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RISS 인기검색어
- 검색키워드
- 저자 : Isildak, (검색결과 2 건)
- 무료
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- 유료
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A New Fe (III)-Selective Membrane Electrode Based on Fe (II) Phthalocyanine
Ozer, Tugba,Isildak, Ibrahim The Korean Electrochemical Society 2019 Journal of electrochemical science and technology Vol.10 No.3
A new miniaturized all solid-state contact Fe (III)-selective PVC membrane electrode based on Fe (II) phthalocyanine as a neutral carrier was described. The effects of the membrane composition and foreign ions on the electrode performance was investigated. The best performance was obtained with a membrane containing 32% poly (vinyl chloride), 64% dioctylsebacate, 3% Fe (II) phthalocyanine, and 1% potassium tetrakis (p-chlorophenyl) borate. The electrode showed near Nernstian response of $26.04{\pm}0.95mV/decade$ over the wide linear concentration range $1.0{\times}10^{-6}$ to $1.0{\times}10^{-1}M$, and a very low limit of detection $1.8{\pm}0.5{\times}10^{-7}M$. The potentiometric response of the developed electrode was independent at pH 3.5-5.7. The lifetime of the electrode was approximately 3 months and the response time was very short (< 7 s). It exhibited excellent selectivity towards Fe (III) over various cations. The miniaturized all solid-state contact Fe (III)-selective membrane electrode was successfully applied as an indicator electrode for the potentiometric titration of $1.0{\times}10^{-3}M$ Fe (III) ions with a $1.0{\times}10^{-2}M$ EDTA and the direct determination of Fe (III) ions in real water samples.
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Electroanalytical Determination of Copper(II) Ions Using a Polymer Membrane Sensor
Oguz Ozbek,Meliha Burcu Gurdere,Caglar Berkel,Omer Isildak The Korean Electrochemical Society 2023 Journal of electrochemical science and technology Vol.14 No.1
In this study, a new potentiometric sensor selective to copper(II) ions was developed and characterized. The developed sensor has a polymeric membrane and contains 4.0% electroactive material (ionophore), 33.0% poly(vinyl chloride) (PVC), 63.0% bis(2-ethylhexyl)sebacate (BEHS) and 1.0% potassium tetrakis(p-chlorophenyl)borate (KTpClPB). This novel copper(II)-selective sensor exhibits a Nernstian response over a wide concentration range from 1.0×10<sup>-6</sup> to 1.0×10<sup>-1</sup> mol L<sup>-1</sup> with a slope of 29.6 (±1.2) mV decade<sup>-1</sup>, and a lower detection limit of 8.75×10-7 mol L<sup>-1</sup>. The sensor, which was produced economically by synthesizing the ionophore in the laboratory, has a good selectivity and repeatability, fast response time and stable potentiometric behaviour. The potential response of the sensor remains unaffected of pH in the range of 5.0-10.0. Based on the analytical applications of the sensor, we showed that it can be used as an indicator electrode in the quantification of Cu<sup>2+</sup> ions by potentiometric titration against EDTA, and can also be successfully utilized for the determination of copper(II) ions in different real samples.
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