Use of 5,10,15,20-tetrakis(p-chlorophenyl)porphyrin as sensor material: potentiometric determination of aluminium(III) ions

Oguz Özbek1, Ömer Isildak2
1Science and Technology, Application and Research Center, Zonguldak Bülent Ecevit University, Zonguldak, Turkey
2Department of Chemistry, Faculty of Science and Arts, Tokat Gaziosmanpaşa University, Tokat, Turkey

Tóm tắt

In this study, 5,10,15,20-tetrakis(p-chlorophenyl)porphyrin has been synthesized and used as an ionophore for the preparation of a poly(vinyl chloride) (PVC) membrane sensor for aluminium(III) ions. The optimum composition of the best performing membrane contained ionophore, bis(2-ethylhexyl) adipate, PVC and potassium tetrakis(p-chlorophenyl) borate in the ratio of 4.0:63.0:32.0:1.0 (mg). The prepared PVC membrane morphology has been analysed by scanning electron microscopy. The developed aluminium(III)-selective sensor works in a wide linear concentration range of 1.0 × 10–5 to 1.0 × 10–1 mol l–1 and, the detection limit of this sensor is 2.81 × 10−6 mol l–1. The sensor displays near-Nernstian slope of 25.0 ± 2.7 mV per decade for Al3+ ions. The aluminium(III)-selective sensor has a wide working pH range of 5.0–10.0. The sensor shows good reusability, long-term stability and a fast response time of less than 5 s. In addition, the sensor shows good selectivity for Al3+ ions over different cations. This aluminium(III)-selective sensor was successfully used as an indicator electrode in the potentiometric titration of Al3+ ions with EDTA. The developed sensor was successfully applied to the direct determination of Al3+ in different water samples.

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