Metals in the Aquatic Environment—Interactions and Implications for the Speciation and Bioavailability: A Critical Overview

Domingos, Rute F.; Gélabert, Alexandre; Carreira, Sara; Cordeiro, Ana; Sivry, Yann; Benedetti, Marc F.

doi:10.1007/s10498-014-9251-x

Cited by 29 publications

(14 citation statements)

References 139 publications

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“…biotic ligands, inorganic species) or particles (e.g. humic substances, iron manganese oxides, clays) can significantly impact their bioavailability and toxicity (Sunda & Huntsman 1998, Meyer et al 1999, Domingos et al 2015. Ligand composition was not measured in this study, but it is possible that the sediment or the organism itself altered the composition of metal-chelating agents in the media and caused free Ni to become complexed (Sunda & Huntsman 1998, Sunda et al 2005.…”

Section: Discussionmentioning

confidence: 87%

“…Determining the cause of the toxicity response in the CO 2 /sediment incubation experiment is not straightforward. Many predictions of trace metal bioavailability assume that the concentration of the free metal ion drives uptake and toxicity (Sunda & Huntsman 1998, Domingos et al 2015. Therefore, free metal Cd and Ni concentrations were compared in the CO 2 /sediment incubation experiment and the Cd and Ni toxicity bioassay experiments (Table 2).…”

Section: Discussionmentioning

confidence: 99%

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Elevated toxic effect of sediments on growth of the harmful dinoflagellate Cochlodinium polykrikoides under high CO2

Bausch¹,

Boatta²,

Morton³

et al. 2017

Aquat. Microb. Ecol.

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Ocean acidification will likely have significant impacts on phytoplankton growth in marine ecosystems over the course of this century. Coastal waters, which can be strongly influenced by suspended sediments, can also be particularly sensitive to ocean acidification. While the individual effects of trace metal inputs and ocean acidification have each been well documented, the combined effects of high trace metal concentrations due to mobilization from sediments and high dissolved CO 2 concentrations (low seawater pH) on the growth of marine phytoplankton are not known. In this study, a batch culture experiment was performed using the model organism Cochlodinium polykrikoides over 35 d under a range of CO 2 concentrations (400, 800, and 1200 ppmv) following sediment additions. At high CO 2 , dissolved iron (Fe) and nickel (Ni) concentrations increased over time. Dissolved Ni concentrations were significantly higher after 35 d at 1200 ppmv CO 2 compared to the other treatments and corresponded to significant decreases in C. polykrikoides growth rates. In addition, a toxicity bioassay experiment was performed over 29 d under a range of Ni or cadmium (Cd) concentrations at ambient CO 2. The growth responses of C. polykrikoides were dose-dependent and were significantly lower under increasing Ni or Cd concentrations. The findings suggest that a combination of elevated total dissolved Ni supplied from sediments and high CO 2 conditions could suppress the growth rates and photosynthesis of C. polykrikoides in coastal marine ecosystems. This is the first study to examine the synergistic, toxic effects of lithogenic trace metals and CO 2 on phytoplankton growth.

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Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Elevated toxic effect of sediments on growth of the harmful dinoflagellate Cochlodinium polykrikoides under high CO2

Bausch¹,

Boatta²,

Morton³

et al. 2017

Aquat. Microb. Ecol.

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“…the assessment of which species and to which extent do they contribute to the fluxes. Comprehensive reviews of the main developments of dynamic and equilibrium techniques have been recently published [12,[16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Comparison of different speciation techniques to measure Zn availability in hydroponic media

Companys

Galceran

Puy

et al. 2018

Analytica Chimica Acta

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Four analytical techniques are compared: AGNES (Absence of Gradients and Nernstian Equilibrium Stripping), LASV (Anodic Stripping Voltammetry with Linear stripping), DGT (Diffusive Gradients in Thin films) and PIM (Polymer Inclusion Membranes). These techniques have been designed to provide the free ion concentration or a labile fraction, complementarily contributing to an integrated description of speciation and availability. Their simultaneous application to the determination of free Zn concentrations or labile fluxes in seven solutions of a hydroponic medium reveals characteristics of each technique and correlations between their results. All dynamic results can be interpreted in terms of a general theoretical framework on fluxes. Indeed, in techniques under diffusion-limited conditions in the sample, the flux can be split into the free contribution (linearly proportional to the free fraction), plus the contribution of the complexes (where mobility, lability and abundance of complexation are intertwined). A methodology to compute lability degrees is developed. Measurements with PIM devices confirm that diffusion in the sample solution is not rate limiting, so its flux is proportional to the free metal in the donor solution. A proportionality between the responses of any given two techniques is observed, which suggests that, for the low ligand-to-metal concentration ratios used in the present work, any of these techniques would correlate similarly with uptake, toxic or nutritional measurements.

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“…These include potentiometry with ion-selective electrodes (ISEs) [2], the Donnan membrane technique (DMT) [3], the permeable liquid membrane (PLM) [4,5], the ion-exchange technique (IET) [6], and the absence of gradients and Nernstian equilibrium stripping technique (AGNES) [7]. Reviews of these (and other) techniques are available [8][9][10]. Although all these techniques have the ability to measure the free metal ion concentration, each of them has its own limitations.…”

Section: Introductionmentioning

confidence: 99%

AGNES at vibrated gold microwire electrode for the direct quantification of free copper concentrations

Domingos

Carreira

Galceran

et al. 2016

Analytica Chimica Acta

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The free metal ion concentration and the dynamic features of the metal species are recognized as key to predict metal bioavailability and toxicity to aquatic organisms. Quantification of the former is, however, still challenging. In this paper, it is shown for the first time that the concentration of free copper (Cu(2+)) can be quantified by applying AGNES (Absence of Gradients and Nernstian equilibrium stripping) at a solid gold electrode. It was found that: i) the amount of deposited Cu follows a Nernstian relationship with the applied deposition potential, and ii) the stripping signal is linearly related with the free metal ion concentration. The performance of AGNES at the vibrating gold microwire electrode (VGME) was assessed for two labile systems: Cu-malonic acid and Cu-iminodiacetic acid at ionic strength 0.01 M and a range of pH values from 4.0 to 6.0. The free Cu concentrations and conditional stability constants obtained by AGNES were in good agreement with stripping scanned voltammetry and thermodynamic theoretical predictions obtained by Visual MinteQ. This work highlights the suitability of gold electrodes for the quantification of free metal ion concentrations by AGNES. It also strongly suggests that other solid electrodes may be well appropriate for such task. This new application of AGNES is a first step towards a range of applications for a number of metals in speciation, toxicological and environmental studies for the direct determination of the key parameter that is the free metal ion concentration.

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Metals in the Aquatic Environment—Interactions and Implications for the Speciation and Bioavailability: A Critical Overview

Cited by 29 publications

References 139 publications

Elevated toxic effect of sediments on growth of the harmful dinoflagellate Cochlodinium polykrikoides under high CO2

Elevated toxic effect of sediments on growth of the harmful dinoflagellate Cochlodinium polykrikoides under high CO2

Comparison of different speciation techniques to measure Zn availability in hydroponic media

AGNES at vibrated gold microwire electrode for the direct quantification of free copper concentrations

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