Distributions of dissolved titanium in porewaters of estuarine and coastal marine sediments

Skrabal, Stephen A.; Terry, Christopher

doi:10.1016/s0304-4203(01)00077-9

Cited by 37 publications

(13 citation statements)

References 61 publications

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“…The sampling stations in the MC were located at the edge of the Patagonian shelf (300–400 km offshore), suggesting that additional supply of dTi might have occurred via coastal erosion or resuspension of shelf sediments [ Gaiero et al , 2003; Pierce and Siegel , 1979]. Suspended material may be transported offshore with surface currents [ Pierce and Siegel , 1979], however, previous studies showed only small release of dTi through sediment resuspension [ Skrabal and Terry , 2002] compared to considerable release of dAl [ Moran and Moore , 1991; Skrabal and Terry , 2002]. Similarly, pore water profiles indicate the benthic supply of both metals to bottom waters [ Skrabal and Terry , 2002].…”

Section: Resultsmentioning

confidence: 99%

“…Suspended material may be transported offshore with surface currents [ Pierce and Siegel , 1979], however, previous studies showed only small release of dTi through sediment resuspension [ Skrabal and Terry , 2002] compared to considerable release of dAl [ Moran and Moore , 1991; Skrabal and Terry , 2002]. Similarly, pore water profiles indicate the benthic supply of both metals to bottom waters [ Skrabal and Terry , 2002]. The supply of excess dTi over dAl in the MC is thus unlikely, suggesting that the deviating distributions and residence times of dAl and dTi rather result from the preferential removal of dAl over dTi.…”

Section: Resultsmentioning

confidence: 99%

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Surface water dissolved aluminum and titanium: Tracers for specific time scales of dust deposition to the Atlantic?

Dammshäuser

Wagener

Croot

2011

Geophys. Res. Lett.

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[1] Surface water distributions of dissolved Al (dAl) and dissolved Ti (dTi) were investigated along a meridional Atlantic transect and related to dust deposition estimates. In the zone of Saharan dust deposition, highest dAl concentrations occurred in the tropical salinity minimum and suggest increasing Al dissolution from Saharan aerosols with wet deposition. By contrast, the dTi distribution is not related to precipitation but agrees with the pattern of annual dust deposition. In the zone of Patagonian dust deposition, elevated dTi concentrations contrasted with decreased dAl concentrations, indicating excess dAl scavenging onto biogenic particles in surface waters. Estimated residence times range from months to years for dAl and are ∼10 times higher for dTi. This suggests that dAl reflects seasonal changes in dust deposition, while dTi is related to longer temporal scales. However, spatial variations in input and removal processes complicate the quantification of dust deposition from surface water concentrations. Citation: Dammshäuser, A., T. Wagener, and P. L. Croot (2011), Surface water dissolved aluminum and titanium: Tracers for specific time scales of dust deposition to the Atlantic?, Geophys.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Surface water dissolved aluminum and titanium: Tracers for specific time scales of dust deposition to the Atlantic?

Dammshäuser

Wagener

Croot

2011

Geophys. Res. Lett.

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“…9B) may be explained by Ti incorporation into clay minerals (Zuther et al. , 2000; Skrabal & Terry, 2002; Zhang et al. , 2002).…”

Section: Discussionmentioning

confidence: 99%

Geochemistry of Holocene salt marsh and tidal flat sediments on a barrier island in the southern North Sea (Langeoog, North‐west Germany)

Kolditz

Dellwig²,

Barkowski

et al. 2011

Sedimentology

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The barrier islands of the southern North Sea were formed during the Holocene sea-level rise. These islands form part of a highly dynamic environment whose evolution continues today. Subjected to sea-level changes, tides and storm events, the sedimentary record reflects processes occurring under varying energy conditions. This article presents geochemical, mineralogical and diatom investigations carried out in the salt marsh of the East Frisian barrier island of Langeoog, which is re-exposed to a rising sea-level due to de-embankment. The major aim of this study is to improve the knowledge of the sedimentological and geochemical development of these deposits under the influence of sea-level rise, with a special focus on the geochemistry and distribution of heavy mineral-associated elements. Correlation diagrams between FeO, TiO 2 and MnO, as well as ternary plots (Al 2 O 3 -SiO 2 -Zr or TiO 2 ), clearly indicate the variable appearance of heavy minerals in different lithological facies, comprising marsh soil, mixed and sand flat, and relocated beach sands. A dominating abundance of ilmenite followed by zircon, garnets and some other heavy minerals is evidenced by Scanning Electron Microscope-Energy Dispersive X-ray measurements. The data presented here suggests that these geochemical proxies are useful tools for characterizing depositional energy conditions. Increasing depositional energy is evident for the lithological units in the following order: marsh soil, mixed flat, sand flat and relocated beach sand. The energetic conditions during sediment deposition, as well as the sedimentary history, are confirmed by diatom analyses as an additional independent indicator. Depending on source rock composition, the geochemical parameters used in this study may also help to investigate depositional energy regimes of other siliciclastic sedimentary systems.

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“…Hawker & Connell 1985, 1986,b, Baughman & Perenich 1988, Markwell et al 1989, Just et al 1990, De la Torre et al 1995, Karrupiah & Gupta 1996, Hamer et al 1999, Mitra & Dickhut 1999, Chu & Chan 2000, Berglund et al 2001, Nipper et al 2002, Skrabal & Terry 2002, Williamson et al 2002 (Fig. 1).…”

Section: The 3-phase Modelmentioning

confidence: 96%

Protein model for pollutant uptake and elimination by living organisms and its implications for ecotoxicology

Quinnell¹,

Hulsman²,

Davie³

2004

Mar. Ecol. Prog. Ser.

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The conceptual model on which chemical assessment of pollutants is based is flawed. The assumption in ecotoxicology -that pollutants cross the biological membrane only by passive diffusion of their solute phase (diffusion model) and thus, that only water-soluble pollutants are biologically available -is inconsistent with the biologists' understanding of the role and functioning of the biological membrane. The biological membrane both isolates organisms, cells and organelles from their external environments and regulates cross-membrane trafficking of polar and non-polar substances. Trafficking regulation is a function of proteins dissolved within the membrane. An alternative protein model for pollutant uptake and elimination is proposed that provides a credible explanation of how solid-phase pollutants, such as those bound to aquatic sediments and soils, may be readily incorporated by living organisms. Current chemical testing is likely to underestimate the risk posed to organisms by sediment and soil-bound pollutants. New techniques for assessing the bioavailability and impacts of pollutants, based on the protein model, are urgently needed.

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Distributions of dissolved titanium in porewaters of estuarine and coastal marine sediments

Cited by 37 publications

References 61 publications

Surface water dissolved aluminum and titanium: Tracers for specific time scales of dust deposition to the Atlantic?

Surface water dissolved aluminum and titanium: Tracers for specific time scales of dust deposition to the Atlantic?

Geochemistry of Holocene salt marsh and tidal flat sediments on a barrier island in the southern North Sea (Langeoog, North‐west Germany)

Protein model for pollutant uptake and elimination by living organisms and its implications for ecotoxicology

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