Sensitivity improvement of thin-film techniques by micro-sample analysis. - Archive ouverte HAL Accéder directement au contenu
Poster De Conférence Année : 2019

Sensitivity improvement of thin-film techniques by micro-sample analysis.

Résumé

Two types of thin-film techniques have been developed in the 90’s by W. Davison and H. Zhang, known under the name of DET (diffusive equilibrium in thin film) and DGT (diffusive gradient in thin film) technique. The solutes are equilibrated with the non-bound water of the hydrogel for the DET technique, whereas the solutes diffuse through a diffusive hydrogel before being accumulated by a binding gel for the DGT techniques. Elution of solutes is required for some chemical analysis. The analysis volume depends on the analytical tool consumption, such as 2-10 mL for classical elemental analysis, which is critical to the solute determination at trace levels in dilute eluent solution. Solute dilution is eventually compensated by its preconcentration with the DGT technique, contrary to the DET techniques. That’s a reason why the DGT application is currently most popular in environmental studies. Our laboratory has been recently equipped with a Tedelyne-Cetac MVX 7100 µL workstation (http://www.teledynecetac.com), which allows determining solute concentrations in small sample sizes (volumes ranging between 5 and 500 µL) once hyphenated to the Agilent 8800 ICP-MS/MS. The possibility to analyze small sample volumes meets the requirements of thin-film techniques notably by reducing to the minimum the volume of the eluent solution and thus by leading to the improvement of the technique sensitivity. However, ICP-MS/MS settings for analysis of small volumes are not a trivial issue. In this work, a number of key parameters such as sample flow rate, element integration time, number of replicates, were carefully evaluated and improved. The optimized performances of the MVX 7100 µL-ICP-MS/MS in terms of signal sensibility and stability were compared to the Agilent ALS-ICP-MS/MS (classical autosampler provided by the manufacturer). The developed method was applied for the determination of element concentrations (Fe, Mn and U) in pore waters of French river sediments. DET and Chelex-DGT devices were deployed simultaneously in river sediments. The DET samples were analyzed using the developed method, whereas Chelex-DGT samples were treated and analyzed using a classical protocol. Finally, a depth profile comparison between the two thin-film techniques will be presented and discussed.
Fichier principal
Vignette du fichier
0000162512_001.PDF (6.62 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-02460188 , version 1 (29-01-2020)

Licence

Copyright (Tous droits réservés)

Identifiants

  • HAL Id : hal-02460188 , version 1

Citer

Josselin Gorny, Hugo Jaegler, Florian Brulfert, Alkiviadis Gourgiotis, Mathilde Zebracki. Sensitivity improvement of thin-film techniques by micro-sample analysis.. Diffusive gradients in thin films Conference 2019, Diffusive gradients in thin films Conference 2019, Sep 2019, VIENNE, Austria. 2019. ⟨hal-02460188⟩
55 Consultations
59 Téléchargements

Partager

Gmail Facebook X LinkedIn More