A new PVC membrane electrode for determination of thallium (I) ion based on dibenzopyridino-18-crown-6 as membrane carrier was designed. The electrode exhibits a near Nerstian response (54.4 ± 0.2 mV! decade) for T1+ over a wide concentration range (2.70 x 10-2 to 8.9 x 10-'M). It has very short response time and can be used for three months without observing any divergence. The proposed electrode revealed good selectivity for Tr over a wide variety of other metal ions except for Ag+ and could be used in a pH range of 2.5 - 10. This electrode has been used as an indicator electrode in potentiometric titration of thallium (I) ion and in direct determination of it in spiked water samples.
JAVED ZOLGHARNEIN ,MORTEZA HABIBI ,GHULAM AZIMI ,
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