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

Cindrić, Ana-Marija; Marcinek, Saša; Garnier, Cédric; Salaün, Pascal; Cukrov, Neven; Oursel, Benjamin; Lenoble, Véronique; Omanović, Dario

doi:10.1016/j.scitotenv.2020.137784

Cited by 26 publications

(20 citation statements)

References 88 publications

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“…ose significant differences in the labile Cu fraction measured by DGT and ASV might be originated from the slow dissociation kinetics of very strong complexes of Cu with organic ligands [49,50]. However, for the cases of Mn, Zn, Pb, and Cd, their weak complexes with organic matters may not highly affect the measurement of ASV [49,51]. is may explain the equivalent results measured by DGT and ASV in the present study as observed.…”

Section: Comparison Between Dgt and The Anodic Strippingsupporting

confidence: 55%

“…For examples, Cindríc et al [49] found that ASV-labile concentration was 35% lower than that of the DGT labile during analysis of labile Cu in estuarine water, whereas Zhang and Davison [48] reported higher ASV concentrations compared to the DGT data when labile Cu was determined in natural water containing humic substances. ose significant differences in the labile Cu fraction measured by DGT and ASV might be originated from the slow dissociation kinetics of very strong complexes of Cu with organic ligands [49,50]. However, for the cases of Mn, Zn, Pb, and Cd, their weak complexes with organic matters may not highly affect the measurement of ASV [49,51].…”

Section: Comparison Between Dgt and The Anodic Strippingmentioning

confidence: 99%

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Evaluating the Performance of a Diffusive Gradient in Thin Film Embedded with Montmorillonite for the Determination of Labile Cd, Pb, Mn, and Zn in Natural River Water

Nguyen

Phung

Tran

et al. 2020

Journal of Chemistry

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Montmorillonite (MMT), a natural clay mineral with high ion-exchange capacity and trace metal adsorbability, has been demonstrated to be a suitable binding phase in the diffusive gradient in thin film (DGT) technique for the determination of labile trace metals in synthetic water samples. However, in situ working performance of DGT-MMT with natural river water has not yet been investigated. The present study examined the performance of a DGT containing montmorillonite (MMT) for the in situ isolation and determination of labile Cd, Pb, Mn, and Zn fractions in Lach Tray River water, North Vietnam. The repeatability and accuracy of the DGT-MMT probe were assessed on the basis of seven measurement replicates performed on Cd2+, Pb2+, Mn2+, and Zn2+ standard solutions. Then, the DGT-MMT probes were deployed in Lach Tray River water at different sampling sites to determine the labile metal fractions present in river water. By comparing the total and dissolved metal concentrations in the river water, the distributions of the four tested trace metals were constructed. The proportions of the dissolved fractions of Cd, Pb, Mn, and Zn were 46.7–73.7%, 38.5–63.9%, 36.4–41.6%, and 49.8–67.7%, respectively. The results also showed that the high accuracy and reproducibility of the DGT-MMT data were comparable with measurements obtained by the commonly used DGT-Chelex-100 method. In comparison with the data obtained from anodic stripping voltammetry (ASV), a traditional technique for the determination of non-in situ speciation of trace metals, labile metal concentrations measured by DGT-MMT were in similar ranges. These findings indicate that naturally available montmorillonite can be used as an alternative binding material in DGT probes for the in situ determination of labile metal concentrations in natural watercourses.

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Section: Comparison Between Dgt and The Anodic Strippingsupporting

confidence: 55%

Section: Comparison Between Dgt and The Anodic Strippingmentioning

confidence: 99%

Evaluating the Performance of a Diffusive Gradient in Thin Film Embedded with Montmorillonite for the Determination of Labile Cd, Pb, Mn, and Zn in Natural River Water

Nguyen

Phung

Tran

et al. 2020

Journal of Chemistry

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“…By just taking all lability degrees at their maximum values (ξ j = 1), Equation (3) reverts to the useful and widely-used concept of "maximum dynamic concentration" (Unsworth et al, 2006;Balistrieri and Blank, 2008;Bradac et al, 2009;Warnken et al, 2009;Davison and Zhang, 2012;Han et al, 2014;Zhang and Davison, 2015;Zhu and Gueguen, 2016;Macoustra et al, 2019;Cindric et al, 2020),…”

Section: Diffusive Gradient In Thin-films Techniquementioning

confidence: 99%

“…Concentrations of labile complexes can be assessed using another set of techniques. Some of them, like ASV or SSCP (van Leeuwen and Town, 2003;Town and van Leeuwen, 2019;Cindric et al, 2020), are of voltammetric nature, but there is an increasing use of techniques based on membranes. These techniques involve the dissociation of the labile complexes followed by the non-reversible trapping of the released ions in a solid substrate such as a resin.…”

Section: Introductionmentioning

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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“…The water column and the sediments of both, the freshwater part, and the estuarine segment were quite well characterized on the distribution and dynamics of the trace metal, however none of the study involved determination of Re. The anthropogenic influence was found in the upper most segment of the freshwater part due to the input of municipal and/or industrial non-treated waste waters around the town of Knin (Cukrov et al 2008a;2008b), while a nautical tourism was linked to increased concentrations of some trace elements during summer season in the estuary (Cindrić et al 2015;Cindrić et al 2020). The harbor activities and old ferromanganese factory were identified as a recent and historical source of pollution of elements in sediment at selected locations within the estuary (Cukrov et al 2008a;Cukrov et al 2020).…”

Section: Study Sitementioning

confidence: 99%

Rhenium distribution and behaviour in the salinity gradient of a highly stratified estuary and pristine riverine waters

Bura-Nakić

Knežević

Mandić

et al. 2021

Preprint

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The abundance and distribution of dissolved Re (DRe) has been determined in the freshwater part of the Krka River (Croatia), draining the karstic carbonate landscape, as well as in the salinity gradient of its highly stratified estuary. Due to low DRe concentration, the batch procedure consisting of pre-concentration step using an anion exchange resin (Dovex) and analysis of DRe in 8 M HNO 3 eluate using a high resolution inductively coupled plasma mass spectrometry (HR ICP-MS) was adopted. Due to the potential inconsistent recoveries, ranging from 60% to 87%, the quantification was performed by using the isotope dilution (ID) technique. The DRe concentration in the Krka River basically increased in the downstream direction, with the 6.2 pM at the spring site, reaching 11.9 pM before the estuarine region. The weathering of the surrounding carbonate lithology is assumed as the source of natural Re. The two specific anomalies were registered: a strong increase in DRe concentration due to the anthropogenic input near the town of Knin (27.5 pM) and a decrease at downstream site caused by the subterranean input of freshwater of the Zrmanja River leading to relatively low DRe concentration (8.5 pM). In the estuarine segment, a near-conservative behavior of DRe was found in the salinity gradient of the upper surface layer, with the DRe concentration ranging from 18 to 38 pM. An anthropogenic supply was suggested within the estuarine segment close to the urban area causing a small positive deviation from the conservative line. In the bottom seawater layer, a minor decrease of DRe concentration in the most upstream estuarine regions was evidenced, implying a potential weak scavenging of Re.

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

Cited by 26 publications

References 88 publications

Evaluating the Performance of a Diffusive Gradient in Thin Film Embedded with Montmorillonite for the Determination of Labile Cd, Pb, Mn, and Zn in Natural River Water

Evaluating the Performance of a Diffusive Gradient in Thin Film Embedded with Montmorillonite for the Determination of Labile Cd, Pb, Mn, and Zn in Natural River Water

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

Rhenium distribution and behaviour in the salinity gradient of a highly stratified estuary and pristine riverine waters

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