Journal
ELECTROANALYSIS
Volume 23, Issue 7, Pages 1663-1670Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.201100003
Keywords
Bromate; Electrocatalysis; Cobalt; Seawater; Stripping voltammetry
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [SPP 1158, CR145/10-1, 10-2]
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The analysis of Cobalt (Co) at low pM concentrations in seawater with Adsorptive Cathodic Stripping Voltammetry involves high concentrations of sodium nitrite (NaNO2) to enhance the signal in an electrocatalytic reaction. In this study we found three substitutes for NaNO2 that critically affected the sensitivity. Optimisation of a method with potassium bromate (KBrO3) resulted in an excellent detection limit (0.9 pM) after a 90 s adsorption period. Reactant concentration and consumption were 10x reduced compared to protocols with NaNO2 and reagent blanks were lower. Accuracy and precision were verified with SAFe intercalibration standards and the method was applied using open ocean seawater samples. The reaction mechanism is discussed and differences to NaNO2 are shown.
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