Chemical Speciation in Soils and Related Materials by Selective Chemical Extraction

Ure, A.M.; Davidson, Christine M.

doi:10.1002/9780470988312.ch10

Cited by 57 publications

(52 citation statements)

References 202 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Some comprehensive reviews have been written on the widespread use of sequential extraction schemes, their application, harmonization, validation, etc. (for example [4,82,83]). Recent research attention has emphasized harmonization and development of a standardized three-step BCR sequential extraction procedure [3,4,62].…”

Section: Standardization Of Sequential Extraction Proceduresmentioning

confidence: 99%

Analysis and Fractionation of Trace Elements in Soils

Laing

2010

Trace Elements in Soils

View full text Add to dashboard Cite

Section: Standardization Of Sequential Extraction Proceduresmentioning

confidence: 99%

Analysis and Fractionation of Trace Elements in Soils

Laing

2010

Trace Elements in Soils

View full text Add to dashboard Cite

“…It is generally accepted that pH and bile type used in in vitro test are major factors affecting the bioaccessibility of Cd in soils (Oomen et al, 2002(Oomen et al, , 2004, but this has not been tested on wide range of soils. Sequential chemical extraction is a well-established approach for the fractionation of trace metals in soils by using a series of progressively harsher reagents to dissolve increasingly refractory forms (Ure and Davidson, 2002). Although some inherent limitations caused by the non-selectivity of reagents and possible re-adsorption of metals during extraction have been reported (Nirel and Morel, 1990;Kim and Fergusson, 1991), it has been found that plant uptake and toxicity can be related to specific fractions of sequential extraction procedure (Woolson et al, 1971;Chlopecka and Adriano, 1996;Guo and Yost, 1998;Krishnamurti and Naidu, 2000).…”

Section: Introductionmentioning

confidence: 99%

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

146

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

“…It is the chemical form that determines the mobility and bioavailability of the soil metals to other environmental compartments (such as water and biota) when physicochemical conditions are favorable (Gleyzes et al 2002;Olajire et al 2003;Tack and Verloo 1995;Ure and Davidson 2002). For several decades, sequential extraction techniques have been used as a tool to gain information about the operational speciation of heavy metals in soils and sediments (Rauret et al 1999;Shuman 1985;Tessier et al 1979;Ure et al 1993).…”

mentioning

confidence: 99%

Chemical fractionation of heavy metals in urban soils of Guangzhou, China

Lü

Zhu

Chen

et al. 2007

Environ Monit Assess

131

View full text Add to dashboard Cite

Knowledge of the total concentration of heavy metals is not enough to fully assess the environmental impact of urban soils. For this reason, the determination of metal speciation is important to evaluate their environment and the mobilization capacity. Sequential extraction technique proposed by the former European Community Bureau of Reference (BCR) was used to speciate Cd, Cu, Fe, Mn, Ni, Pb, and Zn in urban soils from Guangzhou into four operationally defined fractions: HOAc extractable, reducible, oxidizable, and residual. The Cu, Fe, Ni, and Zn were predominantly located in the residual fraction, Pb in the reducible fraction, and Cd and Mn within the HOAc extractable fraction. The order of Cd in each fraction was generally HOAc extractable > reducible > residual > oxidizable; Cu and Fe were residual > reducible > oxidizable > HOAc extractable; Mn was HOAc extractable > residual > reducible > oxidizable; Ni and Zn were residual > reducible > HOAc extractable > oxidizable; and Pb was reducible > residual > oxidizable > HOAc extractable. Cadmium was identified as being the most mobile of the elements, followed by Mn, Zn, Ni, Cu, Pb and Fe. Iron-Mn oxides can play an important role in binding Cd, Cu, Ni, Pb, and Zn and in decreasing their proportion associated with the residual fraction in the soils. With total concentrations of Cd, Cu, Ni, Pb, Zn, and Mn increase, these metals more easily release and may produce more negative effects on the urban environment.

show abstract

Chemical Speciation in Soils and Related Materials by Selective Chemical Extraction

Cited by 57 publications

References 202 publications

Analysis and Fractionation of Trace Elements in Soils

Analysis and Fractionation of Trace Elements in Soils

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

Chemical fractionation of heavy metals in urban soils of Guangzhou, China

Contact Info

Product

Resources

About