Estimation of diffusive boundary layer thickness in studies involving diffusive gradients in thin films (DGT)

Garmo, Ø. A.; Naqvi, K. Razi; Røyset, O.; Steinnes, E.
December 2006
Analytical & Bioanalytical Chemistry;Dec2006, Vol. 386 Issue 7/8, p2233
Academic Journal
Recent laboratory experiments and field investigations involving diffusive gradients in thin films (DGT) have shown that the thickness ( δ) of the diffusive boundary layer (DBL), which can affect the accuracy of the technique, is generally not negligible. Accordingly, the determination of δ has become a matter of considerable practical importance. Though the problem has been addressed in the recent literature, there is room for some improvement. An expression for estimation of δ is presented here, and a practical procedure for determining δ and the concentration of DGT-labile species from sparse experimental data is proposed and illustrated by analyzing data from four experiments with DGT samplers of different diffusive gel thicknesses.


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