Nikel-Sakkarin Temelli PVC-Membran Karbonat CO32- Seçici Elektrot ve Potansiyometrik Uygulamaları

Year 2016, Volume: 6 Issue: 2, 283 - 292, 01.06.2016

Cihan Topcu

Abstract

Bu çalışmada, nikel-sakkarin Ni-sac kompleksinin iyon seçici elektrotların yapısında aktif bileşen olarak kullanılması ile belirli bir iyonik türe karşı seçici polivinilklorür-membran PVC-membran iyon seçici elektrotların hazırlanabilmesi durumu araştırıldı. Nikel-sakkarin kompleksi kullanılarak farklı oranlarda PVC-plastikleştirici-iyonofor membran bileşimleri hazırlandı. Hazırlanan bu membran bileşimleri, katı-kontakt elektrotların yüzeyine kaplanarak iyon seçici elektrotlar oluşturuldu. Yapılan potansiyometrik ölçümler sonucunda Ni-sac kompleksi ile hazırlanan elektrotların karbonat iyonlarına karşı seçici davranış sergilediği ve en iyi membran bileşiminin %30 PVC, %67 plastikleştirici Dibütilftalat ve %3 iyonofor Ni-sac olduğu belirlendi. Hazırlanan PVCmembran karbonat seçici elektrodun yaygın olarak kullanılan anyonik türlerin yanında karbonat iyonlarına karşı 1.0×10-2-1.0×10-6 M arasında her on katlık derişim değişiminde -24±2 mV eğimle doğrusal cevap sergilediği gözlendi. Elektrodun cevap zamanı ortalama olarak 12 saniye ve tayin limiti ise 6.1×10-7 M olarak belirlendi. PVC-membran karbonat seçici elektrodun potansiyometrik cevabının pH=5.0-9.0 arasında çözeltinin pH değişiminden etkilenmediği tespit edildi. Ayrıca 8 hafta kullanım ömrüne sahip PVC-membran karbonat seçici elektrot, ticari olarak satılan farklı maden suyu numunelerindeki karbonat iyonlarının kantitatif tayininde başarıyla kullanıldı

Keywords

Karbonat seçici elektrot, Karbonat tayini, Potansiyometri, PVC-membran sensör

PVC-Membrane Carbonate CO3 2- Selective Electrode based on Nickel-Saccharine and Its Potentiometric Applications

Abstract

In this study, a nickel saccharine Ni-sac complex was used as ionophore and various membrane compositions PVC-plasticizerionophore at different ratios were prepared by using it as ionophore. Various potentiometric electrodes were constructed by coating the prepared membranes on the solid-contact surfaces of the electrodes and their potentiometric behaviors were investigated. The potentiometric measurements performed with the prepared electrodes showed that the Ni-saccharine complex material exhibited sensitive and selective response towards carbonate ions and the optimum membrane composition providing the best potentiometric characteristics was determined as 30% PVC, 67% plasticizer dibutylphthalate , 3% ionophore Ni-sac . It was observed that the developed carbonate selective PVC-membrane electrode exhibited linear response towards carbonate ions in the concentration range of 1.0×10-2-1.0×10-6 M with a slope of -24±2 mV/decade in the presence of the common anionic species. The detection limit and average response time of the electrode were also determined as 6.1×10-7 M and 12 seconds, respectively. The potentiometric response of the carbonate selective PVC-membrane electrode was independent from the pH of the test solution in the pH range of 5.0-9.0. In addition, the electrode had a life-span of 8 weeks. The proposed PVC-membrane carbonate selective electrode was applied successfully for the quantitative carbonate determination in various commercially available mineral water samples.

Keywords

Carbonate selective electrode, Carbonate determination, Potentiometry, PVC-membrane sensor

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