Use of the modified BCR three-step sequential extraction procedure for the study of trace element dynamics in contaminated soils

Pueyo, Marta Venceslao; Mateu, Javier; Rigol, Anna; Vidal, Miquel; López-Sánchez, José Fermı́n; Rauret, G.

doi:10.1016/j.envpol.2007.06.020

Cited by 329 publications

(133 citation statements)

References 60 publications

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“…In all cases, no important differences were observed in the distribution of Pb between these fractions as a function of alternating redox conditions. Pueyo et al 45 also found Pb partitioned mainly in the reducible and residual fractions with little change in their distribution as a function of time. The significant Pb contents in the labile reducible fraction (about 40-50% of the total content) suggest that important amounts of this metal can be potentially released into the environment from soils subject to alternating redox conditions.…”

Section: Bcr Sequential Extractionmentioning

confidence: 98%

Leaching potential of metallic elements from contaminated soils under anoxia

Balint

Nechifor

Ajmone-Marsan

2014

Environ. Sci.: Processes Impacts

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Environmental ImpactThe higher frequency and intensity of extreme rainfall events, as well as the variations in precipitation patterns and intensities as a result of climate change may cause important shifts in soil hydrological regime. This could expose contaminated soils to significant variations in redox potentials possibly influencing metallic element behaviour and their potential transfer to other environmental compartments. This study shows that alternating soil redox conditions may enhance the release and redistribution of metals in more labile fractions. In particular, the presence of redox-sensitive minerals, such as chalcopyrite, in soils affected by mine tailings, could release significant amounts of Cu due to the alternating redox conditions and therefore have important environmental implications. Graphical abstractThe alternation of redox cycles may play a higher role in the release, leaching and redistribution of metallic elements from contaminated soils with respect to oxidizing and reducing conditions alone. AbstractUnderstanding metallic element (ME) behaviour in soils subjected to alternating redox conditions is of significant environmental importance, particularly for contaminated soils. Although variations in the hydrological status of soils may lead to the release of ME, redox-driven changes in ME dynamics are still not sufficiently understood. We studied the effects of alternating redox cycles 2 on the release, leaching and redistribution of Zn, Cu and Pb in metal mine-contaminated and noncontaminated soils by means of a column experiment. Although the release of Zn was promoted by the onset of reductive conditions, successive redox cycles favoured metal partitioning in less labile fractions limiting its further mobilization. The release of Cu in soil porewaters and redistribution in the solid phase towards more labile pools were strongly dependent on the alternation between oxidizing and reducing conditions. In contaminated soils, the presence of chalcopyrite could have determined the release of Cu under oxic conditions and its relative immobilization under subsequent anoxic conditions. The behaviour of Pb did not seem to be influence by redox status, although higher concentrations in the column leachates with respect to soil porewaters suggested that alternating redox conditions could nonetheless result in substantial mobilization. This study provides evidence that the alternation of soil redox conditions may play a more important role in determining the release and leaching of metallic elements from soils with respect to reducing or oxidizing conditions considered separately.

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Section: Bcr Sequential Extractionmentioning

confidence: 98%

Leaching potential of metallic elements from contaminated soils under anoxia

Balint

Nechifor

Ajmone-Marsan

2014

Environ. Sci.: Processes Impacts

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“…The chemical partitioning of metals in sediments was studied by following the modified BCR (mBCR) sequential extraction scheme (Figure 3). The details of the procedure are described elsewhere (Pueyo et al, 2008). The accuracy of the methods employed for the determination of total metal content in water and sediments and different fractions of metals as per the mBCR scheme was assured by analysing the certified reference materials (CRMs).…”

Section: Sample Collection and Analysismentioning

confidence: 99%

Trace metal fractionation in water and sediments of an urban river stretch

Kumar

Rani

Gupta

et al. 2014

Chemical Speciation & Bioavailability

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In this study, the fractionation and ecotoxic potential of Cr, Ni, Cu and Pb in water and sediments of the river Yamuna (Delhi stretch) is presented. The river water is used for various purposes such as irrigation, industrial, domestic and drinking. The investigations suggest that the availability of metals in water follows the sequence Ni>Cr>Pb>Cu whereas a different pattern (Pb>Cu>Ni>Cr) is observed in sediments. Statistically significant spatial variations are indicated by two-way ANOVA in different geochemical forms of the metals and physicochemical parameters of water and sediments of the river Yamuna. Principal component analysis (PCA) suggests a similar source for all four metals probably from the sewage from municipal drains. PCA also indicates some independent sources of Cu and Pb. The hot spots were identified using hierarchical cluster analysis considering bioavailable forms of the metals in water and sediments as objects and the sampling sites as variables. Risk assessment code analysis indicates that metals generally pose medium to high risk at different sites. However, at a few locations either Ni or Pb cross the level of very high ecological risk.

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“…Sequential extraction tests have been used widely to investigate metal physico-chemical forms and to study the effects of soil processes and changes in environmental conditions on soil metal availability and mobility. The three-step procedure proposed and modified by the Community Bureau of Reference (BCR) (Ure et al, 1993;Sahuquillo et al, 1999) has been widely accepted as the 'standard method' and its application has increased recently (Pueyo et al, 2008;Anju and Banerjee, 2011). In the present study, single extracts with different extraction abilities (i.e.…”

Section: Introductionmentioning

confidence: 99%

Changes in metal availability, desorption kinetics and speciation in contaminated soils during repeated phytoextraction with the Zn/Cd hyperaccumulator Sedum plumbizincicola

Jia

et al. 2016

Environmental Pollution

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a b s t r a c tPhytoextraction is one of the most promising technologies for the remediation of metal contaminated soils. Changes in soil metal availability during phytoremediation have direct effects on removal efficiency and can also illustrate the interactive mechanisms between hyperaccumulators and metal contaminated soils. In the present study the changes in metal availability, desorption kinetics and speciation in four metal-contaminated soils during repeated phytoextraction by the zinc/cadmium hyperaccumulator Sedum plumbizincicola (S. plumbizincicola) over three years were investigated by chemical extraction and the DGT-induced fluxes in soils (DIFS) model. The available metal fractions (i.e. metal in the soil solution extracted by CaCl 2 and by EDTA) decreased greatly by >84% after phytoextraction in acid soils and the deceases were dramatic at the initial stages of phytoextraction. However, the decreases in metal extractable by CaCl 2 and EDTA in calcareous soils were not significant or quite low. Large decreases in metal desorption rate constants evaluated by DIFS were found in calcareous soils. Sequential extraction indicated that the acid-soluble metal fraction was easily removed by S. plumbizincicola from acid soils but not from calcareous soils. Reducible and oxidisable metal fractions showed discernible decreases in acid and calcareous soils, indicating that S. plumbizincicola can mobilize non-labile metal for uptake but the residual metal cannot be removed. The results indicate that phytoextraction significantly decreases metal availability by reducing metal pool sizes and/or desorption rates and that S. plumbizincicola plays an important role in the mobilization of less active metal fractions during repeated phytoextraction.

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Use of the modified BCR three-step sequential extraction procedure for the study of trace element dynamics in contaminated soils

Cited by 329 publications

References 60 publications

Leaching potential of metallic elements from contaminated soils under anoxia

Leaching potential of metallic elements from contaminated soils under anoxia

Trace metal fractionation in water and sediments of an urban river stretch

Changes in metal availability, desorption kinetics and speciation in contaminated soils during repeated phytoextraction with the Zn/Cd hyperaccumulator Sedum plumbizincicola

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