Investigation of trace metal binding properties of lignin by diffusive gradients in thin films

Chemosphere ◽  
2012 ◽  
Vol 89 (3) ◽  
pp. 319-326 ◽  
Author(s):  
Elahe Hojaji
Keyword(s):  
Thin Films ◽  
Trace Metal ◽  
Metal Binding ◽  
Binding Properties ◽  
Diffusive Gradients

scholarly journals Assessment of trace metal binding kinetics in the resin phase of diffusive gradients in thin films

2012 ◽  
Vol 717 ◽  
pp. 143-150 ◽  
Author(s):  
Jacqueline L. Levy ◽  
Hao Zhang ◽  
William Davison ◽  
Jaume Puy ◽  
Josep Galceran
Keyword(s):  
Thin Films ◽  
Trace Metal ◽  
Metal Binding ◽  
Binding Kinetics ◽  
Resin Phase ◽  
Diffusive Gradients

Response of diffusive equilibrium in thin films (DET) and diffusive gradients in thin films (DGT) trace metal profiles in sediments to phytodetritus mineralisation

2012 ◽  
Vol 9 (1) ◽  
pp. 41 ◽  
Author(s):  
Yue Gao ◽  
Martine Leermakers ◽  
Annelies Pede ◽  
Aurelie Magnier ◽  
Koen Sabbe ◽  
...  
Keyword(s):  
Thin Films ◽  
Trace Metals ◽  
Trace Metal ◽  
Phytoplankton Bloom ◽  
Marine Ecosystem ◽  
Trace Metal Concentration ◽  
Water Interface ◽  
Overlying Water ◽  
Study Laboratory ◽  
Diffusive Gradients

Environmental contextContaminated sediments can have a large and lasting effect on marine ecosystems. It was discovered that significant amounts of pollutants, especially arsenic, were released from contaminated sediments during a phytoplankton bloom in the Belgian Continental Zone. Once released to the water column, these pollutants can accumulate up marine food chains and be a source of contaminants to humans. AbstractField data from the Belgian Continental Zone showed elevated trace metal concentrations at the sediment–water interface after the occurrence of a phytoplankton bloom. In the present study, laboratory incubation experiments were used to investigate the effect of the phytodetritus remineralisation process on the release of trace metals from contaminated muddy sediments. This remineralisation process was followed by the measurement of chlorophyll-a and dissolved organic carbon levels in the top sediment layers. Two gel techniques, diffusive equilibrium in thin films (DET) and diffusive gradients in thin films (DGT), were used to assess vertical metal profiles in the sediment pore waters and to calculate the metal effluxes. These metal effluxes compared very well with the trace metal concentration variations in the overlying water of the sediment. Much higher effluxes of Mn, Co and As were observed after 2 days of incubation in the microcosms which received additions of phytodetritus. This trend gradually decreased after 7 days of incubation, suggesting that the elevated efflux of trace metals was proportional to the quantity of phytodetritus mineralised at the sediment–water interface. The release of large amounts of toxic elements from the sediments after phytoplankton blooms can therefore potentially affect the marine ecosystem in the Belgian Continental Zone.

Predicting trace metal bioavailability to chironomids in sediments by diffusive gradients in thin films

2018 ◽  
Vol 636 ◽  
pp. 134-141 ◽  
Author(s):  
Yan He ◽  
Changsheng Guo ◽  
Jiapei Lv ◽  
Song Hou ◽  
Yan Zhang ◽  
...  
Keyword(s):  
Thin Films ◽  
Trace Metal ◽  
Metal Bioavailability ◽  
Diffusive Gradients

Use of the diffusive gradients in thin films technique to evaluate (bio)available trace metal concentrations in river water

2007 ◽  
Vol 387 (6) ◽  
pp. 2239-2244 ◽  
Author(s):  
Pavel Diviš ◽  
Hana Dočekalová ◽  
Lukáš Brulík ◽  
Marek Pavliš ◽  
Petr Hekera
Keyword(s):  
Thin Films ◽  
Trace Metal ◽  
River Water ◽  
Metal Concentrations ◽  
Diffusive Gradients

The use of ultra-thin diffusive gradients in thin-films (DGT) devices for the analysis of trace metal dynamics in soils and sediments: a measurement and modelling approach

2012 ◽  
Vol 9 (4) ◽  
pp. 415 ◽  
Author(s):  
Niklas J. Lehto ◽  
William Davison ◽  
Hao Zhang
Keyword(s):  
Thin Films ◽  
Trace Metal ◽  
Reactive Transport ◽  
Physical Nature ◽  
Data Interpretation ◽  
Transport Modelling ◽  
Suspended Particulate ◽  
Soils And Sediments ◽  
Planar Optode ◽  
Diffusive Gradients

Environmental contextThe recently developed diffusive gradients in thin-films (DGT)-planar optode sandwich probe uses extremely thin resin binding layers, separated from the medium of interest by a very thin material diffusive layer. This work investigates how these changes to the physical nature of a DGT probe are likely to change the interpretation of trace metal measurements in solutions, soils and sediments by using a combination of experimental measurements in well characterised solutions and spiked soils, and advanced reactive transport modelling. AbstractThe interpretation of diffusive gradients in thin-films (DGT) measurements of trace metals in aquatic systems has developed from studies using DGT devices with standard dimensions, but increasingly ultra thin devices are being used for measurements in sediments. This work investigates their performance and the suitability of using traditional data interpretation. The relationship between the concentration of DGT-labile trace metal and the mass of Cu and Cd bound by a 50 µm-thick suspended particulate reagent–imidodiacetate resin binding layer was found to be linear when the total mass of the metals bound by the resin was less than 3 µg cm–2, demonstrating that the capacity is adequate for measurements in uncontaminated environments. An ultra thin DGT probe using a 50 µm-thick resin gel and a 0.01 mm-thick material diffusion layer (MDL), was deployed in soil to demonstrate the spatial resolution in trace metal measurements that can be achieved using this approach. DGT probes with extremely thin (0.01 mm) and more conventional MDLs (0.8 mm) were used to investigate if the mechanisms traditionally used to describe DGT uptake of Cu and Cd from solutions and soil porewaters apply for ultra-thin probes. Interpretation of the results using a dynamic numerical model demonstrated that the processes determining the supply of Cu and Cd to a DGT probe in these media are unlikely to differ for conventional and ultra thin probes, despite the higher metal fluxes to the latter probes. Overall, the results establish that measurements made using ultra-thin DGT devices in soils and sediments can be meaningfully interpreted using an extension of the existing theory.

Trace Metal Measurements in Low Ionic Strength Synthetic Solutions by Diffusive Gradients in Thin Films

2005 ◽  
Vol 77 (17) ◽  
pp. 5440-5446 ◽  
Author(s):  
Kent W. Warnken ◽  
Hao Zhang ◽  
William Davison
Keyword(s):  
Thin Films ◽  
Ionic Strength ◽  
Trace Metal ◽  
Low Ionic Strength ◽  
Diffusive Gradients
Sign in / Sign up

Export Citation Format

Share Document