PALESTRA NO ÂMBITO DO PROJETO RES2VALHUM
Jose Paulo Pinheiro
Ecole Nationale Supérieure de Géologie
Lab. Interdisciplinaire des Environnements Continentaux, Université de Lorraine
ANFITEATRO ESCOLA DE CIÊNCIAS
12 de Dezembro 2018
On the heterogeneity of metal binding by humic matter
Understanding and quantifying the chemical heterogeneity of metal ions complexation with humic matter as been one of the most daunting challenges regarding the fate of trace metals in natural waters.
Effectivelly only a small portion of the total dissolved metal exists as free hydrated cations because metal ions form stable complexes with a large variety of dissolved inorganic and organic ligands and also adsorbs onto colloids and suspended matter while also interacting with micro-organisms.
Some modelling approaches have been sucessfull describing the experimental results, like the NICA or WHAM models, nevertheless obtaining good quality experimental data is both difficult and time consuming.
As the main goal of the presentation discuss in detail the potential and the limitations of a novel aproach of experimentally acess the heterogeneity using the nersntian region of a Scanning Stripping Chronopotentiometry (SSCP) curve and compare the results with the ones obtained by traditional metal titrations.