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Record number 411335
Title Steady-state DGT fluxes of nanoparticulate metal complexes
Author(s) Leeuwen, H.P. van
Source Environmental Chemistry 8 (2011)5. - ISSN 1448-2517 - p. 525 - 528.
Department(s) Physical Chemistry and Colloid Science
Publication type Refereed Article in a scientific journal
Publication year 2011
Keyword(s) in-situ measurements - speciation analysis - thin-films - dialysis - kinetics - dgt/det - det/dgt - det
Abstract For a fully labile complex system, the diffusive gradients in thin film (DGT) metal flux approaches the fairly simple limit defined by the joint diffusion of the free metal ion and the complex species in the gel layer. Natural soft nanoparticulate complexes, such as those with humics and fulvics, generally enter the DGT gel phase and some of them may even be adsorbed by the gel matrix. The time characteristics of the DGT response are affected by a lower rate of diffusion, as well as by possible accumulation of nanoparticulate species in the gel layer. Several cases are discussed in some detail on the basis of numerical analysis of the diffusion process. If the difference between the diffusion coefficients of the free metal ion and the nanoparticulate complex is sufficiently large, the time-resolved DGT flux allows for distinction between these two types of species
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