Transformations of heavy metals added to soil — application of a new sequential extraction procedure

Ying, Ma; Uren, N. C.

doi:10.1016/s0016-7061(97)00126-2

Cited by 133 publications

(94 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Residual (33.4%), specifically absorbed (23.7%), organic-bound (13.7%) fractions were found to be the main Cd forms in some unpolluted surface soils of southern Australia (Krishnamurti and Naidu, 2000). In an artificially polluted Mollisol, the exchangeable (48%), EDTA-extractable (26%), and residual fractions (21%) were reported to be the dominant Cd forms (Ma and Uren, 1998). An order of residual N exchangeable N carbonate N Fe/Mn oxide N organic N water-soluble fraction of Cd was observed in contaminated soils from various US locations (Ma and Rao, 1997).…”

Section: Comparison Of CD Fractionation Of Unpolluted and Cd-spiked Smentioning

confidence: 96%

“…There are a number of previous reports in the literature characterizing Cd fractionation in unpolluted and polluted soils using various sequential extraction procedures (Mann and Ritchie, 1994;Ma and Rao, 1997;Ma and Uren, 1998;Ahnstrom and Parker, 1999;Petit and Rucandio, 1999;Száková et al, 1999;Naidu, 2000, 2003). It was reported that concentrated acid-extractable Cd was the only fraction of indigenous Cd detected in the yellow earth and lateritic podzolic soil collected from Western Australia, using graphite furnace atomic absorption spectrophotometer (GFAAS).…”

Section: Comparison Of CD Fractionation Of Unpolluted and Cd-spiked Smentioning

confidence: 99%

“…Sequential extraction techniques have been widely used to examine the physicochemical forms of metals, and thus provide better understanding of the processes affecting the phytoavailability of metals in soils (Ahnstrom and Parker, 1999). Sequential extraction procedures have also been employed to investigate temporal changes of freshly spiked heavy metals in soils (Mann and Ritchie, 1994;Ma and Uren, 1998;Fendorf et al, 2004). The decrease in bioavailability of a metal to a given biological organism with its contact time with soil is often termed "ageing" through specific retention mechanisms.…”

Section: Introductionmentioning

confidence: 99%

“…The decrease in bioavailability of a metal to a given biological organism with its contact time with soil is often termed "ageing" through specific retention mechanisms. A number of mechanisms may be operational in the retention of heavy metals, and the dominant mechanism may vary with the incubation time (Mann and Ritchie, 1994;Ma and Uren, 1998;Fendorf et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The effect of ageing on the bioaccessibility and fractionation of cadmium in some typical soils of China

Tang

Zhu

Cui

et al. 2006

Environment International

147

View full text Add to dashboard Cite

Ingestion of contaminated soil has been recognized as an important exposure pathway of cadmium (Cd) for humans, especially for children through outdoor hand-to-mouth activities. The effect of ageing process following the input of Cd into soil on the bioaccessibility of Cd in five typical soils of China was investigated using physiologically based in vitro test in this study. A sequential extraction procedure was employed with attempt to identify the bioaccessible fraction(s) of Cd in soils. The bioaccessibility of Cd in strongly acidic (≈ pH 4.5) soils reached nearly steady levels (76.5-76.9% and 52.0-52.6% in the gastric and small intestinal phases, respectively) after a sharp decline in the first week of ageing. In contrast, the bioaccessibility of Cd in higher pH (N 6.0) soils was found to be much lower (53.3-72.7% and 29.9-43.4% in gastric and small intestinal phases, respectively) and took 2 weeks of ageing to reach steady levels. The freshly spiked Cd was more labile than native Cd. The main proportion of spiked Cd was found in exchangeable Cd which was higher in strongly acidic soils (68.6-71.8%) than in higher pH soils (53.4-61.4%) at day 120 after a sharp decline to the nearly steady state in the first 1 and 2 weeks, respectively. Significant correlations between Cd bioaccessibility and either water soluble and exchangeable Cd individually, or the sum of water soluble and exchangeable Cd throughout the incubation period for all soils, indicate that these forms of Cd are likely to constitute the main proportion of bioaccessible Cd in soils.

show abstract

Section: Comparison Of CD Fractionation Of Unpolluted and Cd-spiked Smentioning

confidence: 96%

Section: Comparison Of CD Fractionation Of Unpolluted and Cd-spiked Smentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The effect of ageing on the bioaccessibility and fractionation of cadmium in some typical soils of China

Tang

Zhu

Cui

et al. 2006

Environment International

147

View full text Add to dashboard Cite

show abstract

“…Várias modificações foram feitas nesta metodologia nos últimos anos, como a extração seqüencial para a remoção de metais pesados especificamente adsorvidos na fração facilmente redutível de óxidos de Mn 16 , a extração em três estágios para a determinação de metais pesados em sedimentos 17 , etc.…”

Section: Introductionunclassified

Determinação de cobre, alumínio e ferro em solos derivados do basalto através de extrações seqüenciais

