Potentiometric determination of some surfactants using ion selective electrodes in different water samples / Ragheb Mohamed Ragheb Kandeel ; Supervised Maher M.I. Eldessouky , Tamer Awad Elsayed Ali

Thesis (M.Sc.) - Cairo University - Faculty of Science - Department of Analytical Chemistry

A new DMTB ion-selective screen-printed and carbon paste sensors based on Ý-cyclodextrine has been developed. The electrodes displayed a linear potential response over the wide concentration range from 3.2{u00D7}10⁻⁷ to 1.0{u00D7}10⁻², 1.4{u00D7}10⁻⁷ to 1.0{u00D7}10⁻² , 2.1{u00D7}10⁻⁷ to 1.0{u00D7}10⁻² and 1.0{u00D7}10⁻⁷ to 1.0{u00D7}10⁻² mol L-1 with a detection limit of 3.2{u00D7}10⁻⁷, 1.4{u00D7}10⁻⁷, 2.1{u00D7} 10⁻⁷ and 1.0{u00D7}10⁻⁷ mol L-1 for modified carbon paste (MCPEs; electrodes I and II) and screen-printed sensors (MSPEs; electrodes III and IV), respectively. The slopes of the calibration graphs are 55.18 ± 2.23 and 57.01± 1.38 mV decade-1 for MCPEs with dibutylphthalate (DBP) (sensor I) and o-nitrophenyloctylether (o-NPOE) (sensor II) as plasticizers, respectively. Also, the MSPEs show good potentiometric slopes of 56.77 ± 0.20 and 57.74 ± 0.97 mV decade-1 with DBP (sensor III) and o-NPOE (sensor IV), respectively. The electrodes show stable and reproducible potential over a period of 55, 58, 137 and 166 days for sensors (I), (II), (III) and (IV), respectively. The sensors possessed some advantages such as short conditioning time, very fast response time (<14, 12, 9 and 6 s for sensors (I), (II), (III) and (IV), respectively) and specially good discriminating ability towards DMTB ions over a wide variety of alkali, alkaline earth, transition, and heavy metal ions

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