Developments in the diffusive gradients in thin-films technique for the speciation of oxyanions and platinum group elements in aquatic systems

Diffusive Gradients in Thin-films (DGT) is an in situ passive sampler with a widespread use in environmental studies. Within the ample range of analytes that can be probed with DGT, this review focuses on oxyanions and platinum group elements (PGEs). Ferrihydrite, zirconia, titanium dioxide and thio...

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Published in:TrAC, Trends in analytical chemistry (Regular ed.) Trends in analytical chemistry (Regular ed.), 2022-02, Vol.147, p.116513, Article 116513
Main Authors: Gao, Yue, Zhou, Chunyang, Galceran, Josep, Rey-Castro, Carlos, Puy, Jaume, Baeyens, Willy, Leermakers, Martine
Format: Article
Language:English
Subjects:
Aquatic systems
DGT
Labile
Oxyanions
Platinum group
Speciation
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Summary:Diffusive Gradients in Thin-films (DGT) is an in situ passive sampler with a widespread use in environmental studies. Within the ample range of analytes that can be probed with DGT, this review focuses on oxyanions and platinum group elements (PGEs). Ferrihydrite, zirconia, titanium dioxide and thiol-functionalized silica solid phases have been typically used as binding agents in DGT devices for oxyanions. DGT for PGEs had to overcome challenging interference problems during IPC-MS measurement of eluates, as well as slow equilibration kinetics in the bulk solution after spiking. This review summarizes the most recent analytical advances concerning the development and application of DGT with these target element groups, and points to the remaining knowledge gaps. •Zirconia and titanium oxide based binding gels allow quantification of oxyanions.•Redox speciation of As, Cr, Sb and Se is possible using appropriate binding gels.•Fe oxide based binding gels are suited to bind several organic P compounds.•Agarose was the preferred diffusive gel in the DGT for PGEs accumulation.•Resins used for PGEs are Purolite S920 (isothioureum) and AG MP-1 (anion exchange).
ISSN:0165-9936
1879-3142
DOI:10.1016/j.trac.2021.116513