Metal contaminant fluxes across the sediment water interface

Frogner-Kockum, Paul; Göransson, Peter; Åslund, Henrik; Ländell, Märta; Stevens, Rodney L.; Tengberg, Anders; Göransson, Gunnel; Ohlsson, Yvonne

doi:10.1016/j.marpolbul.2016.06.092

Cited by 12 publications

(8 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Importantly, in these calculations the sediment Ni EQS derived for Florida waters were used while guidelines for a range of locations have been derived in the past ∼30 years ranging from 0.27 to 0.75 mmol kg –1 dry wt to protect local marine biota . Furthermore, marine sediments were considered a static sink for metals, while in reality metals are constantly exchanged between the sediment and the overlying water column . Metal efflux from the sediment is mainly driven by molecular diffusion, but it can be significantly enhanced by bioturbation and advection. − To take these metal effluxes into consideration when deriving an olivine application guideline, accurate data on local biological and physicochemical processes in the sediment would be required.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, marine sediments were considered a static sink for metals, while in reality metals are constantly exchanged between the sediment and the overlying water column . Metal efflux from the sediment is mainly driven by molecular diffusion, but it can be significantly enhanced by bioturbation and advection. − To take these metal effluxes into consideration when deriving an olivine application guideline, accurate data on local biological and physicochemical processes in the sediment would be required. However, in the literature these data are scarce and can show significant temporal and spatial variations. , Furthermore, the olivine mixing depth and weathering rate as a function of sediment depth and time need to be well-defined, since they would have a large effect on the magnitude of the metal influx and efflux.…”

Section: Resultsmentioning

confidence: 99%

“…60 Furthermore, marine sediments were considered a static sink for metals, while in reality metals are constantly exchanged between the sediment and the overlying water column. 61 Metal efflux from the sediment is mainly driven by molecular diffusion, but it can be significantly enhanced by bioturbation and advection. 61−63 To take these metal effluxes into consideration when deriving an olivine application guideline, accurate data on local biological and physicochemical processes in the sediment would be required.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…However, in the literature these data are scarce and can show significant temporal and spatial variations. 61,64 Furthermore, the olivine mixing depth and weathering rate as a function of sediment depth and time need to be well-defined, since they would have a large effect on the magnitude of the metal influx and efflux. Currently these data are lacking.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Deriving Nickel (Ni(II)) and Chromium (Cr(III)) Based Environmentally Safe Olivine Guidelines for Coastal Enhanced Silicate Weathering

Flipkens

Blust

Town

2021

Environ. Sci. Technol.

View full text Add to dashboard Cite

Enhanced silicate weathering (ESW) by spreading finely ground silicate rock along the coastal zone to remove atmospheric carbon dioxide (CO2) is a proposed climate change mitigation technique. The abundant and fast-dissolving mineral olivine has received the most attention for this application. However, olivine contains nickel (Ni) and chromium (Cr), which may pose a risk to marine biota during a gigaton-scale ESW application. Herein we derive a first guideline for coastal olivine dispersal based on existing marine environmental quality standards (EQS) for Ni and Cr. Results show that benthic biota are at the highest risk when olivine and its associated trace metals are mixed in the surface sediment. Specifically, depending on local sedimentary Ni concentrations, 0.059–1.4 kg of olivine m–2 of seabed could be supplied without posing risks for benthic biota. Accordingly, globally coastal ESW could safely sequester only 0.51–37 Gt of CO2 in the 21st century. On the basis of current EQS, we conclude that adverse environmental impacts from Ni and Cr release could reduce the applicability of olivine in coastal ESW. Our findings call for more in-depth studies on the potential toxicity of olivine toward benthic marine biota, especially in regard to bioavailability and metal mixture toxicity.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Deriving Nickel (Ni(II)) and Chromium (Cr(III)) Based Environmentally Safe Olivine Guidelines for Coastal Enhanced Silicate Weathering

Flipkens

Blust

Town

2021

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…It is commonly observed that animal burrowing and bioturbation can influence the O 2 flux (Frogner‐Kockum et al, ; Hölker et al, ; Volkenborn et al, ; Ziebis, Huettel, et al, ). Burrowing animals such as ghost shrimp (Volkenborn et al, ) and polychaete worms (Xie et al, ) introduce several features that can influence local O 2 transport.…”

Section: Introductionmentioning

confidence: 99%

Role of Bioroughness, Bioirrigation, and Turbulence on Oxygen Dynamics at the Sediment‐Water Interface

Liu

Reible

Hussain

et al. 2019

Water Resources Research

View full text Add to dashboard Cite

Models that have been developed to quantify the oxygen flux at the sediment‐water interface (SWI) generally do not explicitly consider the influence of bioroughness (mounds and burrows) and bioirrigation. We performed a numerical study of the influence of overlying water velocity, bioroughness, and bioirrigation on the oxygen flux across the SWI. We found that compared with a flat bed, bioroughness significantly increases O2 transport at the SWI as a result of enhanced turbulence and pressure differences across the roughness. Bioirrigation can also enhance O2 transport across the SWI by a factor of up to 10 when the roughness Reynolds number (Re*) is low, but the influence of bioirrigation decreases with increasing Re*. Burrows increase O2 penetration depth, and bioirrigation causes asymmetric distributions of O2 along burrows. Despite the complexity of O2 distribution in sediments, the net exchange across the SWI can be described by the relationship of O'Connor and Harvey (2008, https://doi.org/10.1029/2008WR007160) 0.25em()De/DmRe*Pe1.2=a=0.0005 when the shape is two‐dimensional or when the burrow density is low. When the burrow density is large, flow is three‐dimensional and flow interactions between burrows become important. Under these conditions the net exchange across the SWI increases by up to a factor of 4. A burrow number is introduced, Bu = [burrow density]1/2 [burrow height], to correct the coefficient in O'Connor and Harvey's relationship, that is, a = 0.005 for Bu < 0.05 and a = 0.02 for Bu ≫ 0.1.

show abstract

Benthic fluxes in a subtropical reservoir estimated by pore-water diffusion calculation

Frascareli

Cardoso-Silva

Gontijo

et al. 2022

Water Air Soil Pollut

View full text Add to dashboard Cite

Metal contaminant fluxes across the sediment water interface

Cited by 12 publications

References 18 publications

Deriving Nickel (Ni(II)) and Chromium (Cr(III)) Based Environmentally Safe Olivine Guidelines for Coastal Enhanced Silicate Weathering

Deriving Nickel (Ni(II)) and Chromium (Cr(III)) Based Environmentally Safe Olivine Guidelines for Coastal Enhanced Silicate Weathering

Role of Bioroughness, Bioirrigation, and Turbulence on Oxygen Dynamics at the Sediment‐Water Interface

Benthic fluxes in a subtropical reservoir estimated by pore-water diffusion calculation

Contact Info

Product

Resources

About