Camsı Karbon Elektrot ve Nafyon-Grafenle Modifiye Edilmiş Camsı Karbon Elektrot ÜzerindeEthalfluralinin Voltametrik Tayini

Bu çalışmada, dinitroanilin grubu bir herbisit olan ethalfluralinin(ETF), camsı karbon elektrot(CKE) venafyon-grafenle modifiye edilmiş camsı karbon elektrot(N-GR/CKE) üzerindeki elektrokimyasal davranışıdönüşümlü voltametri (DV) yöntemiyle araştırıldı. ETF'nin voltametrik tayini diferansiyel puls voltametrisi(DPV)yöntemiyle incelendi. ETF'nin DPV yöntemiyle pH 7 fosfat tamponunda 0 ile -1.5 V arasında CKE ile yapılanpotansiyel taramasında -0.942V(1.pik akımı),-0.768V (2.pik akımı ); N-GR/CKE ile yapılan potansiyel taramasındaise -0.674 V(1.pik akımı ), -0.563 V (2.pik akımı) görüldü. ETF'nin CKE ve N-GR/CKE üzerindeki optimum deneyşartları belirlendikten sonra, kalibrasyon doğrusu, çalışma aralığı, tayin edilebilme sınırı, gözlenebilme sınırı, gün içive günler arası tekrar edilebilirlikleri belirlendi. Bunun yanında N-GR/CKE üzerinde ETF’ye etki eden bazıkatyonların ($Cu^{2+}$, $Ni^{2+}$, $Co^{2+}$, $Ca^{2+}$, $Pb^{2+}$) girişim etkisi incelenmiştir. Elde edilen sonuçlar ETF'nin CKE ve N GR/CKE üzerinde gerçek numunelerde (toprak, su) uygulanabileceğini göstermektedir.

Voltammetric Determination of Ethalfularin on Glassy Carbon Electrode and Nafion-Graphene Modified Glassy Carbon Electrode

In this study, the electrochemical behavior of ethalfluraline (ETF), a dinitroaniline group herbicide, onglassy carbon electrode(CKE) and nafion-graphene modified glassy carbon electrode(N-GR /CKE) was investigatedby cyclic voltammetry(CV). Voltammetric determination of ETF was examined by differential pulsevoltammetry(DPV). Two peaks observed at -0.942V(1st peak current) and -0.768V(2nd peak current) during thepotential scan of EFT by DPV method in pH 7 phosphate buffer solution between 0 and -1.5V on CKE and at -0.674V(1st peak current) and -0.563 V(2nd peak current) during the potential scan on N-GR/CKE. After determining theoptimum experimental conditions of ETF on CKE and N-GR /CKE, calibration line, working range, limit ofdetection(LOD), limit of quantification(LOQ), intra-day and inter-day repeatability were determined. In addition, the interference effect of some cations($Cu^{2+}$, $Ni^{2+}$, $Co^{2+}$, $Ca^{2+}$, $Pb^{2+}$) on N-GR/CKE was also investigated.The results show that EFT can be determined in real samples(water and soil) using CKE and N-GR/CKE.

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