Construction of S?-Selective Electrode and Thermodynamic Study of the Ternary Aqueous Mixed Electrolyte System (SrCl2, KG, H20) Using Potentiometric Method

Subject Areas : Journal of Physical & Theoretical Chemistry

M. Kia ¹ , A. Islamnezhad ² , Sh. Shariati ³

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Received: 2015-05-31 Accepted : 2015-05-31 Published : 2011-08-01

Keywords: Ion selective electrode, Thermodynamic investigation, Ternary electrolyte system, Potentiometric method,

Abstract :

In order to preparing strontium ion selective electrode 6-(4- nitropheny1)-2-pheny14, 4- dipropy1-3, 5-diaza-bicyclo [3, 1, 0] hex-2-ene (NPDBH) was used as an ionophore. This electrode responds to Sr (II)ion with a sensitivity of 28.2 ± 0.5 mV/decade over the range 1.0 x 10-6 to 1.0 Mat pH 3.0-10.0. Thelimit of detection was 2.4 x 10-7 M. The influences of membrane composition, the pH of the testsolution, the temperature effect and the interfering ions on the electrode performance for the proposedelectrode were investigated. In the next step, electrolyte solution system SrCl2, KC1, H20 in the highconcentration range were thermodynamically investigated. The thermodynamic investigations wereperformed by evaluation of potentiometric experimental data, successfiffly.