Colloidal stability of nanoparticles derived from simulated cloud-processed mineral dusts

Kadar, E, Fisher, A, Stolpe, B, Calabrese, S, Lead, J, Valsami-Jones, E and Shi, Z 2014 Colloidal stability of nanoparticles derived from simulated cloud-processed mineral dusts. Science of The Total Environment, 466-46. 864-870.

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Laboratory simulation of cloud processing of three model dust types with distinct Fe-content (Moroccan dust, Libyan dust and Etna ash) and reference goethite and ferrihydrite were conducted in order to gain a better understanding of natural nanomaterial inputs and their environmental fate and bioavailability. The resulting nanoparticles (NPs) were characterised for Fe dissolution kinetics, aggregation/size distribution, micromorphology and colloidal stability of particle suspensions using a multi-method approach. We demonstrated that the: (i) acid-leachable Fe concentration was highest in volcanic ash (1 m Mg(-1) dust) and was followed by Libyan and Moroccan dust with an order of magnitude lower levels; (ii) acid leached Fe concentration in the<20 nm fraction was similar in samples processed in the dark with those under artificial sunlight, but average hydrodynamic diameter of NPs after cloud-processing (pH~6) was larger in the former; iii) NPs formed at pH~6 were smaller and less poly-disperse than those at low pH, whilst unaltered zeta potentials indicated colloidal instability; iv) relative Fe percentage in the finer particles derived from cloud processing does not reflect Fe content of unprocessed dusts (e.g. volcanic ash>Libyan dust). The common occurrence of Fe-rich "natural nanoparticles" in atmospheric dust derived materials may indicate their more ubiquitous presence in the marine environment than previously thought.

Item Type: Publication - Article
Additional Keywords: Atmospheric deposition; Dissolution; Ferrihydrite; Nanoparticle
Subjects: Ecology and Environment
Marine Sciences
Divisions: Plymouth Marine Laboratory > Science Areas > Sea and Society
Depositing User: Mrs Julia Crocker
Date made live: 05 Aug 2014 14:50
Last Modified: 06 Jun 2017 16:12

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