Diffusive gradients in thin films for predicting methylmercury bioavailability in freshwaters after photodegradation

Fernández-Gómez, Cristal; Bayona, Josep M.; Dı́ez, Sergi

doi:10.1016/j.chemosphere.2015.02.060

Cited by 18 publications

(10 citation statements)

References 45 publications

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“…One advantage of thiol‐based samplers is that they may mimic the dominant MeHg ligands in nature (Zhang et al ; Jeremiason et al ; Liem‐Nguyen et al ) and thus potentially provide a good predictor of the flux to aquatic organisms. As a result, site‐specific uptake by thiol‐based DGT samplers (commonly referred to as C DGT or DGT‐labile) has been used to predict Hg availability for methylation (Ndu et al ), de novo MeHg production (Clarisse et al ), MeHg photodegradation rates (Fernández‐Gómez et al ), and MeHg uptake by biota (Clarisse et al ; Liu et al ; Amirbahman et al ).…”

Section: Introductionmentioning

confidence: 99%

Development of a Novel Equilibrium Passive Sampling Device for Methylmercury in Sediment and Soil Porewaters

Sanders

McBurney

Gilmour

et al. 2020

Enviro Toxic and Chemistry

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We explored the concept of equilibrium passive sampling for methylmercury (MeHg) using the strategy developed for hydrophobic organic chemicals. Passive sampling should allow prediction of the concentration of the chemically labile fraction of MeHg in sediment porewaters based on equilibrium partitioning into the sampler, without modeling diffusion rates through the sampler material. Our goals were to identify sampler materials with the potential to mimic MeHg partitioning into animals and sediments and provide reversible sorption in a time frame appropriate for in situ samplers. Candidate materials tested included a range of polymers embedded with suitable sorbents for MeHg. The most promising were activated carbon (AC) embedded in agarose, thiol-self-assembled monolayers on mesoporous supports embedded in agarose, and cysteine-functionalized polyethylene terephthalate, which yielded log sampler-water partition coefficients of 2.8 to 5 for MeHgOH and MeHg complexed with dissolved organic matter (Suwannee River humic acid). Sampler equilibration time in sediments was approximately 1 to 2 wk. Investigation of the MeHg accumulation mechanism by AC embedded in agarose suggested that sampling was kinetically influenced by MeHg interactions with AC particles and not limited by diffusion through the gel for this material. Also, AC exhibited relatively rapid desorption of Hg and MeHg, indicating that this sorbent is capable of reversible, equilibrium measurements. In sediment:water microcosms, porewater concentrations made with isotherm-calibrated passive samplers agreed within a factor of 2 (unamended sediment) or 4 (AC-amended sediment) with directly measured concentrations. The present study demonstrates a potential new approach to passive sampling of MeHg. Environ Toxicol Chem 2020;39:323-334.

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Section: Introductionmentioning

confidence: 99%

Development of a Novel Equilibrium Passive Sampling Device for Methylmercury in Sediment and Soil Porewaters

Sanders

McBurney

Gilmour

et al. 2020

Enviro Toxic and Chemistry

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“…It is worth noting that the toxicity of organometallics tended to be higher than inorganic metals, therefore accurate measurement of organometallics is critical. Fernandez-Gomez et al (2015) measured and predicted the concentration and bioavailability of MeHg in water using thiol-functionalized resin gel DGT, confirming the DOM can enhance the MeHg photodegradation process. DGT based on silica-bound sorbents was successfully employed for the measurement of five organotin compounds in sediments (Cole et al 2018).…”

Section: Measurement Of Time-averaged Concentrationsmentioning

confidence: 77%

“…Spheron-Thiol resins were developed to determine Hg(II) and MeHg, showing a stronger affinity for mercury species than Chelex-100 (Docekalova and Divis 2005;Fernandez-Gomez et al 2011). Three-mercaptopropyl functionalized silica (Clarisse et al 2012;Fernandez-Gomez et al 2015), the ion exchange resin Duolite GT73 and Ambersep GT74 as well as the novel functionalized macroporous cross-linked polystyrene (Tulsion ® CH-95) can measure several mercury species (Pelcova et al 2014(Pelcova et al , 2015Ren et al 2018a). Further, we found the Tulsion ® CH-95 binding agent has higher adsorption capacity and elution efficiency for Hg(II) and MeHg than other adsorbents (Ren et al 2018a).…”

Section: Single Solid Binding Agentsmentioning

confidence: 99%

Diffusive gradients in thin films: devices, materials and applications

Ding

Yang

et al. 2018

Environ Chem Lett

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HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…Therefore, the DGT allows in situ evaluation of labile fractions and by approximation, bioavailability of metal species in aqueous environments, including natural waters (Zhang et al 1998;Clarisse et al 2009;Lucas et al 2012;Turull et al 2017aTurull et al , 2018Bratkič et al 2019;Gao et al 2019c), sediments (Harper et al 1998(Harper et al , 2000Gao et al 2009;Yin et al 2014) and soils (Docekalová et al 2012;Song et al 2015;Turull et al 2019a, b;Babalola and Zhang 2021), based on the behavior of the labile species in the diffusive layer is similar to the behavior in the proximity of biological membrane (Clarisse et al 2012;Amirbahman et al 2013;Fernández-Gómez et al 2015). The DGT passive sampler houses a binding gel and a diffusive gel protected by a membrane filter, that permits the diffusion of free ions and labile complexes through the diffusive layer that are irreversibly uptake by the specific binding layer.…”

Section: Concepts and Theory Of Diffusive Gradient In Thin Filmsmentioning

confidence: 99%

Diffusive gradients in thin films for the measurement of labile metal species in water and soils: a review

et al. 2021

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The determination of the concentration of an environmental pollutant is not sufficient to assess the related health risk because this pollutant may not be bioavailable. Therefore, methods to determine pollutant bioavailability are more relevant to assess toxicity than measuring the total concentration. For instance, the diffusive gradient in thin films (DGT) is an in situ dynamic technique used to measure the concentration of labile compounds in the environment. Here we review the latest developments achieved in speciation and bioavailability of metals and metalloids using this technique. We detail the technique, common binding agents and diffusive gels. We give laboratory procedures to prepare the gels, and we explain calculations using the DGT-induced fluxes in soils (DIFS) modeling. DIFS models can predict the resupply capacities from soils to porewater, and the uptake of trace elements by plants. Procedures for in situ field deployments, including issues of biofilm growth, are also discussed.

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Diffusive gradients in thin films for predicting methylmercury bioavailability in freshwaters after photodegradation

Cited by 18 publications

References 45 publications

Development of a Novel Equilibrium Passive Sampling Device for Methylmercury in Sediment and Soil Porewaters

Development of a Novel Equilibrium Passive Sampling Device for Methylmercury in Sediment and Soil Porewaters

Diffusive gradients in thin films: devices, materials and applications

Diffusive gradients in thin films for the measurement of labile metal species in water and soils: a review

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