Non-labile silver species in biosolids remain stable throughout 50 years of weathering and ageing
Date
2015
Authors
Donner, E.
Scheckel, K.
Sekine, R.
Popelka Filcoff, R.S.
Bennett, J.W.
Brunetti, G.
Naidu, R.
McGrath, S.P.
Lombi, E.
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Journal article
Citation
Environmental Pollution, 2015; 205:78-86
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Abstract
Increasing commercial use of nanosilver has focussed attention on the fate of silver (Ag) in the wastewaterrelease pathway. This paper reports the speciation and lability of Ag in archived, stockpiled, andcontemporary biosolids from the UK, USA and Australia, and indicates that biosolids Ag concentrationshave decreased significantly over recent decades. XANES revealed the importance of reduced-sulfurbinding environments for Ag speciation in materials ranging from freshly produced sludge to biosolidsweathered under ambient environmental conditions for more than 50 years. Isotopic dilution with110mAg showed that Ag was predominantly non-labile in both fresh and aged biosolids (13.7% meanlability), with E-values ranging from 0.3 to 60 mg/kg and 5 mM CaNO3 extractable Ag from 1.2 to 609 mg/kg (0.002e3.4% of the total Ag). This study indicates that at the time of soil application, biosolids Ag willbe predominantly Ag-sulfides and characterised by low isotopic lability.
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Data source: Supplementary data, http://www.sciencedirect.com/science/article/pii/S026974911500250X#appd001
Link to a related website: https://research-repository.griffith.edu.au/bitstream/10072/382407/1/SekinePUB491.pdf, Open Access via Unpaywall
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Copyright 2015 Elsevier