Phytochelatin synthesis in response to Hg uptake in aquatic plants near a chlor-alkali factory

Turull, Marta; Grmanová, Gabriela; Dago, Àngela; Ariño, Cristina; Dı́ez, Sergi; Dı́az-Cruz, José Manuel; Esteban, Miquel

doi:10.1016/j.chemosphere.2017.02.092

Cited by 17 publications

(7 citation statements)

References 32 publications

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“…During the breeding season, they feed preferentially on trawler discards (Oro and Ruiz 1997), which contain both demersal and mesopelagic fish. A continuous release of Hg, from the chlor-alkali plant located 60 km upstream in the dissolve and particulate phase (Turull et al 2017) would increase the Hg body burden of particular demersal fish species. Hg concentrations in demersal fish from the Ebro Delta can be more than double those in epipelagic fish (Arcos et al 2002), and consequently Hg concentrations can sharply increase by a diet containing demersal fish (Arcos et al 2002).…”

Section: Resultsmentioning

confidence: 99%

Temporal and Spatial Distribution of Mercury in Gulls Eggs from the Iberian Peninsula

Pereira

Lawlor

Bertolero³

et al. 2018

Arch Environ Contam Toxicol

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We examined how coastal mercury contamination varied spatially and temporally across the Iberian Peninsula by measuring mercury concentrations in the eggs of the sentinel biomonitor yellow-legged gull (Larus michahellis). Samples were collected from eight colonies that ranged from the Atlantic across the south and northern areas of the Mediterranean. We also measured Hg residues in eggs of the one of the most endangered gull species in the world, the Audouin's gull (Larus audouinii) from the Ebro Delta, where colonies of yellow-legged and Audouin's gull co-occur. Fresh eggs were collected in 2009 and 2016 and samples were pooled from each colony for analysis. Mercury concentrations in yellow-legged gulls ranged between 0.4 and 2.8 mg/kg dry weight (dw); although there were no significant differences in concentrations between sampling periods, significant differences were found between colonies. Higher concentrations were associated with northern Mediterranean colonies (Columbretes and Ebro Delta), likely due to proximity to emission sources, circulatory marine currents and diet composition. Mercury concentrations in yellow-legged gull eggs were lower than those reported to result in impaired hatching. Residues in Audouin's gull eggs from the Ebro Delta were significantly higher (4.0-5.6 mg/kg dw) than those in yellow-legged gull from the same location, probably associated with dietary differences. Mercury levels in Audouin's gull were ten times above the benchmark suggested to reduce nest success by 10%. Overall, these results raise concern for adverse health impacts in this protected seabird species and further investigation in Audouin's gull eggs from the Ebro Delta is recommended.

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Section: Resultsmentioning

confidence: 99%

Temporal and Spatial Distribution of Mercury in Gulls Eggs from the Iberian Peninsula

Pereira

Lawlor

Bertolero³

et al. 2018

Arch Environ Contam Toxicol

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“…2. The device consists in a DGT piston (base) (a) and a DGT cap (e) with an exposure area of 3.14 cm 2 (Jolley et al 2016;Turull et al 2017b). Other components inside the DGT sampling device are shown in Fig.…”

Section: Device and Components Of Diffusive Gradient In Thin Filmsmentioning

confidence: 99%

“…The most used diffusive layer is APA hydrogel, which has an open pore size larger than 5 nm allowing the diffusion of molecules with molecular weights < 10 6 (i.e., fulvic acid and some of the humic acid) as well as its advantage of retaining stability in the range of pH 2-9 after 3.2 times swelling due to hydration (Wang et al 2016b). Some studies have been described the protocol for its preparation (Fernández-Gómez et al 2011;Turull et al 2017b), which consists on the addition of the cross-linker and acrylamide (or agarose derivative) to the water, followed by the addition of N,N,N′,N′-tetramethylethylenediamine solution, which catalyzes the reaction and the ammonium persulfate, which plays the role of initiator of the reaction. The polymerization is carried out at 42-45 °C for 45 min approximately, resulting in a layer which contains 15% monomer and 0.3% crosslinker, although the cross-linker structure of the commercial product is still unknown.…”

Section: Diffusive Gelsmentioning

confidence: 99%

“…Moreover, in other studies, the DGT devices have been attached with fishing line to a buoy (Pichette et al 2007;Clarisse et al 2009). The most common design for DGT deployment in natural waters consist of put in the DGTs inside a homemade cylindrical basket made of a plastic net, which is anchored to a rope with a weight on one end and a buoy on the other (Turull et al 2017b) (Fig. 4c).…”

Section: Deployment In Watermentioning

confidence: 99%

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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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“…The most important chemical forms are elemental Hg, inorganic Hg, monomethylmercury (MeHg), and dimethylmercury (DMHg), which are all toxic, making mercury probably one of the most hazardous pollutants to aquatic biota (Akagi and Nishimura, 1991;Mason, 1995;Baeyens et al, 2003). It enters the environment from natural and anthropogenic sources, with coalfired power plants, waste incinerators, and chlor-alkali plants as the most important ones (Turull et al, 2017b). Although mercury is essentially discharged in the inorganic form, it can be converted by sulfate reducing bacteria into methylmercury (MeHg), the most toxic mercury compound in the environment, bio-accumulated in plankton and biomagnified through the aquatic food chain (Mason, 1995;Storelli et al, 2002;Baeyens et al, 2003).…”

Section: Mercury Speciationmentioning

confidence: 99%

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

et al. 2021

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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.

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Phytochelatin synthesis in response to Hg uptake in aquatic plants near a chlor-alkali factory

Cited by 17 publications

References 32 publications

Temporal and Spatial Distribution of Mercury in Gulls Eggs from the Iberian Peninsula

Temporal and Spatial Distribution of Mercury in Gulls Eggs from the Iberian Peninsula

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

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

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