Abstract
A new solvent polymeric membrane (PME) and coated graphite (CGE) electrodes based on 3-amino-2-mercapto-3H-quinazolin-4-one as a suitable carrier for La(III) ion are described. The sensors exhibited a Nernstian response for La(III) ion over a wide concentration range (3.0 × 10−7 to 1.0 × 10−1 M for PME and 1.0 × 10−7 to 1.0 × 10−1 M for CGE) with a slope of 20.1 ± 0.3 (PME) and 23.4 ± 0.4 (CGE) mV decade−1. The lower detection limits by PME and CGE were 2.0 × 10−7 and 7.1 × 10−8 M, respectively. The potentiometric response of the proposed electrodes was independent of the pH of the test solution in the pH range 3.0–9.0 with a fast response time (<10 s). The applications of prepared sensors were demonstrated in the determination of lanthanum ions in spiked water sample and also utilized for indirect determination of fluoride content of two mouth wash preparation samples.
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Taher, M.A., Fayazi, M., Pooramiri, B. et al. Lanthanum-selective sensors based on 3-amino-2-mercapto-3H-quinazolin-4-one in PVC matrix. J IRAN CHEM SOC 10, 151–159 (2013). https://doi.org/10.1007/s13738-012-0136-x
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DOI: https://doi.org/10.1007/s13738-012-0136-x