Continuous-flow system for reduction of metal readsorption during sequential extraction of soil

Chomchoei, Roongrat; Shiowatana, Juwadee; Pongsakul, P.

doi:10.1016/s0003-2670(02)01000-0

Cited by 61 publications

(32 citation statements)

References 16 publications

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“…To make sequential extraction procedures less time-consuming and labour-intensive, ultrasound-assisted [94] or microwave-assisted procedures [95], as well as dynamic, flow-through approaches [96][97][98][99][100][101] have recently been developed. When using a continuous-flow sequential extraction procedure (Figure 4.2), not only fractional distribution data for evaluation of the mobility or potential environmental impact of the trace elements are generated, but also extraction profiles (extractograms) which can be used to study elemental association and to demonstrate the degree of anthropogenic contamination [102].…”

Section: Disadvantages Of the Current Procedures And Recent Developmentsmentioning

confidence: 99%

Analysis and Fractionation of Trace Elements in Soils

Laing

2010

Trace Elements in Soils

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Section: Disadvantages Of the Current Procedures And Recent Developmentsmentioning

confidence: 99%

Analysis and Fractionation of Trace Elements in Soils

Laing

2010

Trace Elements in Soils

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“…In contrast to C DGT and C sol , the bioavailable concentrations of Cd with three extraction methods decreased at a slow pace. This phenomenon may be related to the redistribution and readsorption of metals during the extraction process (Chomchoei et al 2002). Moreover, the stronger binding intensity of organic matter to Cd may be also possible to be responsible for the slower extraction quantity.…”

Section: Bioavailable CD Reflected By Traditional Extraction Measurementmentioning

confidence: 99%

“…Among them, traditional extraction methods, soil solution concentration and DGT have been widely used to determine the bioavailability of metals in soils to plants. Traditional extraction methods were based on the equilibrium distribution of metals between the soil solid phase and the solution, and it was hard to overcome the redistribution and readsorption of metals during the extraction process (Chomchoei et al 2002). Soil solution concentration of metals may include unavailable fractions to plants (Luo et al 2001;Lombi et al 2003;Zhang et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of organic amendment on the effect of cadmium bioavailability in contaminated soils using the DGT technique and traditional methods

Yao

Sun

Wang

et al. 2015

Environ Sci Pollut Res

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Organic amendments have been widely proposed as a remediation technology for metal-contaminated soils, but there exist controversial results on their effectiveness. In this study, the effect of pig manure addition on cadmium (Cd) bioavailability in Cd-contaminated soils was systematically evaluated by one dynamic, in situ technique of diffusive gradients in thin films (DGT) and four traditional methods based on the equilibrium theory (soil solution concentration and the three commonly used extractants, i.e., acetic acid (HAc), ethylenediamine tetraacetic acid (EDTA), and calcium chloride (CaCl). Wheat and maize were selected for measurement of plant Cd uptake. The results showed that pig manure addition could promote the growth of two plants, accompanied by increasing biomasses of shoots and roots with increasing doses of pig manure addition. Correspondingly, increasing additions of pig manure reduced plant Cd uptake and accumulation, as indicated by the decreases of Cd concentrations in shoots and roots. The bioavailable concentrations of Cd in Cd-contaminated soils reflected by the DGT technique obviously decreased with increasing doses of pig manure addition, following the same changing trend as plant Cd uptake. Changes in soil solution Cd concentration and extractable Cd by HAc, EDTA, and CaCl in soils were similar to DGT measurement. Meanwhile, the capability of Cd resupply from solid phase to soil solution decreased with increasing additions of pig manure, as reflected by the decreases in the ratio (R) value of C to C. Positive correlations were observed between various bioavailable indicators of Cd in soils and Cd concentrations in the tissues of the two plants. These findings provide stronger evidence that pig manure amendment is effective in reducing Cd mobility and bioavailability in soils and it is an ideal organic material for remediation of Cd-contaminated soils.

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“…The techniques use a succession of chemical reagents that sequentially extract various targets phases in the sample. The results are useful for obtaining information about origin, mode of occurrence, bioavailability, potential mobility, and transport of elements in natural environments (Ure and Davidson 2002;Chomchoei et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Comparison of unmodified and modified BCR sequential extraction schemes for the fractionation of heavy metals in shrimp aquaculture sludge from Selangor, Malaysia

Nemati

Bakar

Abas

et al. 2010

Environ Monit Assess

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A study was carried out to investigate the fractionation of Cd, Cr, Cu, Fe, Mn, Pb, and Zn in shrimp aquaculture sludge from Selangor, Malaysia, using original (unmodified) and modified four-steps BCR (European Community Bureau of Reference, now known as the Standards Measurements and Testing Program) sequential extraction scheme. Step 2 of the unmodified BCR procedure (subsequently called Method A) involves treatment with 0.1 M hydroxylammonium chloride at pH 2, whereas 0.5 M hydroxylammonium chloride at pH 1.5 was used in the modified BCR procedure (subsequently called Method B). Metal analyses were carried out by flame atomic absorption spectrometry. A pseudo-total aqua-regia digest of BCR CRM 701 has also been undertaken for quality assurance purposes. The recovery of Method A for all metals studied ranges from 96.14% to 105.26%, while the recovery for Method B ranges from 95.94% to 122.40%. Our results reveal that Method A underestimated the proportion of metals bound to the easily reducible fraction except for copper. Therefore, the potential mobility of these elements is higher than others. Thus, to use this sludge as a fertilizer we have to first find a remediation for reduction of heavy metal contamination.

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Continuous-flow system for reduction of metal readsorption during sequential extraction of soil

Cited by 61 publications

References 16 publications

Analysis and Fractionation of Trace Elements in Soils

Analysis and Fractionation of Trace Elements in Soils

Evaluation of organic amendment on the effect of cadmium bioavailability in contaminated soils using the DGT technique and traditional methods

Comparison of unmodified and modified BCR sequential extraction schemes for the fractionation of heavy metals in shrimp aquaculture sludge from Selangor, Malaysia

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