Access the full text.
Sign up today, get DeepDyve free for 14 days.
Sophie Tankéré-Muller, Hao Zhang, W. Davison, N. Finke, O. Larsen, H. Stahl, R. Glud (2007)
Fine scale remobilisation of Fe, Mn, Co, Ni, Cu and Cd in contaminated marine sedimentMarine Chemistry, 106
L. Sochaczewski, W. Tych, W. Davison, H. Zhang (2007)
2D DGT induced fluxes in sediments and soils (2D DIFS)Environ. Model. Softw., 22
Michael Harper, W. Davison, W. Tych (1999)
Estimation of Pore Water Concentrations from DGT Profiles: A Modelling ApproachAquatic Geochemistry, 5
T. Shaw, J. Gieskes, R. Jahnke (1990)
Early diagenesis in differing depositional environments: The response of transition metals in pore waterGeochimica et Cosmochimica Acta, 54
E. Tipping (2002)
Cation Binding by Humic Substances
William Davison, G. Fones, Geoffrey Grime (1997)
Dissolved metals in surface sediment and a microbial mat at 100-μm resolutionNature, 387
Hao Zhang, W. Davison, R. Mortimer, M. Krom, P. Hayes, I. Davies (2002)
Localised remobilization of metals in a marine sediment.The Science of the total environment, 296 1-3
P. Teasdale, Sean Hayward, William Davison (1999)
In situ, High-Resolution Measurement of Dissolved Sulfide Using Diffusive Gradients in Thin Films with Computer-Imaging Densitometry.Analytical chemistry, 71 11
A. Widerlund, W. Davison (2007)
Size and density distribution of sulfide-producing microniches in lake sediments.Environmental science & technology, 41 23
H. Ernstberger, Hao Zhang, A. Tye, S. Young, W. Davison (2005)
Desorption kinetics of Cd, Zn and Ni measured in intact soils by DGT.
Hao Zhang, W. Davison, S. Miller, W. Tych (1995)
IN SITU HIGH RESOLUTION MEASUREMENTS OF FLUXES OF NI, CU, FE, AND MN AND CONCENTRATIONS OF ZN AND CD IN POREWATERS BY DGTGeochimica et Cosmochimica Acta, 59
Michael Harper, W. Davison, W. Tych (2000)
DIFS - a modelling and simulation tool for DGT induced trace metal remobilisation in sediments and soilsEnviron. Model. Softw., 15
M. Leermakers, Y. Gao, C. Gabelle, S. Lojen, B. Ouddane, M. Wartel, W. Baeyens (2005)
Determination of High Resolution Pore Water Profiles of Trace Metals in Sediments of the Rupel River (Belgium) using Det (Diffusive Equilibrium in Thin Films) and DGT (Diffusive Gradients in Thin Films) TechniquesWater, Air, and Soil Pollution, 166
H. Ernstberger, H. Zhang, W. Davison (2002)
Determination of chromium speciation in natural systems using DGTAnalytical and Bioanalytical Chemistry, 373
E. Tipping (1994)
WHAM—a chemical equilibrium model and computer code for waters, sediments, and soils incorporating a discrete site/electrostatic model of ion-binding by humic substancesComputers & Geosciences, 20
Leermakers M.
Determination of high resolution pore water profiles of trace metals in sediments of the Rupel
Phil Monbet, I. McKelvie, P. Worsfold (2008)
Combined gel probes for the in situ determination of dissolved reactive phosphorus in porewaters and characterization of sediment reactivity.Environmental science & technology, 42 14
G. Fones, W. Davison, O. Holby, B. Jørgensen, B. Thamdrup (2001)
High‐resolution metal gradients measured by in situ DGT/DET deployment in Black Sea sediments using an autonomous benthic landerLimnology and Oceanography, 46
Christopher DeVries, Feiyue Wang (2003)
In situ two-dimensional high-resolution profiling of sulfide in sediment interstitial waters.Environmental science & technology, 37 4
L. Sigg, F. Black, J. Buffle, Jun Cao, R. Cleven, W. Davison, J. Galceran, Peggy Gunkel, E.J.J. Kalis, David Kistler, Michel Martin, Stéphane Noël, Y. Nur, N. Odẑak, J. Puy, W. Riemsdijk, E. Temminghoff, M. Tercier-Waeber, Stefanie Toepperwien, R. Town, Emily Unsworth, Kent Warnken, L. Weng, H. Xue, Hao Zhang (2006)
Comparison of analytical techniques for dynamic trace metal speciation in natural freshwaters.Environmental science & technology, 40 6
H. Ernstberger, Hao Zhang, A. Tye, S. Young, W. Davison (2005)
Desorption kinetics of Cd, Zn, and Ni measured in soils by DGT.Environmental science & technology, 39 6
Ernstberger H.
