二阶导数催化极谱法选择性测定锌电解液中痕量钴.doc

文档介绍：二阶导数催化极谱法选择性测定锌电解液中痕量钴
朱红求;杜娟;李勇刚 ;张泰铭;程菲
【期刊名称】《中南大学学报（英文版） 》 【年（卷）,期】2019（026）001
【摘要】 We report herein a highly selective method for directly determining the trace Co2+in highly concentrated zinc electrolyte. This novel method is based on a second derivative wave of catalytic adsorptive polarography generated by complexing Co2+ with dimethylglyoxime and nitrite onto a dropping mercury electrode. By employing a medium with NH3-NH4Cl buffer, DMG and NaNO2 during determining the trace Co2+, any interferences of highly concentrated Zn2+and other coexisting metal ions in the electrolyte are completely eliminated due to the selective masking effect of EDTA. When the
concentration of Co2+ is within x Id — - x 70mol/L range, it
shows a good linear relationship with the current peak. Detection limit
is x 10 - 11 mol/L, and RSD for<ix2s7cCessive assay