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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 1    January 2019

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Selective determination of trace cobalt in zinc electrolytes by second-derivative catalytic polarography
ZHU Hong-qiu(朱红求)1, DU Juan(杜娟)2, LI Yong-gang(李勇刚)1, ZHANG Tai-ming(张泰铭)2, CHENG Fei(程菲)1

1. School of Information Science and Engineering, Central South University, Changsha 410083, China;
2. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China

Abstract:We report herein a highly selective method for directly determining thetraceCo2+ in highly concentrated zinc electrolyte.Thisnovel methodis based on a second derivative wave of catalytic adsorptive polarography generatedby complexing Co2+ with dimethylglyoxime and nitrite onto a dropping mercury electrode. By employinga medium with NH3-NH4Cl buffer, DMG andNaNO2 during determining the trace Co2+,any interferences of highly concentrated Zn2+ and other coexisting metal ionsin the electrolyte are completely eliminated due to the selective masking effect of EDTA. When the concentration of Co2+ is within 1.0×10–10 –3.2×10–7 mol/L range, it showsa good linear relationship with the current peak. Detection limit is 1.0×10–11 mol/L, and RSD ≤2.7% for six successive assays. We have compared the efficiency of the current method to that obtained by cobalt nitroso-R-salt spectrophotometry, and the absolute values of relative deviations are ≤4.2%. The method developed and described herein has been successfully employed in determining the trace Co2+ in actual zinc electrolyte.

 

Key words: catalytic adsorptivevoltammetry; highly selective masking; Co2+ determination; zinc electrolyte

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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