Is there a future for sequential chemical extraction?

Bacon, Jeffrey R.; Davidson, Christine M.

doi:10.1039/b711896a

Cited by 554 publications

(343 citation statements)

References 510 publications

(480 reference statements)

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confidence: 99%

“…However, the chemistry of mercury requires the development of specific extraction schemes, specifically dedicated to this element (Bacon and Davidson, 2008). Difficulties in the comparison of sequential extraction results for mercury fractionation relate particularly to inconsistencies between different extraction protocols (Bacon and Davidson, 2008). It must be underlined that a limitation to the use of sequential extraction procedures in general is the lack of validation and reference materials for checking the performance both of method and the laboratory.…”

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confidence: 99%

“…It must be underlined that a limitation to the use of sequential extraction procedures in general is the lack of validation and reference materials for checking the performance both of method and the laboratory. Bacon and Davidson (2008) provided a comprehensive critical review on sequential extraction procedures, considering its limitations such as the lack of selectivity, the non-specificity and re-adsorption. The use of the remaining soil matrix for the next step may have influence on further steps of chemical extraction, since substrate composition has been altered.…”

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Extractability and mobility of mercury from agricultural soils surrounding industrial and mining contaminated areas

et al. 2010

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This version is available at https://strathprints.strath.ac.uk/27622/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge. AbstractThis study focussed on a comparison of the extractability of mercury in soils with two different contamination sources (a chlor-alkali plant and mining activities) and on the evaluation of the influence of specific soil properties on the behaviour of the contaminant.The method applied here did not target the identification of individual species, but instead provided information concerning the mobility of mercury species in soil. Mercury fractions were classified as mobile, semi-mobile and non-mobile.The fractionation study revealed that in all samples mercury was mainly present in the semi-mobile phase (between 63 and 97%). The highest mercury mobility (2.7 mg kg -1 ) was found in soils from the industrial area. Mining soils exhibited higher percentage of non-mobile mercury, up to 35%, due to their elevated sulfur content.Results of factor analysis indicate that the presence of mercury in the mobile phase could be related to manganese and aluminum soil contents. A positive relation between mercury in the semi-mobile fraction and the aluminium content was also observed. By contrary, organic matter and sulfur contents contributed to mercury retention in the soil matrix reducing the mobility of the metal.

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Extractability and mobility of mercury from agricultural soils surrounding industrial and mining contaminated areas

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“…As the fraction extracted from SPM and sediment is operationally defined and because bioavailability towards different invertebrate species is highly complex, some authors criticized the sequential extraction approach (Bacon and Davidson, 2008). As our objective was a general characterization of trace metal distribution and partitioning, this approach allowed comparing sites.…”

Section: Trace Metal Spatial Distribution and Partitioningmentioning

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Lateral and longitudinal patterns of water physico-chemistry and trace metal distribution and partitioning in a large river floodplain

Peter

Castella

2017

Science of The Total Environment

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• Distribution of trace metals in different floodplain water bodies is not well known.• Water, sediment, SPM and invertebrates from different types of water bodies were analyzed.• Trace metal partitioning varied between connected and disconnected sites.• Lateral gradient was more important than the longitudinal gradient.• Observed differences need to be considered in floodplain management. Floodplain water bodies provide habitat to diversified ecological communities. Floodplains are also among the most impacted aquatic ecosystems. While the link between the lateral connectivity of floodplain sites to the main channel and their plant, fish and invertebrate communities has been well established, detailed information on chemical characteristics and particularly on trace metal spatial distribution and partitioning is scarce. The aim of this study was to examine the link between the lateral connectivity and physico-chemical variables, their trace metal concentrations and partitioning as well as the upstream-downstream gradient of these parameters. In connected and disconnected water bodies of the Rhône River upstream and downstream of the city of Lyon, we measured major ions, dissolved organic carbon, trace metal concentrations (Al, Cr, Ni, Cu, Zn, Cd, Pb and U) in water, suspended particulate matter (SPM) and sediment. The results revealed a clear difference between connected and disconnected water bodies. pH, SPM, Na + , and NO 3 − concentrations were lower in disconnected sites while conductivity, DOC, Ca 2+ and Mg 2+ were higher. Conductivity and a part of the major ion concentrations increased in the downstream sections. Trace metal concentrations and partitioning varied between connected and disconnected sites. In the dissolved fraction, trace metal concentrations were higher in connected sites. In the surface sediment, concentrations were higher in disconnected sites for the majority of metals. The upstream-downstream gradient was less important than the connected-disconnected gradient. Only three metals in the dissolved fraction (Cu, Cd and Pb) showed a clear increase in downstream sections. Overall, the study shows that the functioning of floodplains produces strong spatial patterns concerning the concentrations and partitioning of trace metals. These findings improve our understanding of trace metal biogeochemistry in floodplains and have important applications for floodplain restoration projects. © 2017 Elsevier B.V. All rights reserved. G R A P H I C A L A B S T R A C T a b s t r a c t a r t i c l e i n f o

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“…Data from such analysis are used to compute mobility and bioavailability of metals [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Speciation of Metals and Risk Assessment in Selected Food Crop Samples Grown in Ohaji/Egbema LGA, Imo State, Nigeria

Wirnkor¹,

Ngozi²,

Obinna³

et al. 2017

J Environ Anal Chem

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Ohaji Egbema is known for its oil production and exploration activities and so crops grown in this area could be contaminated. Chemical speciation was carried out on four commonly grown food crops in the area so as to determine the level of metal contamination. The samples were analyzed sequentially and the metal species in the extract determined by ASS. Results revealed that mean concentrations of all studied metals to fall within the WHO/FAO permissible limits. Significant bioavailability was observed for Pb in Okoro (0.67) and Orange (0.7). Zn showed the highest concentration and its bioavailability was highest for Okoro (12.6)>Pawpaw (7.9)>Orange (5.5)>Cassava (0.28). The sum of EDI for both adult and children exhibited similar trend with Cassava having the least value in both adult and children. Though metals showed low values of EDI, excessive consumption can have adverse effect in humans due to bioaccumulation in living system. Hazard Quotient (HQ) was highest for Pb (3.524) in Pawpaw for children while Fe (0.705) was highest in Pawpaw for adult. Generally, HQ was found to be highest in children for all the metals indicating great health risk for children. Risk associated with consuming these four fruit crops in terms of summation of RAC revealed the order of decrease to be: Okoro (1620)>Pawpaw (1021)>Orange (861)>Cassava (178). This study has shown that the consumption of these fruit crops could be a great health risk for children.

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Is there a future for sequential chemical extraction?

Cited by 554 publications

References 510 publications

Extractability and mobility of mercury from agricultural soils surrounding industrial and mining contaminated areas

Extractability and mobility of mercury from agricultural soils surrounding industrial and mining contaminated areas

Lateral and longitudinal patterns of water physico-chemistry and trace metal distribution and partitioning in a large river floodplain

Speciation of Metals and Risk Assessment in Selected Food Crop Samples Grown in Ohaji/Egbema LGA, Imo State, Nigeria

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