Simultaneous in situ measurement of chromium speciation in natural systems.
M. Motelica‐Heino, C. Naylor, Hao Zhang, W. Davison (2003)
Simultaneous release of metals and sulfide in lacustrine sediment.Environmental science & technology, 37 19
N. Lehto, L. Sochaczewski, W. Davison, W. Tych, H. Zhang (2008)
Quantitative assessment of soil parameter (KD and TC) estimation using DGT measurements and the 2D DIFS model.Chemosphere, 71 4
Michael Harper, W. Davison, Hao Zhang, W. Tych (1998)
Kinetics of metal exchange between solids and solutions in sediments and soils interpreted from DGT measured fluxesGeochimica et Cosmochimica Acta, 62
H. Jannasch, B. Honeyman, L. Balistrieri, W. James (1988)
Kinetics of trace element uptake by marine particlesGeochimica et Cosmochimica Acta, 52
R. Glud, N. Ramsing, J. Gundersen, I. Klimant (1996)
Planar optrodes: a new tool for fine scale measurements of two-dimensional O2 distribution in benthic communitiesMarine Ecology Progress Series, 140
G. Fones, W. Davison, J. Hamilton-Taylor (2004)
The fine-scale remobilization of metals in the surface sediment of the North-East AtlanticContinental Shelf Research, 24
Michael Harper, W. Davison, W. Tych (1999)
One-dimensional views of three-dimensional sediments.Environmental Science & Technology, 33
Environmental context. Observations, using the technique of diffusive gradients in thin-films (DGT), of pronounced, small-scale (millimetre) maxima in concentrations of sulfide and metals in the pore water of sediments, have emphasised the importance of processes occurring in microniches. Modelling of the interactions between microniche sources and DGT devices within a sediment environment demonstrates how these sharp features arise and provides a basis for their quantitative interpretation. Abstract. Measurements in sediments made using DGT (diffusive gradients in thin-films) have shown small-scale (millimetre and sub-millimetre) maxima in solute concentration (e.g trace metals and sulfide). The sediment–DGT system was simulated using a dynamic model, which incorporated a spherical microniche close to the DGT surface. DGT maxima could arise when the microniche was (1) a local source with associated elevated concentration in the pore water, and (2) when, within the microniche, the K d for the relevant solute partitioning with exchangeable solute associated with the solid phase was much higher than for the rest of the sediment. Use of realistic values of K d and comparison with existing data suggested that the latter mechanism was unlikely to be responsible for observed DGT maxima. Locally elevated concentrations will be reasonably accurately reproduced by DGT. Peak height measured by DGT will be between 62 and 87% of the true maxima in concentration within the sediment when DGT is not present, while peak widths will be similar. This work provides, for the first time, a means for confidently interpreting the two dimensional images of DGT-measured concentrations in sediments.
Environmental Chemistry – CSIRO Publishing
Published: Dec 18, 2009
Keywords: microniche, sulfide, trace metals.
Read and print from thousands of top scholarly journals.
Already have an account? Log in
Bookmark this article. You can see your Bookmarks on your DeepDyve Library.
To save an article, log in first, or sign up for a DeepDyve account if you don’t already have one.
Copy and paste the desired citation format or use the link below to download a file formatted for EndNote
Access the full text.
Sign up today, get DeepDyve free for 14 days.
All DeepDyve websites use cookies to improve your online experience. They were placed on your computer when you launched this website. You can change your cookie settings through your browser.