Costa¹,

Almeida²,

Lenzi³

et al. 2002

Quím. Nova

View full text Add to dashboard Cite

Recebido em 24/4/01; aceito em 14/11/01 DETERMINATION OF COPPER, ALUMINUM, AND IRON IN BASALTIC SOILS BY SEQUENTIAL EXTRACTIONS. Copper, aluminum and iron concentrations were determined in four geochemical fractions of three different basaltic soils from the northwest region of the Parana State, Brazil. The fractions examined were the reducible manganese dioxide and amorphous iron oxide, crystaline iron oxide, organic and residual. Metal concentrations were determined in the extracts by flame atomic absorption spectrophotometry. High Fe concentrations were extracted from the crystalline iron oxide (>20%), as well as the amorphous iron oxide (>12%). Copper was extracted from the amorphous and crystalline iron oxides in the range 5 to 12%, but low concentrations were bound to organic matter. Low concentrations of aluminum were extracted (<8%) from the amorphous and crystaline iron oxides, and organic matter. High concentrations of aluminum were found in the residual fraction.Keywords: sequential extractions; basaltic soils; atomic absorption spectrophotometry. INTRODUÇÃOOs minerais da fração argila no solo são os responsáveis pela retenção e distribuição da água, nutrientes, calor e gases. Em solos tropicais, a mineralogia é relativamente simples, sendo constituídos principalmente de caulinita, óxidos de ferro (hematita, goetita e maghemita), óxidos de alumínio (gibbsita) e menores proporções de minerais do tipo 2:1 (vermiculita). Nos óxidos de ferro, alumínio e manganês e, nas periferias das argilas silicatadas, as adsorções de íons metálicos podem ocorrer por meio da formação de ligações covalentes ou eletrostáticas com os grupos funcionais da superfície dos óxidos 1 . Nos argilominerais expansivos, os grupos funcionais estão presentes nos espaços octaédricos das estruturas cristalinas e, nestes sítios, supõem-se que alguns metais sejam fortemente adsorvidos como complexos de esfera interna 2, 3 .Os óxidos de Fe possuem grande poder de pigmentação, determinando assim a coloração de muitos solos. A capacidade de adsorção de metais por esses óxidos é proporcional aos valores de pH. A goetita e hematita adsorvem preferencialmente os metais na seguinte ordem: Cu>Pb>Zn>Cd>Co>Ni>Mn, com a troca de posições do Cu e Pb na hematita 1 . Em geral, os fatores mais importantes que influenciam a adsorção seletiva dos cátions em soluções são o pH, valência, raio iônico e o ponto de carga zero (PCZ) do sólido 4 .O cobre, em virtude de suas propriedades de condutividade, maleabilidade e ductibilidade, pode ser encontrado na composição de vários pigmentos, pesticidas e corantes, entre outros. É indispensável para o desenvolvimento de plantas superiores, sendo classificado como micronutriente e atua praticamente em todas as suas vias metabólicas. Em concentrações elevadas na fase trocável do solo, observam-se efeitos tóxicos nos tecidos vegetais das plantas 5 . A dinâmica do cobre em solos é complexa, sendo afetada por inúmeros fatores entre os quais a composição química, física, mineralógica, a quantidade de matéria orgânica e pH...

show abstract

Cadmium fractions in an acid sandy soil and Cd in soil solution as affected by plant growth

Stritsis

Steingrobe

Claassen

2014

J. Plant Nutr. Soil Sci.

View full text Add to dashboard Cite

In a previous experiment, plants were able to immobilize or solubilize Cadmium (Cd) in a sandy acid soil enriched with 40 μmol Cd kg–1, because Cd solution concentration was decreased by maize (Zea mays) and sunflower (Helianthus annuus), and increased by flax (Linum usitatissimum L. ssp. usitatissimum) and spinach (Spinacia oleracea). It is assumed that the equilibrium with Cd fractions in the soil solid phase and the chemical form of Cd in the soil solution were affected. In the present study, the effect of the four plant species mentioned above on Cd binding in soil was investigated by means of a fractionation of soil Cd with a sequential extraction of seven steps. The seven fractions of Cd are operationally defined by the extraction sequence that follows the order of increasing acidity with extractants of different complexing and redox properties. In the unplanted soil, Cd was predominantly present in the exchangeable Fraction I (F. I) and easily mobilizable Fraction II (F. II) (64%). Significant concentrations of Cd were found in F. III (occluded in Mn oxides; 22%) and F. IV (organically bound; 10%). Fractions V (occluded in poorly crystalline Fe oxides), F. VI (occluded in well crystallized Fe oxides), and F. VII (residual fraction) amounted to less than 5% of the total soil Cd concentration. The plants changed the binding of Cd in soil in a different manner. All plants decreased F. I, but F. II was increased by maize and spinach, decreased by flax or remained unaffected by sunflower. Fraction III was not affected by maize and flax, but decreased by sunflower and spinach, and F. IV was not affected by sunflower and spinach, but was increased by maize and flax. These changes of Cd fractions were not related to the changes the plants had caused in total Cd or Cd2+ concentration of the soil solution. These results show that plant species differ in how they affect Cd binding to the soil solid phase, but this effect is not related to how they affect Cd in soil solution. The mechanisms by which plants affect the relationship between the soil solid and liquid phase are still unclear.

show abstract

Transformations of heavy metals added to soil — application of a new sequential extraction procedure

Cited by 133 publications

References 23 publications

The effect of ageing on the bioaccessibility and fractionation of cadmium in some typical soils of China

The effect of ageing on the bioaccessibility and fractionation of cadmium in some typical soils of China

Determinação de cobre, alumínio e ferro em solos derivados do basalto através de extrações seqüenciais

Cadmium fractions in an acid sandy soil and Cd in soil solution as affected by plant growth

Contact Info

Product

Resources

About