Partitioning of Metals Between Dissolved and Particulate Phases in the Salt Marshes of Essex and North Norfolk (UK)

Wiese, Sven; MacLeod, C. L.; Lester, J.N.

doi:10.1080/09593331808616553

Cited by 12 publications

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“…These processes can promote intense biogeochemical cycling at the exchangeable rhizospheric sediment-water inter-face, which promotes fluctuating changes in redox. Similar constraints apply for metals such as Fe, Zn and TP which have been shown in other studies to mobilize in sediment pore water more readily than Pb and Mn under fluctuating redox conditions (Wiese et al 1997;Gutiérrez et al 2019;Kouassi et al 2019). Constrained by climatic conditions and elevation, these dynamic conditions exist especially on the lower reaches of a salt marsh, in sediments receiving regular tidal inundation, and coupled to the presence of diverse vegetation.…”

Section: Bulk Om Metal Pah Distributions and Influence Of Elevationsupporting

confidence: 65%

Geochemical properties of blue carbon sediments through an elevation gradient: study of an anthropogenically impacted coastal lagoon

et al. 2023

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Global research is showing that coastal blue carbon ecosystems are vulnerable to climate change driven threats including accelerated sea-level rise and prolonged periods of drought. Furthermore, direct anthropogenic impacts present immediate threats through deterioration of coastal water quality, land reclamation, long-term impact to sediment biogeochemical cycling. These threats will invariably alter the future efficacy of carbon (C) sequestration processes and it is imperative that currently existing blue carbon habitats be protected. Knowledge of underlying biogeochemical, physical and hydrological interactions occurring in functioning blue carbon habitats is essential for developing strategies to mitigate threats, and promote conditions to optimise C sequestration/storage. In this current work, we investigated how sediment geochemistry (0–10 cm depth) responds to elevation, an edaphic factor driven by long-term hydrological regimes consequently exerting control over particle sedimentation rates and vegetation succession. This study was performed in an anthropogenically impacted blue carbon habitat along a coastal ecotone encompassing an elevation gradient transect from intertidal sediments (un-vegetated and covered daily by tidal water), through vegetated salt marsh sediments (periodically covered by spring tides and flooding events), on Bull Island, Dublin Bay. We determined the quantity and distributions of bulk geochemical characteristics in sediments through the elevation gradient, including total organic carbon (TOC), total nitrogen (TN), total metals, silt, clay, and also, 16 individual polyaromatic hydrocarbon’s (PAH’s) as an indication of anthropogenic input. Elevation measurements for sample sites were determined on this gradient using a LiDAR scanner accompanied by an IGI inertial measurement unit (IMU) on board a light aircraft. Considering the gradient from the Tidal mud zone (T), through the low-mid marsh (M) to the most elevated upper marsh (H), there were significant differences between all zones for many measured environmental variables. The results of significance testing using Kruskal–Wallis analysis revealed, that %C, %N, PAH (µg/g), Mn (mg/kg), TOC:NH4+ and pH are significantly different between all zones on the elevation gradient. The highest values for all these variables exists (excluding pH which followed a reverse trend) in zone H, decreasing in zone M and lowest in the un-vegetated zone T. TC content is 16 fold higher overall in vegetated (3.43 -21.84%) than uninhabited (0.21–0.56%) sediments. TN was over 50 times higher (0.24–1.76%), more specifically increasing in % mass on approach to the upper salt marsh with distance from the tidal flats sediments zone T (0.002–0.05%). Clay and silt distributions were greatest in vegetated sediments, increasing in % content towards upper marsh zones The retention of water, metals, PAHs, mud, chloride ions, NH4+, PO43− and SO42− increased with elevated C concentrations, concurrently where pH significantly decreased. Sediments were categorized with respect to PAH contamination where all SM samples were placed in the high polluted category. The results highlight the ability of Blue C sediments to immobilise increasing levels of C, N, and metals, and PAH with over time and with both lateral and vertical expansion. This study provides a valuable data set for an anthropogenically impacted blue carbon habitat predicted to suffer from sea-level rise and exponential urban development. Graphical abstract Summarized results from this study demonstrating the geochemical changes through an elevation gradient, with a transect encompassing intertidal sediments through supratidal salt marsh sediments within Bull Island’s blue carbon lagoon zones.

