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Sensors for Corrosion Detection: Measurement of Copper Ions in 3.5% Sodium Chloride Using Screen-Printed Platinum Electrodes

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6 Author(s)
Cranny, A. ; Sch. of Electron. & Comput. Sci., Univ. of Southampton, Southampton, UK ; Harris, N.R. ; Mengyan Nie ; Wharton, J.A.
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Planar screen-printed platinum electrodes developed for use in corrosion monitoring have been evaluated using cyclic differential pulse voltammetry and shown to detect cupric ions (Cu2+) over a range up to 100 mM in a background of 3.5% by weight sodium chloride solution. The reduction of Cu2+ to metallic copper is shown to proceed as two successive single-electron transfer reactions involving an intermediate chemical step where the cuprous ion (Cu+) is complexed by chloride to form the dichlorocuprous anion CuCl2-. By comparison, the complexation step during the oxidation of copper to Cu2+ can involve a number of different chlorocopper(I) complexes of the general form [CuCl(n+1)]n- depending on the chloride concentration, which can make detection via a stripping reaction difficult.

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Sensors Journal, IEEE  (Volume:12 ,  Issue: 6 )