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2. Metal prices in $/troy Oz correspond to commodity prices.http://www.metalprices.com/dailyexchangedata/Index(accessed February 5, 2015) .
3. For specific limits on metal residues, see:http://www.ema.europa.eu/docs/en_GB/document_library/Scientific_guideline/2009/09/WC500003586.pdf(accessed February 5, 2015) .
4. British Geological Survey: Risk List 2011.http://www.bgs.ac.uk/downloads/start.cfm?id=2063(accessed February 5, 2015) .
5. Recent advances in homogeneous nickel catalysis