High-resolution profiles of trace metals in the pore waters of riverine sediment assessed by DET and DGT

Gao, Yue; Leermakers, Martine; Gabelle, C.; Diviš, Pavel; Billon, Gabriel; Ouddane, Baghdad; Fischer, J-C.; Wartel, M.; Baeyens, Willy

doi:10.1016/j.scitotenv.2005.11.023

Cited by 67 publications

(53 citation statements)

References 18 publications

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“…Diffusional equilibration in thin film analysis has been used to measure the co-distribution of redox-sensitive solutes and contaminant trace metals under low redox potential conditions, with depth in 'soft' fine grained sediment (TankereMuller et al 2007;Gao et al 2006). The present study incorporated a temporal element and measured the mechanistic interactions of redox-sensitive solutes and dissolved Zn, at the start and end of a flood period.…”

Section: Discussionmentioning

confidence: 99%

Critical control of flooding and draining sequences on the environmental risk of Zn-contaminated riverbank sediments

2017

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Purpose Diffuse pollution emanating from metal miningimpacted sediment could serve as a barrier to achieving European Union Water Framework Directive and US Clean Water Act requirements. UK climate projections (UKCP09) predict increases in rainfall and aridity that will influence river stage alternately exposing and submersing contaminated riverbank sediment. Research focuses on the environmental contaminant dissolved Zn and investigates patterns of release, key geochemical mechanisms controlling Zn mobilisation and the environmental risk of sediment subjected to these perturbations. Materials and methods Using two laboratory mesocosm experiments, metal mining-contaminated sediment was subjected to alternate wet and dry sequences of different duration and frequency. The first experiment was run to determine the influence of submersion and exposure of contaminated sediment on releases of Zn and to establish environmental risk. The second experiment utilised diffusional equilibration in thin film (DET) to observe the patterns of Zn release, with depth, in the sediment. Pore water chemical analysis at the sediment-water interface enabled elucidation of key geochemical mechanisms of control of Zn mobilisation.Results and discussion Patterns of Zn release were found to be different, depending on the length of wet and dry period. High concentrations of dissolved Zn were released at the start of a flood for runs with longer dry periods. A buildup of soluble Zn sulphate minerals over long dry periods followed by dissolution on first flood wetting was a key geochemical mechanism controlling Zn release. For longer wet runs, increases in dissolved Mn and Zn were observed over the flood period. Key geochemical mechanisms controlling Zn mobilisation for these runs were: (i) reductive dissolution of Mn (hydr)oxides and release of partitioned Zn over prolonged flood periods followed by (ii) oxidation and precipitation of Mn (hydr)oxides and sorption of Zn on exposure to atmospheric conditions. Conclusions Mesocosm experiments were a first step in understanding the effects of UK climate projections on the riverbank environment. Contaminated sediment was found to pose a significant environmental risk in response to hydrological perturbations. The 'transient' nature of dissolved Zn release could make identifying the exact sources of pollution a challenge; therefore, further field studies are advised to monitor contaminant releases under a range of hydrological conditions and account for complex hydrology at mining sites.

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Section: Discussionmentioning

confidence: 99%

Critical control of flooding and draining sequences on the environmental risk of Zn-contaminated riverbank sediments

2017

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“…The DET and DGT technique probe preparations and deployments were similar to those described by Zhang et al (2002) and Gao et al (2006). The diffusive gel (0.8 mm thickness), resin gel (0.4 mm thickness), and the DGT and DET probes were obtained from DGT Research Ltd., UK.…”

Section: Det and Dgt Probe Preparation And Deploymentmentioning

confidence: 99%

“…Due to the complicated interactions between the river and sea and the water chemical condition (such as variations in pH and redox potential) in estuaries, some metals, such as iron (Fe), manganese (Mn), cobalt (Co), cadmium (Cd), copper (Cu) and zinc (Zn), might frequently undergo deposition and resuspension at the interface of sediment and water (Fan et al 2009;Stockdale et al 2010;Sakellari et al 2011). This phenomenon is similar to a ''time bomb'' for estuaries (Gao et al 2006;Feng et al 2011). Increasing human activities, such as industry and shipping, have greatly amplified this stress.…”

Section: Introductionmentioning

confidence: 97%

“…With the development of diffusive equilibrium in thin films (DET) and diffusive gradients in thin films (DGT), high-resolution vertical or horizontal profiles of metals in sediment pore water can be assessed on a scale of millimeters or less (Davison and Zhang 1994;Zhang et al 2002;Gao et al 2006). Compared to the dialysis cell technique, DET can determine the pore water concentration in sediment quickly and directly (Davison et al 1991;Harper et al 1997).…”

Section: Introductionmentioning

confidence: 99%

“…It uses a layer of Chelex cation exchange resin placed behind a layer of hydrogel that is covered with a 0.45-lm membrane, through which metal ions are allowed to diffuse freely through (Sakellari et al 2011). Using a DET or DGT technique, several studies have effectively revealed the behavior and role of diffusional transport and the (re)supply of metals, such as Fe, Mn, Co, Cd, Cu and Zn, from sediments to solution in the sediments of the freshwater and marine depositional environments (Gao et al 2006;Stockdale et al 2010;Sakellari et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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High-resolution profiles of iron, manganese, cobalt, cadmium, copper and zinc in the pore water of estuarine sediment

Zhang

Guo

Yang

et al. 2012

Int. J. Environ. Sci. Technol.

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The remobilization of iron, manganese, cobalt, cadmium, copper and zinc in the pore water of estuarine sediment cores at Yingkou was assessed using diffusive equilibrium in thin films and diffusive gradients in thin films techniques. A relatively anoxic system (?33.7 to -224.1 mV) in the sediment cores might cause the reductive release of iron, manganese and cobalt into pore water from the estuarine sediment. High-average concentrations of iron (47.85 lg ml -1 ) and manganese (3.81 lg ml -1 ) were observed using diffusive equilibrium in thin films on the sediment core, but the concentration of cobalt (18.02 ng ml -1 ) was relatively low. A strong correlation between iron and cobalt was observed based on the vertical profiles of the metals. Manganese and iron were more readily released from the solid phase to the solution. The peak cobalt, copper and zinc concentrations were observed in the upper layer (2-4 cm) measured using diffusive gradients in thin films. However, the peak iron, manganese and cobalt concentrations were located in the deeper layer (C7 cm). In addition, the concentration profiles measured using diffusive gradients in thin films of cobalt, copper and zinc were independent of the iron, manganese and cobalt distribution with respect to depth.

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Fractionation and Speciation of Trace Elements in Soil Solution

Laing

2010

Trace Elements in Soils

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High-resolution profiles of trace metals in the pore waters of riverine sediment assessed by DET and DGT

Cited by 67 publications

References 18 publications

Critical control of flooding and draining sequences on the environmental risk of Zn-contaminated riverbank sediments

Critical control of flooding and draining sequences on the environmental risk of Zn-contaminated riverbank sediments

High-resolution profiles of iron, manganese, cobalt, cadmium, copper and zinc in the pore water of estuarine sediment

Fractionation and Speciation of Trace Elements in Soil Solution

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