Preparation of guanidinylated carboxymethyl chitosan and its application in the diffusive gradients in thin films (DGT) technique for measuring labile trace metals in water

2018 ◽  
Vol 98 (14) ◽  
pp. 1275-1291 ◽  
Author(s):  
Yuanyuan Ding ◽  
Jianhong Yang ◽  
Jun Cai
Keyword(s):  
Thin Films ◽  
Trace Metals ◽  
Carboxymethyl Chitosan ◽  
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 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

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

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 Effects of a mixture of ligands on metal accumulation in diffusive gradients in thin films (DGT)

2018 ◽  
Vol 15 (3) ◽  
pp. 183 ◽  
Author(s):  
Alexandra Altier ◽  
Martín Jiménez-Piedrahita ◽  
Ramiro Uribe ◽  
Carlos Rey-Castro ◽  
Joan Cecília ◽  
...  
Keyword(s):  
Thin Films ◽  
Trace Metals ◽  
Aquatic Organisms ◽  
Nitrilotriacetic Acid ◽  
Series Of Experiments ◽  
Metal Flux ◽  
Predicted Values ◽  
The Individual ◽  
Synthetic Media ◽  
Diffusive Gradients

Environmental contextThe availability of trace metals to aquatic organisms is influenced by the natural ligands present in water. We investigate the influence of the composition of the system on the availability of metal cations as nutritive or toxic species. The focus is on clarifying whether availability measured in single-ligand systems with diffusive gradients in thin film devices can be used to predict accumulation in mixtures. AbstractNatural waters contain mixtures of ligands, which collectively affect the availability of trace metals. The individual contribution of each complex to the overall metal flux received by a sensor can be described in terms of its lability degree. The question arises as to whether the mixture entails specific non-additive effects, i.e. to what extent is it possible to predict the collective behaviour of the mixture from the values of the lability degree of each single ligand system (SLS). For this reason, a series of experiments with diffusion gradients in thin films (DGT) devices were carried out to measure nickel accumulation from synthetic media comprising either nitrilotriacetic acid (NTA), ethylenediamine (EN) or mixtures of both ligands. The results were compared with numerical simulations. It is shown that NiNTA becomes more inert in the mixture than in the SLS that contains the same concentration of free Ni and NiNTA, whereas the opposite is true for the Ni bound to EN, which becomes more labile in the mixture than in the SLS. This unprecedented behaviour arises when one of the ligands (NTA, forming strong and partially labile complexes) is present under non-excess conditions. As NiNTA and NiEN have an opposite influence on the lability degree of each other, the sum of partial fluxes calculated from the lability degrees obtained in SLSs yields a reasonable estimate of DGT performance in the mixture. Experimental accumulations in the mixture are just slightly below the predicted values, with errors lower than 11 % when NTA concentrations vary from 20 to 100 % of the total Ni concentration.

Evaluation of diffusive gradients in thin films (DGT) technique for speciation of trace metals in estuarine waters - A multimethodological approach

2020 ◽  
Vol 721 ◽  
pp. 137784 ◽  
Author(s):  
Ana-Marija Cindrić ◽  
Saša Marcinek ◽  
Cédric Garnier ◽  
Pascal Salaün ◽  
Neven Cukrov ◽  
...  
Keyword(s):  
Thin Films ◽  
Trace Metals ◽  
Estuarine Waters ◽  
Diffusive Gradients
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