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

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Colloidal stability of nanoparticles derived from simulated cloud-processed mineral dusts. / Kadar, Enikö; Fisher, Andrew; Stolpe, Bjorn; Calabrese, Sergio; Lead, Jamie; Valsami-jones, Eugenia; Shi, Zongbo.

In: Science of the Total Environment, Vol. 466-467, 01.01.2014, p. 864-870.

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@article{392d2604cbe24a3bb155639483e67383,
title = "Colloidal stability of nanoparticles derived from simulated cloud-processed mineral dusts",
abstract = "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 mMg− 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.",
author = "Enik{\"o} Kadar and Andrew Fisher and Bjorn Stolpe and Sergio Calabrese and Jamie Lead and Eugenia Valsami-jones and Zongbo Shi",
year = "2014",
month = jan,
day = "1",
doi = "10.1016/j.scitotenv.2013.07.119",
language = "English",
volume = "466-467",
pages = "864--870",
journal = "Science of the Total Environment",
issn = "0048-9697",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Colloidal stability of nanoparticles derived from simulated cloud-processed mineral dusts

AU - Kadar, Enikö

AU - Fisher, Andrew

AU - Stolpe, Bjorn

AU - Calabrese, Sergio

AU - Lead, Jamie

AU - Valsami-jones, Eugenia

AU - Shi, Zongbo

PY - 2014/1/1

Y1 - 2014/1/1

N2 - 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 mMg− 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.

AB - 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 mMg− 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.

U2 - 10.1016/j.scitotenv.2013.07.119

DO - 10.1016/j.scitotenv.2013.07.119

M3 - Article

C2 - 23978585

VL - 466-467

SP - 864

EP - 870

JO - Science of the Total Environment

JF - Science of the Total Environment

SN - 0048-9697

ER -