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New cesium ion-selective PVC membrane electrode based on a novel calix[6]arene derivative
(BULGARIAN ACAD SCIENCE, 2011) Aslan, N.; Canel, E.; Yilmaz, M.; Kilic, E.
Cesium-selective polymeric membrane electrode, based on a recently synthesized calix[6]arene compound of 5,11,17,23,29,35-tert-butyl-37,39,41-trimethoxy-38,40,42-tricyanomethoxy-calix[6]arene, is described. The electrode exhibits a near Nernstian response for Cs (I) ions over a wide concentration range of 1.0x10(-1) to 1.0x10(-5) M with a slope of 55.3 +/- 1.2 mV/p[Cs]. The developed electrode has a very short response time (4-5 s) and it can be used for at least 30 days without any considerable divergence in potentials. The proposed electrode shows high selectivity towards cesium (I) ions with respect to alkali, alkaline earth, several transition and heavy metal ions. The potentiometric response is independent of pH of the test solution in the pH range of 3.0-10.0. The electrode can be used as an indicator electrode in the potentiometric titrations of cesium (I) ions with sodium tetraphenylborate and for direct determination of cesium in tap water samples.