Abstract
An electrochemical method based on stripping chronopotentiometry (SCP) with a gold film electrode has been developed for determining arsenic in seawater. The detection limits were 0.053 ppb (0.71 nM) and 0.022 ppb (0.29 nM) for total inorganic As (As(T)) and As(III) after deposition times of 60 and 150 s, respectively. Compared to other stripping chronopotentiometric methods that use a gold macroelectrode to perform measurements of arsenic in seawater, the procedure described here exhibits better sensitivity and a fourfold shorter deposition time. Among the SCP methods, our procedure had proven its ability to analyse arsenic(III) in seawater. It therefore allows the concentrations of the various arsenic inorganic species in seawater—i.e. As(T), As(III) and As(V)—to be analysed. The proposed method is reliable, inexpensive and compact. It was successfully applied to the study of arsenic speciation along the salinity gradient of the Penzé estuary (NW France).
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We wish to thank the anonymous referees whose comments helped us to improve the content and readability of our paper. We sincerely thank Jean-Pierre Oldra for pretreating the glassy carbon electrode with great skill.
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Vandenhecke, J., Waeles, M., Riso, R.D. et al. A stripping chronopotentiometric (SCP) method with a gold film electrode for determining inorganic arsenic species in seawater. Anal Bioanal Chem 388, 929–937 (2007). https://doi.org/10.1007/s00216-007-1284-1
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DOI: https://doi.org/10.1007/s00216-007-1284-1