Non-labile silver species in biosolids remain stable throughout 50 years of weathering and ageing

A - Papers appearing in refereed journals

Donner, E., Scheckel, K., Sekine, R., Popelka-Filcoff, R. S., Bennett, J. W., Brunetti, G., Naidu, R., McGrath, S. P. and Lombi, E. 2015. Non-labile silver species in biosolids remain stable throughout 50 years of weathering and ageing. Environmental Pollution. 205 (October), pp. 78-86.

AuthorsDonner, E., Scheckel, K., Sekine, R., Popelka-Filcoff, R. S., Bennett, J. W., Brunetti, G., Naidu, R., McGrath, S. P. and Lombi, E.
Abstract

Increasing commercial use of nanosilver has focussed attention on the fate of silver (Ag) in the wastewater release pathway. This paper reports the speciation and lability of Ag in archived, stockpiled, and contemporary biosolids from the UK, USA and Australia, and indicates that biosolids Ag concentrations have decreased significantly over recent decades. XANES revealed the importance of reduced-sulfur binding environments for Ag speciation in materials ranging from freshly produced sludge to biosolids weathered under ambient environmental conditions for more than 50 years. Isotopic dilution with 110mAg showed that Ag was predominantly non-labile in both fresh and aged biosolids (13.7% mean lability), with E-values ranging from 0.3 to 60 mg/kg and 5 mM CaNO3 extractable Ag from 1.2 to 609 μg/kg (0.002–3.4% of the total Ag). This study indicates that at the time of soil application, biosolids Ag will be predominantly Ag-sulfides and characterised by low isotopic lability.

KeywordsSilver; Biosolids; XANES; Speciation; Isotopic dilution; E-values
Year of Publication2015
JournalEnvironmental Pollution
Journal citation205 (October), pp. 78-86
Digital Object Identifier (DOI)doi:10.1016/j.envpol.2015.05.017
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeDelivering Sustainable Systems (SS) [ISPG]
Transatlantic initiative for nanotechnology and the environment (TINE)
Output statusPublished
Publication dates
Online26 May 2015
Publication process dates
Accepted07 May 2015
Copyright licensePublisher copyright
ISSN0269-7491
PublisherElsevier Sci Ltd

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