Determination of Cobalt by Adsorptive Stripping Voltammetry Using Cobalt(II)-nioxime-nitrite Catalytic System
- 1 August 1990
- journal article
- research article
- Published by Taylor & Francis in Analytical Letters
- Vol. 23 (8) , 1487-1503
- https://doi.org/10.1080/00032719008052503
Abstract
A differential pulse adsorptive voltammetric method for the cobalt determination with detection limit of 1.2x10−10 M (100 sec preconcentration) is proposed. The preconcentration of Co(II)-nioxime complex during the adsorption step and utilization of catalytic effect during the reduction of Co(II)-nioxime complex provides a great enhancement of cobalt voltammetric response. The ammonia buffer solution containing nioxime and nitrite is suitable for the adsorptive voltammetric determination of nanomolar cobalt concentrations in the presence of 1000-fold excess of nickel and 10 000-fold excess of zinc.Keywords
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