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Analytical and Bioanalytical Electrochemistry، جلد ۱۴، شماره ۲، صفحات ۱۷۹-۱۹۰
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عنوان انگلیسی All-Solid-State CNT Composite Calcium(II)-Selective Potentiometric Sensor Based on 4,7-Diaza-2,3,8,9-Dibenzo-15-Crown-5 Ionophore
چکیده انگلیسی مقاله A composite of multi-walled Carbon nanotube (MWCN) and polyvinyl chloride (PVC) along with a synthesized neutral carrier 4,7-diaza-2,3,8,9-dibenzo-15-crown-5 (I) has been tried for its selective binding behavior for Ca(II) ions. Compound (I) works as an ionophore, exhibiting high selectivity for calcium ions, when taken with poly(vinyl chloride), sodium tetraphenylborate (NaTPB), MWCNT and  tris(2-ethylhexyl) phosphate (TEP) in the ratio 10:100:3:3:50 (w/w). This composition was used to fabricate a solid contact calcium(II)- selective potentiometric sensor. The developed all solid-state sensor worked well in the concentration range of 1.6×10-7-1.0×10-1 M, with a near Nernstian slope of 28.8+1.0 mV/decade of activity. The response time of this sensor was approximately 10 s. It exhibited a detection limit of 9.1×10-8 M. It worked satisfactorily in the pH range 3.5-7.0. The lifetime of the developed sensor was observed as six weeks and it exhibited good selectivity towards calcium ions over other cations.  It was successfully used as an indicator electrode in the potentiometric titration of Ca(II) with EDTA. It produced comparable results for the determination of the activity of calcium ions in real samples.
کلیدواژه‌های انگلیسی مقاله Ca2+-selective electrodes,Ion-selective electrodes,Potentiometric sensor,Crown ether,Multi-walled carbon nanotubes
نویسندگان مقاله Pankaj Kumar |
Department of Applied Sciences and Humanities, School of Engineering, University of Petroleum and Energy Studies, Bidholi, Dehradun, Uttarakhand, India 248007, India

نشانی اینترنتی https://www.abechem.com/article_249817_ed3a1c9b9997427c81a878b9f4ac45b8.pdf
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