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The nickel and zinc complexe~ with Wen shnwrtl M I irreversildr rcdrrcion. Tho plot, of log i/(&c) vas tho pntrritiril w i s riot ti straight liue. A mixximum on tho riickcl wave was ol11.v suppressed in tho pr.ese1ic.r of 0.0080/0 Triton X-100. Thc lidf-J\ :4ve potentinls of i m h cwnplcxcs were sbifted to mort ricyativc vnlues with increasing concentratinn of the It is stablc against reducing agents (ie., ferrous iron, sulfite, ctc.) and the reduction wave is well separated from the wnvcs of nickel, lead and cdmium. BCCRIIR~ of the drawnvut wave, nnd tho lack of a suitable plateau for mcnsuring the difIuuon curieiit, the trien complcx is, however, not euit,nblc for the p a n t itative determiriat~or~ of cobalt in the prcsence of other mctds.The trivalent complex is easily prepared.the neutral products in order to obtain AHr+(ion)(2) E.