Abstract：
:For the interpretation of stable isotope ratio trends in saturated geochemical systems, the magnitude of aqueous phase diffusion-induced isotope fractionation needs to be known. This study reviews how five diffusion models (Fick, Maxwell-Stefan, Einstein, Langevin, Mode-Coupling Theory Analysis (MCTA) of diffusion) predict isotope fractionation due to aqueous phase diffusion and compares them with experimental results. The reviewed diffusion models were not consistent regarding the prediction of the mass (m) dependency of the aqueous phase diffusion coefficient (D). The predictions range from a square root power law (D ∝ m-0.5) to an opposite mass dependency of D (D ∝ mβ). Experimental studies exhibited consistently a weak power law mass dependency of the diffusion coefficient (D ∝ m-β with β < 0.5) for the vast majority of dissolved species and a larger diffusion-induced isotope effect for low weight noble gases (D ∝ m-0.5). The weak power law mass dependency of D for the species other than low weight noble gases is consistent with the MCTA of diffusion. The MCTA suggests that the weak power law mass dependency of D originates from interplays between strongly mass dependent short-term and mass independent long-term solute-solvent interactions. The larger isotope fractionation for low weight noble gases could be attributed to quantum isotope effects significantly magnifying the aqueous phase diffusion-induced isotope fractionation. Our review shows, that except for low weight noble gases a weak power law mass dependency of D is likely the most adequate assumption for aqueous phase diffusion-induced isotope fractionation in geochemical systems.
journal_name
Chemospherejournal_title
Chemosphereauthors
Wanner P,Hunkeler Ddoi
10.1016/j.chemosphere.2018.12.038subject
Has Abstractpub_date
2019-03-01 00:00:00pages
1032-1043eissn
0045-6535issn
1879-1298pii
S0045-6535(18)32360-9journal_volume
219pub_type
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