John Wiley & Sons, Ltd.

Transformation/Dissolution Characteristics of a Nickel Matte and Nickel Concentrates for Acute and Chronic Hazard Classification

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Courtesy of John Wiley & Sons, Ltd.

For the purposes of aquatic hazard classification under the United Nations Globally Harmonized System of Classification (UN GHS), we have examined the T/D characteristics of a Ni matte and four Ni concentrates at pH 6 using the UN Transformation/Dissolution Protocol (T/DP) for Metals and Sparingly Soluble Metal Compounds. Among the analytes Ni, Co and Cu, Ni was released into the T/D solutions in by far the highest concentrations, and was thus the main driver in establishing the hazard classification. We applied an extrapolation‐scaling approach to obtain concentrations of total dissolved Ni at low loadings of 0.1 and 0.01 mg/L for derivation of chronic classification outcomes in the EU Classification, Labelling and Packaging (CLP) scheme. The T/D data would classify the Ni matte as Acute 2‐Chronic 2 under the GHS scheme, and Chronic 1 under the EU CLP. Three of the four Ni concentrates would classify as GHS Acute 2‐Chronic 2 and EU CLP Chronic 2, while the fourth would classify as GHS Acute 3‐Chronic 3 and EU CLP Chronic 3. In applying the CSA (Critical Surface Area) approach to the Ni concentrates, acute and chronic hazard classification outcomes resulted that were the same as those derived from direct application of the T/D data to the GHS and EU schemes. Such agreement provided confidence that the CSA approach could yield scientifically defensible acute and chronic hazard classification outcomes. Integr Environ Assess Manag © 2014 SETAC

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