Abstract

The construction, performance, and applications of mercury(II) ion selective electrode based on calix[2]thieno[2]pyrrole receptor are described. The influences of membrane composition and pH on the potentiometric response of the electrode were investigated. The electrode exhibits Nernstian response (27.8 mV per decade) for Hg²⁺ ion over a wide concentration range (1.0 x 10^-6 to 1 x 10^-2 M). The response time of the electrodes is 20 s for the solution of Hg²⁺ ions in the concentration range of 1 x 10^-6 – 1 x 10^-2 M. The selectivity coefficient values showed better sensitivity and selectivity of this sensor for mercury(II) ions over various mono-, di, and trivalent cations studied. The sensor was also applied as indicator electrode in the potentiometric titrations.

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