NiO Modifiye Karbon Pasta Sensör Yüzeyinde Bakır ve Kadmiyum’un Anodik Sıyırma Voltametrisi ile Tayini

Year 2019, , 1403 - 1416, 31.07.2019

Ceren Yıldız , Dilek Eskiköy Bayraktepe , Zehra Yazan

https://doi.org/10.29130/dubited.527608

Cited By: 1

Abstract

Bu çalışmada NiO nanopartiküllerine
dayanan, hızlı, duyarlı, düşük maliyetli yeni bir karbon pasta elektrot
geliştirilmesi ve bu elektrodun differansiyel puls anodik sıyırma voltametrisi
(DPASV) yöntemiyle musluk suyunda bulunan Cu²⁺ ve Cd²⁺’un
analizinde kullanılması amaçlanmıştır. Bu amaç doğrultusunda, çıplak karbon
pasta elektrot (KPE) ve NiO nanopartikülleriyle modifiye edilmiş olan karbon
pasta elektrot (NiO/KPE) yüzeyleri EIS ve CV yöntemiyle yapılan karakterizasyon
yöntemleri ile karşılaştırılmıştır. Elde edilen sonuçlar, NiO/KPE’un
elektroaktif türlere karşı elektrokatalitik etkisinin olduğunu göstermiş ve
NiO/KPE, Cu²⁺ ve Cd²⁺’un voltametrik analizinde çalışma
elektrodu olarak kullanılmıştır. Çalışma elektrodunun belirlenmesinin ardından,
bazı analitik ve yöntem parametrelerinin optimizasyonu yapılmış olup, her iki
katyon için; optimum NiO bileşimi 3,0 mg NiO/30 mg pasta, optimum pH BR tampon
ortamında 3,0, optimum biriktirme potansiyeli -1,5 V ve optimum biriktirme
süresi ise 180,0 s olarak belirlenmiştir. Belirlenmiş olan optimum koşullarda,
bir katyonun derişimi sabit tutulup, diğerinin derişimi arttırılarak ve her iki
katyonun da derişimi arttırılarak kalibrasyon eğrileri oluşturulmuştur.
Kalibrasyon eğrilerinden elde edilen veriler yardımıyla bulunan alt tayin
sınırı ve doğrusal çalışma aralıkları her bir katyon için hesaplanmıştır.
Yöntemin uygulanabilirliğinin test edilmesi amacıyla, musluk suyu içeren
ortamda da Cu²⁺ ve Cd²⁺’un analizi yeni geliştirilmiş
olan DPASV yöntemiyle yapılmış ve geri kazanı değerleri %100 civarında
bulunmuştur.

Keywords

Cu2+, Cd2+, Voltametri, Karbon pasta elektrot

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