Applicability of Montmorillonite Immobilized in Hydrogel for the Determination of Labile Cd, Pb, Mn, and Zn in Water Using Diffusive Gradient in Thin Films (DGT)

Nguyen, Hong Lien; Phung, Anh Tuan; Chu, Thi Hai Nam; Nguyễn, Anh Vũ; Nguyen, Han Long; La, Bich Huong

doi:10.1007/s11270-020-04474-5

Cited by 5 publications

(2 citation statements)

References 49 publications

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“…Before use, montmorillonite was treated with HNO 3 acid (Pro Analysis, Merck) and then saturated with NaNO 3 (99.5%, Merck) as described in [42]. In brief, 10 g of MMT was soaked in 100 mL of HNO 3 (1 mol•L −1 ) for 2 h, and then, it was centrifuged and washed with ultrapure water.…”

Section: 1mentioning

confidence: 99%

“…In our previous study [42], MMT K10 was impregnated in a polyacrylamide hydrogel and used as the binding phase in the DGT technique for the determination of Cd, Pb, Mn, and Zn in standard solutions. e results showed that the DGT modified with MMT as a new binding phase is suitable for the determination of labile trace metals in water samples, but its performance with natural water samples collected from real environments needs to be evaluated.…”

Section: Introductionmentioning

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: 1mentioning

confidence: 99%

Section: Introductionmentioning

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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Friedel-crafts acylation of furan using chromium-exchanged dodecatungstophosphoric acid: effect of support, mechanism and kinetic modelling

Desai

Yadav

2021

Clean Techn Environ Policy

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The Friedel-Crafts acylation of furan with acetic anhydride to produce 2-acyl furan is industrially important. With an aim of replacing the highly polluting process, it this study, supported but modi ed heteropoly acids were used. Metal exchanged dodecatungstophosphoric acid (DTP) was loaded on three different supports and its effect on acylation was evaluated. Thus, chromium exchanged DTP was supported on K-10, SiO 2 , and ZrO 2 using the incipient wetness impregnation method. 20% w/w Cr 0.66 -DTP/K-10 having the best activity for the acylation of furan with acetic anhydride was chosen for full characterization and reaction kinetics. Under optimized condition, the catalyst to furan ratio was 9.6%,

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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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Applicability of Montmorillonite Immobilized in Hydrogel for the Determination of Labile Cd, Pb, Mn, and Zn in Water Using Diffusive Gradient in Thin Films (DGT)

Cited by 5 publications

References 49 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

Friedel-crafts acylation of furan using chromium-exchanged dodecatungstophosphoric acid: effect of support, mechanism and kinetic modelling

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

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