VOLTAMMETRIC METHOD FOR DETERMINING CONCENTRATION OF COBALT(II) IONS IN ZINC SULFATE SOLUTIONS Russian patent published in 2003 - IPC

FIELD: analytical methods. SUBSTANCE: method can be utilized for automatic or express-analyses of zinc production process solutions as well as waste or return waters from nonferrous metallurgy entertainments. Method is based in voltammetric determination of cobalt of stationary mercury electrode in ammonium chloride medium in presence of dimethylglyoxime and hydroxylamine against involving differential pulse polarography technique. Voltammetric curve is registered within voltage range from -1.05 to - 1.30 v at the potential scanning speed 10 mV/s. Content of Co(II) is found from the height of cathode peak at potential -1.5 +/- 0.1 V (relative to silver chloride electrode). EFFECT: increased selectivity and sensitivity of analysis. 1 tbl, 18 dwg