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Section: Bulk Om Metal Pah Distributions and Influence Of Elevationsupporting

confidence: 65%

Geochemical properties of blue carbon sediments through an elevation gradient: study of an anthropogenically impacted coastal lagoon

et al. 2023

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“…At lower concentrations of metals, the EC50 value is still less than that predicted by the additive model, although the difference is less marked. This is probably the result of suspended solids or other ions present in the effluent that may influence bioavailability of metals (O'Donnel et al, 1985; Allen and Hansen, 1996; Wiese et al, 1997). Bioavailability and metal toxicity are related to metal partitioning, and it is generally thought that the metal ions, rather than the total metal concentration, better predicts toxicity (O'Donnel et al, 1985; Wiese et al, 1997; Allen and Hansen, 1996).…”

Section: Discussionmentioning

confidence: 99%

“…This is probably the result of suspended solids or other ions present in the effluent that may influence bioavailability of metals (O'Donnel et al, 1985; Allen and Hansen, 1996; Wiese et al, 1997). Bioavailability and metal toxicity are related to metal partitioning, and it is generally thought that the metal ions, rather than the total metal concentration, better predicts toxicity (O'Donnel et al, 1985; Wiese et al, 1997; Allen and Hansen, 1996). Assuming the levels of suspended solids in the effluent remained reasonably constant (although there were no data available to determine whether this is the case), at higher metal concentrations all binding sites would be exhausted, resulting in a higher concentration of free metal ions.…”

Section: Discussionmentioning

confidence: 99%

“…This suggests that it is unlikely that the the result of suspended solids or other ions present in metals in their current concentrations are overtly synerthe effluent that may influence bioavailability of metals gistic. However, we could not exactly reproduce the (O'Donnel et al, 1985;Allen and Hansen, 1996;Wiese chemical changes the effluent may undergo as it passes et al, 1997). Bioavailability and metal toxicity are rethrough the smelter, which excludes ruling out synerlated to metal partitioning, and it is generally thought gistic interactions between trace metals.…”

Section: Empirical Toxicity Comparedmentioning

confidence: 92%

“…This is also true that the metal ions, rather than the total metal concenof the biocide, which was present in the intake water tration, better predicts toxicity (O'Donnel et al, 1985; used in the metal mixture toxicity tests. Wiese et al, 1997;Allen and Hansen, 1996). Assuming the levels of suspended solids in the effluent remained…”

Section: Empirical Toxicity Comparedmentioning

confidence: 99%

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Assessing the Application of an Additive Model to Estimate Toxicity of a Complex Effluent

Ross

Bidwell

2003

J of Env Quality

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A number of industries monitor levels of chemicals in their effluent, but few have undertaken prolonged biological monitoring of this wastewater. The focus of the present study was to determine whether past chemical data for effluent from a lead smelter could be used to estimate its past toxicity. Since the interactive effects of metals in effluents are often assumed to be additive, it was hypothesized that an additive model, 100/[sigma(metal concentration in effluent/EC50 for individual metal)], could be used to generate an EC50 from chemical data (where EC50 is the concentration of test material that affects 50% of the test organisms). To test the approach, a larval development toxicity test with the marine polychaete, Galeolaria caespitosa, was used to test 26 separate samples of effluent from a lead smelter, generating empirical EC50 values. EC50 values for each individual metal in the effluent were also generated using the larval development toxicity test. The concentrations of trace metals in each effluent sample were determined and, using the additive model, EC50 values were calculated. For the majority of effluent samples tested, the additive model underestimated toxicity, suggesting the presence of additional unidentified contaminants in the effluent samples. Additionally, a nonlinear rather than linear regression curve was found to best describe the relationship between the model and empirically derived EC50 values. This relationship was then used to estimate past trends in toxicity of the smelter effluent. Forty-eight percent of the variability in measured toxicity was explained by the model, with the model underestimating toxicity in the majority of samples.

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A geochemical record of the mining history of the Erme Estuary, south Devon, UK

Price

Winkle

Gehrels

2005

Marine Pollution Bulletin

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Partitioning of Metals Between Dissolved and Particulate Phases in the Salt Marshes of Essex and North Norfolk (UK)

Cited by 12 publications

References 0 publications

Geochemical properties of blue carbon sediments through an elevation gradient: study of an anthropogenically impacted coastal lagoon

Geochemical properties of blue carbon sediments through an elevation gradient: study of an anthropogenically impacted coastal lagoon

Assessing the Application of an Additive Model to Estimate Toxicity of a Complex Effluent

A geochemical record of the mining history of the Erme Estuary, south Devon, UK

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