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Promise Sethembiso Ngema and  Freeman Ntuli and  Mohamed Belaid,  The removal of Ni, Cu and Fe from a Mixed Metal System using Sodium Hypophosphite as a Reducing Agent.   journal   = {International Journal of Chemical, Molecular, Nuclear, Materials and Metallurgical Engineering}, [online]. World Academy of Science, Engineering and Technology. August 2012, vol. 68(8). 858 - 861[viewed 22 July 2018]. Available from: http://waset.org/publications/5356.