Comparison of Alternate Reactants for pM Level Cobalt Analysis in Seawater by the Use of Catalytic Voltammetry.

Baars, Oliver and Croot, Peter (2011) Comparison of Alternate Reactants for pM Level Cobalt Analysis in Seawater by the Use of Catalytic Voltammetry. Electroanalysis, 23 (7). pp. 1663-1670. DOI 10.1002/elan.201100003.

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Abstract

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 10× 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.

Document Type: Article
Keywords: Marine chemistry; Bromate; Electrocatalysis; Cobalt; Seawater; Stripping voltammetry
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1002/elan.201100003
ISSN: 1040-0397
Date Deposited: 01 Nov 2011 09:41
Last Modified: 25 Jul 2018 09:06
URI: http://oceanrep.geomar.de/id/eprint/12442

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