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Study of Cr(VI) in Ashes from Fluidised Bed Combustion of Leather Waste: Applicability of different Speciation Methods

Leather waste originated from shoe industry is considered potential hazardous waste as a consequence of the chrome tanned leather process. On the other hand, the leather waste has an inherent value as fuel that makes feasible its use as a very interesting potential source of energy; nevertheless ash residues are produced during the combustion process. This waste disposed in landfills can cause leachate problems. For that reason, determination of hexavalent chromium is considered as an essential input parameter for the safe disposal of these residues. However the current methods provide ambiguity in the results. The objective of this work was to evaluate two different speciation methods: Method SLC 22 (IUC 18) called Method I, used for leather technicians and Method II, developed by the Analytical Chemistry Laboratory of CIEMAT, to analyse the Cr(VI) content in ashes from fluidised bed combustion of leather waste. Both methods provide appropriate results for these kinds of samples when a non-reducing environment is present.