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UPSI Digital Repository (UDRep)
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| Abstract : Universiti Pendidikan Sultan Idris |
| This study describes the construction and characterisation of zinc aluminium layered double hydroxides-4(2,4-dichlorophenoxy)butyrate (Zn/Al-DPBA) nanocomposite membrane electrode for determination of salicylate. The best performance of the membrane electrode was shown by having compositions Zn/Al-DPBA : PVC : 2-NPOE : NaTPB at 7 : 33 : 60 : 3 The sensitivity, selectivity, response time, working range and detection limit of the membrane sensor depends on the ionophore and the pH value of the solution. The best Nernstian slope for the membrane sensor is 58.8 ± 1.0 mV per decade in the concentration range of 1.0 x 10-5 to 1.0 x 10-1 M with a detection limit of 3.9 x 10-6 M. The potentiometric response is independent of the pH of the solution in the pH range 4.0 to 12.0 at temperature 25.0 ± 1.0 ºC. The proposed sensor was easy to develop, low cost, fast response time (11-35 seconds) and shows a good stability for at least 4 months without significant change in its performance characteristics. The selectivity coefficients were determined by the mixed solution method with fixed interference. Good selectivity towards salicylate ion in the presence of other ions was obtained. |
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