Schiff bazı temelli yeni geliştirilmiş Cu2+-seçici elektrot kullanılarak çevresel örneklerdeki Cu2+ iyonlarının potansiyometrik tayini

Bu çalışmada, yeni sentezlenen bir schiff bazı kompleksi kullanılarak katyonik türler için iyon seçici elektrotların hazırlanabilmesi durumu araştırılmıştır. Schiff bazı kompleksi, polivinilklorür, o-nitrofenil oktileter ve potasyumtetrakis paraklorotetrafenilborat maddeleri ile farklı kompozisyonlarda PVC-membran karışımları hazırlanmıştır. Hazırlanan membran karışımları, katı-kontak elektrotlara kaplanmıştır ve iyon seçici elektrotlar oluşturulmuştur. Yapılan potansiyometrik ölçümler, hazırlanan elektrotların Cu2+ iyonlarına karşı seçici davranış sergilediğini göstermiştir. Elektrotun en uygun membran bileşiminin ise %3.9 iyonofor, %32.0 PVC, %64.0 o-nitrofenil oktileter (plastikleştirici) ve %0.1 potasyumtetrakis paraklorotetrafenilborat olduğu belirlenmiştir. Hazırlanan Cu2+-seçici elektrotun, çeşitli katyonik türlerin yanında Cu2+ iyonları için 1.0×10-5-1.0×10-1 M derişim aralığında her on katlık konsantrasyon değişiminde 29.8±0.7 mV eğimle doğrusal cevap sergiledi ve doğrusallık katsayısının ise 0.9966 (R2=0.9966) olduğu belirlenmiştir. Elektrotun 5 sn. içerisinde denge potansiyeline ulaştığı ve 4.1×10-6 M tayin limitine sahip olduğu gözlenmiştir. Geliştirilen elektrotun pH=3.0-8.0 arasında deney çözeltilerinin pH değişiminden etkilenmeden potansiyometrik davranış sergilediği test edilmiştir. İlaveten, 12 haftalık kullanım ömrü olan potansiyometrik Cu2+-seçici elektrot, Cu2+ iyonlarının EDTA ile potansiyometrik titrasyonunda ve çeşme suyu, nehir suyu ve baraj suyu gibi farklı matriks ortamlarına sahip su numunelerinde bulunan Cu2+ iyonlarının potansiyometrik tayininde başarılı bir şekilde kullanılmıştır.

Anahtar Kelimeler:

Schiff bazı, Cu2+-seçici elektrot, Potansiyometrik Cu2+ tayini, Su analizleri

Potentiometric determination of Cu2+ ions in environmental samples using a newly developed Cu2+-selective electrode based on schiff base

In this study, we investigated the possibility of preparing ion-selective electrodes for cationic species by using a newly synthesized Schiff base. PVC-membrane compositions in different ratios were prepared by using schiff base complex, polyvinylchloride, o-nitrophenyl octylether and potassiumtetrakis parachlorotetraphenylborate. The prepared membrane compositions were coated on the surfaces of solid state contact electrodes and ion selective electrodes were fabricated. Potentiometric measurements showed that; prepared electrodes exhibited selective behavior towards Cu2+ ions. The most suitable membrane composition of electrode was determined as 3.9% ionophore, 32.0% polyvinylchloride, 64.0% o-nitrophenyl octylether (plasticizer) and 0.1% potassiumtetrakis parachlorotetraphenylborate. The prepared Cu2+-selective electrode showed potentiometric working range to Cu2+ between the concentration of 1.0×10-5 and 1.0×10-1 M with a slope of 29.8±0.7 mV per decade (R2= 0.9966) in the presence of the common cationic species. It was observed that the electrode reached the equilibrium potential within 5 seconds and had a limit of 4.1×10-6 M. It was tested that the developed electrode exhibited potentiometric behavior at pH = 3.0-8.0 without being affected by the pH change of the test solutions. In addition, the potentiometric Cu2+-selective electrode had 12-week lifetime. The electrode was successfully used in the potentiometric titration of Cu2+ ions with EDTA and the potentiometric determination Cu2+ ions in water samples with different matrix structures such as tap water, river water and dam water.

Keywords:

Schiff base, Cu2+-selective electrode, Potentiometric Cu2+ determination, Water analyzes,

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