Adsorptive Stripping Voltammetric Determination Of Cobalt (Ii) On The Carbon Paste Electrode
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE(2011)
Abstract
Traces of cobalt (II) can be determined by adsorptive stripping voltammetry using Nitroso-S as complex forming reagent. First in acetate buffer pH 5.0, cobalt (II)-Nitroso-S complex was adsorbed on the carbon paste electrode with an accumulation potential of +0.1 V. Following this, adsorbed complex was detected by cathodic differential pulse voltammetric scan from +0.1 to -0.6 V. The effective parameters in sensor response were examined. The detection limit of Co(II) was 1.8 mu g l(-1) and relative standard deviations for 10 and 100 mu g l(-1) of Co(II) were 0.8 and 1.2%, respectively. The calibration curve was linear for 3.3-187.1 mu g l(-1) Co(II). This technique does not use mercury and therefore, has a positive environmental benefit. The method, which is reasonably sensitive and selective, has been successfully applied to the determination of trace amount of Co(II) in water samples.
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Key words
Carbon paste electrode, cobalt(II), adsorptive stripping voltammetry, nitroso-S
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