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Simultaneous absorptiometric determination of copper, nickel, iron and cobalt in refinery process streams : potential on-line application. (Stellenbosch : University of Stellenbosch, 2005-12)A method for the simultaneous spectrophotometric determination Cu(aq)2+, Ni(aq)2+, Co(aq)2+, and Fe(aq)2+, 3+ in refinery process streams based on multiwavelength analysis is proposed. The individual concentrations of ...