The Simultaneous Measurement of Phosphorus, Sulfide, and Trace Metals by Ferrihydrite/AgI/Chelex-100 DGT (Diffusive Gradients in Thin Films) Probe at Sediment/Water Interface (SWI) and Remobilization Assessment

2014 ◽  
Vol 225 (11) ◽  
Author(s):  
Zhihao Wu ◽  
Shengrui Wang ◽  
Lixin Jiao ◽  
Fengchang Wu
Keyword(s):  
Thin Films ◽  
Trace Metals ◽  
Simultaneous Measurement ◽  
Water Interface ◽  
Chelex 100 ◽  
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.

scholarly journals Speciation of Inorganic Compounds in Aquatic Systems Using Diffusive Gradients in Thin-Films: A Review

2021 ◽  
Vol 9 ◽  
Author(s):  
Josep Galceran ◽  
Yue Gao ◽  
Jaume Puy ◽  
Martine Leermakers ◽  
Carlos Rey-Castro ◽  
...  
Keyword(s):  
Thin Films ◽  
Trace Metals ◽  
Inorganic Compounds ◽  
Diffusion Flux ◽  
Aquatic System ◽  
Chelex 100 ◽  
Free Ions ◽  
Inorganic Complexes ◽  
Diffusive Gradients

The speciation of trace metals in an aquatic system involves the determination of free ions, complexes (labile and non-labile), colloids, and the total dissolved concentration. In this paper, we review the integrated assessment of free ions and labile metal complexes using Diffusive Gradients in Thin-films (DGT), a dynamic speciation technique. The device consists of a diffusive hydrogel layer made of polyacrylamide, backed by a layer of resin (usually Chelex-100) for all trace metals except for Hg. The best results for Hg speciation are obtained with agarose as hydrogel and a thiol-based resin. The diffusive domain controls the diffusion flux of the metal ions and complexes to the resin, which strongly binds all free ions. By using DGT devices with different thicknesses of the diffusive or resin gels and exploiting expressions derived from kinetic models, one can determine the labile concentrations, mobilities, and labilities of different species of an element in an aquatic system. This procedure has been applied to the determination of the organic pool of trace metals in freshwaters or to the characterization of organic and inorganic complexes in sea waters. The concentrations that are obtained represent time-weighted averages (TWA) over the deployment period.

scholarly journals In situ measurement of trace metals in estuarine waters of Patos Lagoon using diffusive gradients in thin films (DGT)

2009 ◽  
Vol 20 (2) ◽  
pp. 333-340 ◽  
Author(s):  
Mônica Wallner-Kersanach ◽  
Carlos Francisco F. de Andrade ◽  
Hao Zhang ◽  
Márcio R. Milani ◽  
Luis Felipe H. Niencheski
Keyword(s):  
Thin Films ◽  
Trace Metals ◽  
In Situ Measurement ◽  
Patos Lagoon ◽  
Estuarine Waters ◽  
Diffusive Gradients

Simultaneous measurement of fifteen rare earth elements using diffusive gradients in thin films

2018 ◽  
Vol 1031 ◽  
pp. 98-107 ◽  
Author(s):  
Yumin Yuan ◽  
Shiming Ding ◽  
Yan Wang ◽  
Liping Zhang ◽  
Mingyi Ren ◽  
...  
Keyword(s):  
Thin Films ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Simultaneous Measurement ◽  
Diffusive Gradients

The role of sediment-feeding oligochaeteTubifex on the availability of trace metals in sediment pore waters as determined by diffusive gradients in thin films (DGT)

2002 ◽  
Vol 2 (2) ◽  
pp. 71-76 ◽  
Author(s):  
Jan-Willem M. Wegener ◽  
Gerard A. van den Berg ◽  
Gerard J. Stroomberg ◽  
Martin J. M. van Velzen
Keyword(s):  
Thin Films ◽  
Trace Metals ◽  
Pore Waters ◽  
Diffusive Gradients

Evaluation of the diffusive gradients in thin films technique using a mixed binding gel for measuring iron, phosphorus and arsenic in the environment

2015 ◽  
Vol 17 (3) ◽  
pp. 570-577 ◽  
Author(s):  
Qin Sun ◽  
Liping Zhang ◽  
Shiming Ding ◽  
Chao Li ◽  
Jinyan Yang ◽  
...  
Keyword(s):  
Thin Films ◽  
Zirconium Oxide ◽  
Dissolved Iron ◽  
Chelex 100 ◽  
Simultaneous Measurements ◽  
Diffusive Gradients

Simultaneous measurements of dissolved iron (Fe), phosphorus (P), and arsenic (As) were made using the diffusive gradients in thin films technique equipped with a mixed binding gel impregnated with zirconium oxide and Chelex-100 (ZrO–Chelex DGT).

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