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

Yıl 2018, Cilt: 24 Sayı: 7, 1325 - 1331, 28.12.2018

Faruk Kardaş , Cihan Topçu

Öz

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

Öz

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.

Anahtar Kelimeler

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

Kaynakça

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