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Polymeric membrane and coated graphite samarium(III)-selective electrodes based on isopropyl 2-[(isopropoxycarbothioyl)disulfanyl]ethanethioate |
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| Authors: | Mojtaba Shamsipur Morteza Hosseini Mohammad Mehdi Eskandari Mir Fazlollah Mousavi |
| Institution: | a Department of Chemistry, Razi University, Kermanshah, Iran b Department of Chemistry, Tarbiat Modarres University, Tehran, Iran c Department of Chemistry, Shiraz University, Shiraz, Iran d Department of Chemistry, Tehran University, Tehran, Iran |
| Abstract: | New polymeric membrane (PME) and coated graphite (CGE) samarium(III)-selective electrodes were prepared based on isopropyl 2-(isopropoxycarbothioyl) disulfanyl]ethanethioate as a suitable neutral ionophore. The electrodes exhibit Nernstian slopes for Sm3+ ions over wide concentration ranges (1.0×10−5 to 1.0×10−1 M for PME and 1.0×10−6 to 1.0×10−1 M for CGE). The PME and CGE have limits of detection of 3.1×10−6 and 5.0×10−7 M, respectively, and response times of about 20 s. The potentiometric responses are independent of the pH of the test solution in the pH range 4.0-7.0. The proposed electrodes revealed good selectivities over a wide variety of other cations including alkali, alkaline earth, transition and heavy metal ions. The electrodes were successfully applied to the recovery of Sm3+ ion from tap water samples and also, as an indicator electrode, in potentiometric titration of samarium(III) ions. |
| Keywords: | Polymeric membrane electrode Coated graphite electrode Samarium 0 5-Donating ionophore Potentiometry |
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