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University of Crete (2017)

Kinetic investigation of gaseous HCl heterogeneous interaction with surfaces of desert dust and potential impact on metals solubility

Foutouli Zoe P. Φουτούλη, Ζωή Π.

Titre : Kinetic investigation of gaseous HCl heterogeneous interaction with surfaces of desert dust and potential impact on metals solubility

Κινητική διερεύνηση ετερογενούς αλληλεπίδρασης αερίου HCl με επιφάνειες ερημικής σκόνης και πιθανές επιπτώσεις της στη διαλυτότητα των μετάλλων

Auteur : Foutouli Zoe P. Φουτούλη, Ζωή Π.

Etablissement de soutenance : University of Crete

Grade : Master of Science Thesis 2017

Résumé
In the present MSc dissertation, the heterogeneous interaction of gaseous HCl with Saudi Arabia dust surfaces, was studied. The title interaction might plays a key-role in the atmosphere, as well as in multiple environmental processes, due to that gaseous HCl adsorption on particles might be both an important sink that determines its atmospheric abundance and an indirect factor, via particles precipitation, that enhances eutrophication. Experiments carried out using a continuous flow system equipped with a Knudsen reactor ensuring very low pressure conditions (Very Low Pressure Reactor, VLPR) and a quadrupole mass spectrometer, QMS, used to analyse the modulated effusive molecular beam that exits the reactor. Experiments performed in temperature range 253 – 296 Κ, simulating Marine Boundary Layer (MBL) and the lower atmosphere’s temperatures. Under those conditions, gaseous HCl affinity with dust surface was studied via initial uptake coefficient (γ0) determination, as well as HCl adsorption probability on the surface available sites via measuring the number of molecules that are attached on the surface, Ns (surface coverage, θ = Νs/Nmax) and the related isotherms. Both γ0 and Ns are of great importance, since they provide with information about the adsorption mechanism and can be used to investigate the impact on dust constituents’ solubility in the ocean. Therefore, they are critically related with one of the most severe threads for the oceanic environment and the sea waters that is eutrophication.

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