Concentrations of Selected Heavy Metals in Benthic Diatoms and Sediment in the Westerschelde Estuary

Absil, M. C. P.; Scheppingen, Y. van

doi:10.1007/s001289900145

Cited by 19 publications

(11 citation statements)

References 13 publications

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“…The second study shows greater agreement with results reported here, where a BCF sed range of 3.0–71 across all time points when sediment was the initially contaminated component was observed. Previously reported BCF sed may differ from those in the current study because the two cited studies (Stronkhorst et al ; Absil and van Scheppingen ) were conducted in the field, where uptake is likely to be affected by the very different and variable environmental conditions. In particular, there is no exchange of water during the laboratory experiment and the volume of water relative to the volume of sediment is much smaller than in the field.…”

Section: Discussioncontrasting

confidence: 73%

“…A pilot study, carried out in the Scheldt estuary (Stronkhorst et al ), found a BCF sed for Cd in diatoms of 0.01–0.30 for sediment with a mean dry weight (DW) Cd concentration of 5.24 ± 3.31 mg kg −1 DW, which indicates no bioconcentration. However, a follow up study (Absil and van Scheppingen ) in the Westerschelde estuary found BCF sed ranging from 0.01 to 16.3 for sediment with a Cd concentrations ranging from 0.08 to 7.9 mg kg −1 DW, with higher concentration factors occurring at sites with sediment Cd concentrations < 1.5 mg kg −1 . The second study shows greater agreement with results reported here, where a BCF sed range of 3.0–71 across all time points when sediment was the initially contaminated component was observed.…”

Section: Discussionmentioning

confidence: 98%

“…Phytoplanktonic microalgae are well studied with respect to contaminant uptake from water (Heldal et al 2001;Lee and Fisher 2016); however, there has been very little research to date involving the algae of the microphytobenthos (Stronkhorst et al 1994). In particular, although it has long been suggested that algae may play a significant role in mobilizing sediment bound metals (Laube et al 1979), there has been a dearth of research involving the uptake of contaminants from sediment to microphytobenthic algae (Stronkhorst et al 1994;Absil and van Scheppingen 1996).…”

mentioning

confidence: 99%

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Cadmium uptake from sediment by Cylindrotheca closterium and the effect of diatom presence on partitioning of cadmium between sediment and water: A laboratory study

Becker

Copplestone

2019

Limnology & Oceanography

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Although it is well established that microalgae take up metals and other contaminants from water and it has been suggested that algae may play a significant role in mobilizing sediment bound contaminants, there has been little research on the uptake of sediment‐associated contaminants by microalgae. This may be important for microphytobenthos, which is closely associated with sediments. We report on laboratory experiments investigating the uptake of cadmium (Cd) from sediment and water by Cylindrotheca closterium over 96 h. The role of microalgae in the partitioning of Cd between sediment and water was also investigated. While concentrations do not typically represent those in the natural environment, we showed C. closterium takes up Cd from sediment, and concentration in microalgae is affected by sediment organic matter content. Cylindrotheca closterium influenced Cd movement between sediment and water: transfer from water to sediment was slowed, while transfer from sediment to overlying water (all treatments) and interstitial water (unprocessed sediment treatments) was increased. This is the first article to describe Cd uptake by diatoms from intertidal sediment in relation to sediment properties and mobilization of Cd from sediment in the presence of diatoms. Microalgae may serve as a pathway for sediment‐associated metals to enter into aquatic food webs, and their presence appears to increase metal concentrations in water potentially making any mobilized metals available for uptake by other species. Given this and their importance as the basis of the food chain, there may be implications for environmental and human health and potential impacts for the biological stability of the sediment.

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Section: Discussioncontrasting

confidence: 73%

Section: Discussionmentioning

confidence: 98%

mentioning

confidence: 99%

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Cadmium uptake from sediment by Cylindrotheca closterium and the effect of diatom presence on partitioning of cadmium between sediment and water: A laboratory study

Becker

Copplestone

2019

Limnology & Oceanography

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“…2f). However, it can be concluded that these levels are not very alarming in comparison with those found by AcevedoFigueroa et al (2006) in the lagoon of San José (219 mg kg −1 ) and in sediments of the Westerschelde estuary in Belgium (132 mg kg −1 ; Absil and Van Scheppingenn 1996) or in surface sediments of the Gulf of Suez (73.9 mg kg −1 ; Khaled et al 2006).…”

Section: Heavy Metal Distribution In Sedimentsmentioning

confidence: 44%

Evaluation of metal contamination in sediments from north of Morocco: geochemical and statistical approaches

Rodríguez-Barroso

Benhamou

Moumni

et al. 2008

Environ Monit Assess

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Concentrations of Fe, Mn, Cr, Cu, Ni, Pb, Zn, Cd and Hg were evaluated in surface sediments of two rivers from north of Morocco, known as Souani and Mghogha rivers. Significantly higher concentrations in mg kg(-1) dry weight (dw) of Mn (747.6 vs. 392.9), Cr (86.4 vs. 56.3), Zn (299.5 vs. 138.5) were found in sediment samples from Mghogha when compared with Souani river. Average concentrations of Cd and Hg in several sediment samples from both rivers were above the effect range median that predicts toxic effects to aquatic organisms. The calculation of enrichment factors showed that Mn, Cr, Cu and Ni were depleted, whereas Pb and Hg were enriched. The results of geoaccumulation index revealed that sediments of both rivers were unpolluted with most of the metals and moderately contaminated with Fe and Hg. Some of elevated concentrations of Hg, principally in Mghogha River, were due to anthropogenic sources including the direct discharges of industrial zone.

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“…Some species of planktonic and benthic diatoms concentrate heavy metals and radio-isotopes by non-specific bioaccumulation, etc. (Absil and van Scheppingen, 1996). Adam and Garnier-Laplace (2003) Mn) by the diatom Cyclotella meneghiana and the chlorophyte Scenedesmus obliquus.…”

Section: Bioremediation By Diatoms and Cyanobacteriamentioning

confidence: 99%

Psychrophilic and Psychrotolerant Microbial Extremophiles in Polar Environments

Pikuta¹,

Hoover²

2009

Polar Microbiology

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Concentrations of Selected Heavy Metals in Benthic Diatoms and Sediment in the Westerschelde Estuary

Cited by 19 publications

References 13 publications

Cadmium uptake from sediment by Cylindrotheca closterium and the effect of diatom presence on partitioning of cadmium between sediment and water: A laboratory study

Cadmium uptake from sediment by Cylindrotheca closterium and the effect of diatom presence on partitioning of cadmium between sediment and water: A laboratory study

Evaluation of metal contamination in sediments from north of Morocco: geochemical and statistical approaches

Psychrophilic and Psychrotolerant Microbial Extremophiles in Polar Environments

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