Determination of diffusion coefficients in agarose and polyacrylamide gels for 112 organic chemicals for passive sampling by organic Diffusive Gradients in Thin films (o-DGT) - RIVERLY Accéder directement au contenu
Article Dans Une Revue Environmental Science and Pollution Research Année : 2021

Determination of diffusion coefficients in agarose and polyacrylamide gels for 112 organic chemicals for passive sampling by organic Diffusive Gradients in Thin films (o-DGT)

Résumé

The diffusive gradient in thin film technique was recently adapted to organic compounds. The diffusional coefficient (D) is a key parameter needed to calculate the time-weighted average concentration. In this study, two methods are used for D measurement in two gels (agarose and polyacrylamide): the diffusion cell method (D-cell) and the slice stacking method (D-stack). Thus, D were discussed and compared for 112 organic compounds, including pesticides, hormones, and pharmaceuticals. D-stack tends to be higher than D-cell. It could be explained by the presence of a non-negligible diffusive boundary layer thickness in diffusion cell. Consequently, the use of sampling rates (R-S) should be more adequate to determine water concentration, for a given bulk flow velocity. D-stack also corresponds to the diffusion in gel only, allowing the determination of the maximal R-S, and would be considered as a reference value that can be adjusted to in situ conditions, by applying the appropriate DBL thickness. The range and variability of D values found in the literature and obtained in this work were discussed. Relationships between D and compound physicochemical properties (molecular mass, log Dow, polar surface area, van der Waals volume) were investigated. We did not find clear and robust correlation between D and any single physicochemical property, for the set of compounds tested.
Fichier non déposé

Dates et versions

hal-03515101 , version 1 (06-01-2022)

Licence

Paternité

Identifiants

Citer

Bertille Bonnaud, Cecile Miege, Amandine Daval, Vincent Fauvelle, Nicolas Mazzella. Determination of diffusion coefficients in agarose and polyacrylamide gels for 112 organic chemicals for passive sampling by organic Diffusive Gradients in Thin films (o-DGT). Environmental Science and Pollution Research, 2021, 29 (17), pp.25799-25809. ⟨10.1007/s11356-021-17563-7⟩. ⟨hal-03515101⟩
50 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More