Abstract
Two new Ag(I) chemically modified carbon paste electrodes were prepared with comparative potentiometric study of 1,3,6,10,13-pentaaza-2,14-(2,6-pyridyl)-cyclotetradecane-4,12-dione (PPCT) and 1,3,6,9,11,12-pentaaza-2,13-(2,6-pyridyle)-bicycle[2,2,9]pentadecane-4,11-dione (PPBP) as ionophore. These sensors have been modified with sol–gel–Au nanoparticles to obtain a wide concentration range for potentiometric determination of Ag(I) in aqueous solutions. The sensors exhibit significantly enhanced selectivity toward Ag(I) ions over a wide concentration range of 4.0 × 10−9–2.2 × 10−2 and 2.2 × 10−7–2.0 × 10−2 mol L−1 with a lower detection limit of 2.5 × 10−9 and 2.0 × 10−7 mol L−1 for PPCT and PPBP modified electrodes respectively. The electrodes are highly selective to Ag(I) ions over a large number of mono, bi, and tri-valent cations. These electrodes were successfully used as indicator electrode for potentiometric determination of silver in sulphadiazine (burning cream) and radiological film.
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Mashhadizadeh, M.H., Ramezani, S., Shockravi, A. et al. Comparative study of carbon paste electrodes modified by new pentaaza macrocyclic ligands and gold nanoparticles embedded in three-dimensional sol–gel network for determination of trace amounts of Ag(I). J Incl Phenom Macrocycl Chem 76, 283–291 (2013). https://doi.org/10.1007/s10847-012-0197-6
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DOI: https://doi.org/10.1007/s10847-012-0197-6