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The effects of As(III) and Sb(III) over a concentration range of 0 to 1000mgdm −3 on the electrowinning of nickel from sulphate solutions have been studied. The cathodic current efficiency decreases whilst the energy consumption increases in the presence of arsenic as well as antimony. Both arsenic and antimony depolarise the cathode when added to the nickel sulphate solution resulting in...