Investigation on trace metal speciation and distribution in the Scheldt estuary

Gaulier, Camille; Zhou, Chun; Gao, Yue; Guo, Wei; Reichstädter, Marek; Ma, Tianhui; Baeyens, Willy; Billon, Gabriel

doi:10.1016/j.scitotenv.2020.143827

Cited by 20 publications

(6 citation statements)

References 85 publications

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“…Nevertheless, it is useful to have an idea about the concentration levels of labile trace metals that can be measured for a fixed time period of deployment. In Table 2 we compare the blank value results of unexposed Chelex resin observed by Garmo et al (2003) with those determined by Zhou and co-workers (Gaulier et al, 2021). The blank values are similar in both studies, except for Mn, Pb, and Ni while the STDs and LODs are similar, except for Co, Pb, and Fe.…”

Section: Transition Metalsmentioning

confidence: 65%

“…Diffusive Gradients in Thin-films devices with different thicknesses of the diffusion domain allow one to provide information on the labile metal fractions at the coastal station and in the offshore area. The ratios of the field to blank concentrations in the Belgian Coastal Zone (BCZ) (Gaulier et al, 2021) are higher than in the Mediterranean Sea except for Cd (Baeyens et al, 2018). All ratios are higher than 8, except for Cd in the BCZ and Fe in the Mediterranean Sea, which are high enough to calculate accurate concentrations.…”

Section: Speciation Results In Marine Water Ecosystemsmentioning

confidence: 99%

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Speciation of Inorganic Compounds in Aquatic Systems Using Diffusive Gradients in Thin-Films: A Review

et al. 2021

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The speciation of trace metals in an aquatic system involves the determination of free ions, complexes (labile and non-labile), colloids, and the total dissolved concentration. In this paper, we review the integrated assessment of free ions and labile metal complexes using Diffusive Gradients in Thin-films (DGT), a dynamic speciation technique. The device consists of a diffusive hydrogel layer made of polyacrylamide, backed by a layer of resin (usually Chelex-100) for all trace metals except for Hg. The best results for Hg speciation are obtained with agarose as hydrogel and a thiol-based resin. The diffusive domain controls the diffusion flux of the metal ions and complexes to the resin, which strongly binds all free ions. By using DGT devices with different thicknesses of the diffusive or resin gels and exploiting expressions derived from kinetic models, one can determine the labile concentrations, mobilities, and labilities of different species of an element in an aquatic system. This procedure has been applied to the determination of the organic pool of trace metals in freshwaters or to the characterization of organic and inorganic complexes in sea waters. The concentrations that are obtained represent time-weighted averages (TWA) over the deployment period.

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Section: Transition Metalsmentioning

confidence: 65%

Section: Speciation Results In Marine Water Ecosystemsmentioning

confidence: 99%

Speciation of Inorganic Compounds in Aquatic Systems Using Diffusive Gradients in Thin-Films: A Review

et al. 2021

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“…3 ( g and h ), ( i and j ) and ( k and l ) respectively. During both seasons, dissolved Ni showed decreasing values close to the sea mouth, which could be because of biological uptake (Gaulier et al 2021 ). Thus, dissolved Ni showed non-conservative behaviour or was unreactive during estuarine mixing.…”

Section: Discussionmentioning

confidence: 99%

“…In general, dissolved Cd showed an increasing tendency towards seaward in all the three estuaries during the post-monsoon period. The constant increase of Cd concentration is likely to be because of desorption from suspended particulate matter (Gaulier et al 2021 ; Bingham et al 1984 ). Regeneration from the degradation of organic matter could also influence the behaviour of dissolved cadmium in estuaries (Windom et al 1991 ).…”

Section: Discussionmentioning

confidence: 99%

Risk assessment and spatio-temporal distribution of dissolved trace metals in Swarna, Sharavati and Kali estuaries, South-West Coast of India

Nishitha

Sudheer

Kumar

et al. 2022

Environ Sci Pollut Res

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Trace metals act as a limiting nutrient and prerequisite for primary productivity in marine environments. The distribution of metals in dissolved phase along the salinity gradients of Swarna, Sharavati and Kali estuaries in southwestern India, during post and pre-monsoon seasons, were studied. We have investigated the behaviour of trace metals in the estuarine environment and their extent of impact on human health and ecosystem. The study revealed, non-conservative behaviour of dissolved Mn, Fe, Ni, Cd and Co in the estuaries. Whereas Cu behaved non-conservatively in post-monsoon and conservatively in pre-monsoon seasons. Risk assessment studies revealed that higher chronic daily intake (CDI) in humans, through dermal pathway, in Swarna and Sharavati estuaries during post-monsoon, whereas it was during pre-monsoon season in the Kali estuary. Hazard Index values for the studied metals in adults and children are below risk thresholds, though children are more prone to health risk through the dermal pathway.

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“…A method that overrules these two drawbacks is the in situ passive sampling technique of Diffusive Gradients in Thin-Films (DGT), which has been yet widely applied in studying mobilization processes of labile trace metals and oxyanions in water and sediments (Gaulier et al, 2021;Zhou et al, 2020aZhou et al, , 2020bGao et al, 2007Gao et al, , 2015Leermakers et al, 2005). The application of DGT serves many goals: assessment of high-resolution profiles of solutes (in this study at intervals of 5 mm), measurement of labile dissolved solute fractions and revealing the dynamics of sediment porewater and solid phase (using the R ratio).…”

Section: Introductionmentioning

confidence: 99%

Anthropogenic activities influence the mobilization of trace metals and oxyanions in coastal sediment porewaters

Luo

Zhou

et al. 2022

Science of The Total Environment

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Investigation on trace metal speciation and distribution in the Scheldt estuary

Cited by 20 publications

References 85 publications

Speciation of Inorganic Compounds in Aquatic Systems Using Diffusive Gradients in Thin-Films: A Review

Speciation of Inorganic Compounds in Aquatic Systems Using Diffusive Gradients in Thin-Films: A Review

Risk assessment and spatio-temporal distribution of dissolved trace metals in Swarna, Sharavati and Kali estuaries, South-West Coast of India

Anthropogenic activities influence the mobilization of trace metals and oxyanions in coastal sediment porewaters

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