Cysteine-modified silica resin in DGT samplers for mercury and trace metals assessment

Reichstädter, Marek; Gao, Yue; Diviš, Pavel; Ma, Tianhui; Gaulier, Camille; Leermakers, Martine

doi:10.1016/j.chemosphere.2020.128320

Cited by 10 publications

(5 citation statements)

References 60 publications

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“…As shown in Figure S2, the mass of Hg(II) diffused into the binding gel increased linearly with respect to time ( R 2 > 0.999, p < 0.01, ANOVA). The estimated D DGT for Hg(II) calculated using eq S3 was 7.56 (±0.61) × 10 –6 cm 2 s –1 at 25 °C, consistent with previously reported values (6.19 × 10 –6 cm 2 s –1 ∼ 7.8 × 10 –6 cm 2 s –1 ). ,− The diffusion coefficients of Hg(II) in NSBA gel at different temperatures were calculated using eq S4.…”

Section: Resultssupporting

confidence: 88%

“…36 Others established that DGT resins are either not readily available commercially (e.g., Spheron− Thiol) or exhibit weak adsorption characteristics (e.g., Chelex-100). 8,22,30 In this study, we developed a novel DGT method for determining the concentration and isotopic composition of aqueous Hg(II). The DGT device was assembled using a binding resin containing aminopropyl and mercaptopropyl bifunctionalized SBA-15 nanoparticles (NSBA, SBA-15 is a mesoporous silica sieve with hexagonal pores and a tunable pore diameter of 5−15 nm).…”

Section: Introductionmentioning

confidence: 99%

“…Most DGT resins contain thiol (−SH) groups ( e.g. , Spheron–Thiol, Chelex-100 and 3-mercaptopropyl-functionalized silica) for capturing labile aqueous Hg species because of their strong affinity to Hg(II). ,, The 3-mercaptopropyl-functionalized silica (3-MFS) resin gel has been used for methylmercury determination. − Few studies used 3-MFS resin gel to monitor aqueous Hg(II) . Others established that DGT resins are either not readily available commercially ( e.g.…”

Section: Introductionmentioning

confidence: 99%

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Determination of the Isotopic Composition of Aqueous Mercury in a Paddy Ecosystem Using Diffusive Gradients in Thin Films

Yin,

Yao,

Yuan

et al. 2023

Anal. Chem.

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Measuring the isotopic composition of Hg in natural waters is challenging due to the ultratrace level of aqueous Hg (ng L–1). At least 5 ng of Hg mass is required for Hg isotopic analysis. Given the low Hg concentration in natural waters, a large volume of water (>10 L) is typically needed. The conventional grab sampling method is time-consuming, laborious, and prone to contamination during transportation and preconcentration steps. In this study, a DGT (diffusive gradients in thin films) method based on aminopropyl and mercaptopropyl bi-functionalized SBA-15 nanoparticles was developed and extended to determine the concentration and isotopic composition of aqueous Hg for the first time. The results of laboratory analysis showed that Hg adsorption by DGT induces ∼ −0.2‰ mass-dependent fractionation (MDF) and little mass-independent fractionation (MIF). The magnitude of MDF exhibits a dependence on the diffusion-layer thickness of DGT. Since Hg-MDF can occur in a broad range of environmental processes, monitoring the δ202Hg of aqueous Hg using the DGT method should be performed with caution. Field results show consistent MIF signatures (Δ199Hg) between the DGT and conventional grab sampling method. The developed DGT method serves as a passive sampling method that effectively characterizes the MIF of Hg in waters to understand the biogeochemical cycle of Hg at contaminated sites.

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Determination of the Isotopic Composition of Aqueous Mercury in a Paddy Ecosystem Using Diffusive Gradients in Thin Films

Yin,

Yao,

Yuan

et al. 2023

Anal. Chem.

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“…The LOD and LOQ of DGT were 0.071 µg•L −1 and 0.116 µg•L −1 , respectively. These values are comparable to the LODs and LOQs achieved using DGT with other binding gels containing Hgselective resins and TDA-AAS as an instrumental method [17], as well as to methods requiring the elution of Hg from the binding gel, such as inductively coupled plasma mass spectrometry and liquid chromatography coupled to cold vapour atomic fluorescence spectrometry methods [37,38]. Compared to direct analysis of fish sauce on TDA-AAS, LOD ten-times lower were achieved when preconcentrating the Hg by DGT.…”

Section: Validation Of Dgtsupporting

confidence: 57%

Determination of Mercury in Fish Sauces by Thermal Decomposition Gold Amalgamation Atomic Absorption Spectroscopy after Preconcentration by Diffusive Gradients in Thin Films Technique

Diviš

Reichstädter

Gao

et al. 2020

Foods

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The analysis of mercury in food presents a challenge for analytical chemists. Sample pre-treatment and the preconcentration of mercury prior to measurement are required, even when highly sensitive analytical methods are used. In this work, the Diffusive Gradients in Thin Films technique (DGT), combined with thermal decomposition gold amalgamation atomic absorption spectrometry (TDA-AAS), was investigated for the determination of the total dissolved mercury in fish sauces. Moreover, a new type of binding gel with Purolite S924 resin was used in DGT. Linearity assays for DGT provided determination coefficients around 0.995. Repeatability tests showed a relative standard deviation of less than 10%. pH values in the range of 3–6, as well as NaCl concentrations up to 50 g·L−1, did not affect the performance of DGT. The effective diffusion coefficient of mercury in five-fold diluted fish sauce was determined to be (3.42 ± 0.23)·10−6 cm2·s−1. Based on the 24 h deployment time of DGT, the limit of detection (LOD) for the investigated method was 0.071 µg·L−1. The proposed method, which combines DGT and TDA-AAS, allows for the analysis of fish sauces with mercury concentrations below the LOD of TDA-AAS, and significantly reduces the wear and corrosion of the TDA-AAS components.

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“…However, many of them are not or no longer commercially available due to interrupted production; only 3-mercaptopropylsilica (3-MFS) and Purolite S924 are still commercially available (Gao et al, 2011;Bratkic et al, 2019;Reichstädter et al, 2020). However, individual research groups have synthesized new home-made resins for assessment of Hg and other trace metal in aquatic systems (Gao et al, 2011;Turull et al, 2017a;Elias et al, 2020;Reichstädter et al, 2021). Due to the very strong binding between the functional groups of the resin and Hg, the elution procedures for Hg are also different from those for other trace metals (elution procedures can be found in Table 5).…”

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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Cysteine-modified silica resin in DGT samplers for mercury and trace metals assessment

Cited by 10 publications

References 60 publications

Determination of the Isotopic Composition of Aqueous Mercury in a Paddy Ecosystem Using Diffusive Gradients in Thin Films

Determination of the Isotopic Composition of Aqueous Mercury in a Paddy Ecosystem Using Diffusive Gradients in Thin Films

Determination of Mercury in Fish Sauces by Thermal Decomposition Gold Amalgamation Atomic Absorption Spectroscopy after Preconcentration by Diffusive Gradients in Thin Films Technique

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

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