porém poucos são aqueles em que há um estudo de comparação entre eles [4][5][6][7][8][9] , o que é decorrente das diferentes condições físico-químicas dos extratores utilizados, as quais acabam afetando diretamente no resultado final da análise das diferentes frações obtidas. A maioria dos trabalhos sobre extração seqüencial em solos e sedimentos utiliza os métodos como se eles fossem por si só absolutos, desconsiderando as diversas interferências que possam existir 10 . Nenhum esquema de fracionamento é totalmente efetivo para dissolver formas geoquímicas distintas dos elementos no material só-lido 11 . Uma solução extratora, por exemplo, poderá dissolver menos a fração alvo (elemento ou metal na forma geoquímica específica) e mais de uma outra forma geoquímica não desejada. Esta falta de seletividade dos extratores é um dos principais responsáveis pela baixa eficiência dos métodos [12][13][14][15] . O primeiro problema ao se criar um esquema de extração para metais traços é selecionar reagentes que sejam efetivos e seletivos em solubilizar uma forma específica do elemento ou metal no solo 11 . Durante as diversas etapas de extr...

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Application of a new fractionation scheme for heavy metals in soils

Cited by 58 publications

References 15 publications

Chemical Fractions of Iron and Manganese with Different Physico-Chemical Properties in Polyhouse Soils of Himachal Pradesh, India

Chemical Fractions of Iron and Manganese with Different Physico-Chemical Properties in Polyhouse Soils of Himachal Pradesh, India

Comparison of two sequential extraction procedures for the fractionation of zinc in agricultural calcareous soils

Avaliação dos métodos de extração sequencial de Tessier, Keller e Miller na determinação de ferro nativo em três tipos de solos: orgânico, brunizem e latossolo

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