Octaethylporphyrin as an ionophore for aluminum potentiometric sensor based on carbon paste electrode |
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Authors: | Majid Soleimani Majid Ghahraman Afshar |
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Affiliation: | 1. Department of Chemistry, Imam Khomeini International University (IKIU), P.O. Box: 288, Qazvin, Iran
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Abstract: | A new sensor to quantitatively sense aluminum in real sample conditions is presented that uses the potentiometric ion selective electrodes. Aluminum is a cation that plays an important role in the environmental process. This approach is proposed to determine aluminum levels in real samples in the required range (10?6–10?2 M). Carbon paste electrode (CPE) is introduced here as a potentiometric sensor to measure free concentration of aluminum ion. Octaethylporphyrin (OEP) acts as a selective aluminum recognition agent in the CPE. The suitable selectivity coefficient is obtained for the CPEs compare to interfering cation. The Nernstian slope and detection limit are achieved 18.4 mV/decade and 2.5 × 10?6 M Al3+, respectively. Finally, the proposed method is applied to determine aluminum concentration in real water samples and the result of this method is in agreement with the result of atomic absorption spectroscopy (AAS). |
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