Surface Changes at Platinized Platinum Based Hydrogen Gas Electrodes Following Use in Highly Saline Aqueous Solutions |
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| Authors: | M F Camões B Anes C S Oliveira M E Melo Jorge |
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| Institution: | 1. Centro de Ciências Moleculares e Materiais, Faculdade de Ciências da Universidade de Lisboa, Lisboa, Portugal;2. Instituto Português da Qualidade Caparica, Portugal;3. Centro de Química e Bioquímica, Departamento de Química e Bioquímica, Faculdade de Ciências da Universidade de Lisboa, Lisboa Portugal |
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| Abstract: | Platinized platinum based hydrogen gas electrodes, Pt(Pt)|H2(g)|H+(aq), and silver‐silver chloride electrodes, Ag|AgCl|Cl? (aq), make up the Harned cell, without transfer, working in the potentiometric mode at Cl? concentrations and ionic strengths, I, below 0.1 mol kg?1, for assigning primary pH values to reference pH buffer solutions. This work reports on experiments performed at higher I and Cl? solutions up to 0.7 mol kg?1, aiming at addressing seawater conditions with results of equally high quality. In the course of measurements, the occasional occurrence of highly unstable potentials denoted electrode malfunction; Pt metal surfaces observed by SEM/EDS and XRD exhibit strong Ag and Cl peaks corresponding to the presence of AgCl crystals deposited at both surfaces. |
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| Keywords: | Platinum based electrodes Silver chloride crystals Seawater Silver‐silver chloride electrodes |
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