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Int. J. Environ. Res. Public Health 2015, 12(9), 11724-11755; doi:10.3390/ijerph120911724

The Potential of Sequential Extraction in the Characterisation and Management of Wastes from Steel Processing: A Prospective Review

School of Science & Sport, University of the West of Scotland, Paisley Campus, Paisley PA1 2BE, UK
These authors contributed equally to this work.
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Author to whom correspondence should be addressed.
Academic Editor: Oladele A. Ogunseitan
Received: 1 July 2015 / Revised: 1 September 2015 / Accepted: 9 September 2015 / Published: 18 September 2015
(This article belongs to the Special Issue Hazardous Waste and Human Health)
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Abstract

As waste management regulations become more stringent, yet demand for resources continues to increase, there is a pressing need for innovative management techniques and more sophisticated supporting analysis techniques. Sequential extraction (SE) analysis, a technique previously applied to soils and sediments, offers the potential to gain a better understanding of the composition of solid wastes. SE attempts to classify potentially toxic elements (PTEs) by their associations with phases or fractions in waste, with the aim of improving resource use and reducing negative environmental impacts. In this review we explain how SE can be applied to steel wastes. These present challenges due to differences in sample characteristics compared with materials to which SE has been traditionally applied, specifically chemical composition, particle size and pH buffering capacity, which are critical when identifying a suitable SE method. We highlight the importance of delineating iron-rich phases, and find that the commonly applied BCR (The community Bureau of reference) extraction method is problematic due to difficulties with zinc speciation (a critical steel waste constituent), hence a substantially modified SEP is necessary to deal with particular characteristics of steel wastes. Successful development of SE for steel wastes could have wider implications, e.g., for the sustainable management of fly ash and mining wastes. View Full-Text
Keywords: sequential extraction; chemical speciation; steel wastes; regulation sequential extraction; chemical speciation; steel wastes; regulation
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Rodgers, K.J.; Hursthouse, A.; Cuthbert, S. The Potential of Sequential Extraction in the Characterisation and Management of Wastes from Steel Processing: A Prospective Review. Int. J. Environ. Res. Public Health 2015, 12, 11724-11755.

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