Membrane Sensors for the Determination of Salicylate in Pharmaceutical Formulations and Potentiometric Titration with Iron (III)

Nashwa M. H. Rizka*, Salem M. Hamzab, and Yasser M. Abdel-Karemb

aEnvironmental Biotechnology Department, Genetic Engineering and Biotechnology

Research Institute (GEBRI), Minufiya University, Sadat City, Egypt.

bChemistry Department, Faculty of Science, Minufiya University, Egypt

٭   Corresponding author; Tel.; +20482601267; Fax; +20482601266

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Summary: Four polymeric membrane sensors have been developed for the analysis of salicylate based on [Ni (bphen)2] (salicylate)2 (sensor 1), [Mn (bphen)2] (salicylate)2 (sensor 2) and [Co (bphen)2] (salicylate)2 (sensor 3) as a new ion pairs. Sensor 4 was prepared by using [Ni (bphen)2] (salicylate)2 ion-pair immobilized on graphite rode. The results of this study show that the sensors show a Nernstian response for salicylate over a wide concentration range, 1×10-1-1×10-5 M, 1×10-1-3.2×10-5 M,  1×10-1-4.0×10-M, and 1×10-1-4.0×10-5 M for sensor1, sensor 2, sensor 3 and sensor 4, respectively. These electrodes are very easy to prepare and use, and show a Nernstian response. Low detection limit, wide dynamic range, good selectivity, rapid response time and relatively long term stability make these electrodes suitable for measuring the concentration of salicylate in real samples, without the need of preconcentration or pretreatment steps and without any significant interaction from other anionic species present in the samples. The proposed sensors are used for potentiometric titration of iron content of some drugs.

Sabrein Ibrahim,
Oct 12, 2016, 12:48 PM