1H-1, 2, 4-triazole-3-thiol modifiye altın elektrot kullanılarak fenolün elektrokimyasal davranışının incelenmesi ve voltametrik tayini

Bu çalışmada, 1H-1,2,4-triazole-3-thiol (T3T) ile altın (Au) elektrot yüzeyi kaplanarak Au/T3T elektrodu hazırlanmıştır. Kaplama işlemi, dönüşümlü voltametri (CV) yöntemi kullanılarak 1×10-3 mol L-1 T3T çözeltisi içerisinde, 0,1 V s-1 tarama hızıyla -0,8 V ile +1,5 V arasında, 30 çevrim sayısı ile gerçekleştirilmiştir. Hazırlanan Au/T3T elektrodu yüzeyinde dönüşümlü voltametri (CV) ve diferansiyel puls voltametrisi (DPV) teknikleri kullanılarak fenolün (Ph) elektrokimyasal davranışı incelenmiş ve DPV tekniği ile voltametrik tayini gerçekleştirilmiştir. Au/T3T elektrodu ile Ph tayini için uygun olan destek elektrolit ve pH gibi optimum çalışma şartları belirlenmiştir. En uygun destek elektrolit ortamının pH 1.0 HClO4 çözeltisi olduğu belirlenmiştir. Au elektrot yüzeyinin T3T ile modifiye edilmesiyle, fenolün yükseltgenme pikinin akım değerinde 3,41 kat artış olduğu belirlenmiştir. Au/T3T modifiye elektrot ile Ph için çalışma aralığı 1,0´10-7–3,6´10-5 M ve gözlenebilme sınırı (LOD) 1,2´10-8 M olarak belirlenmiştir. Au/T3T elektrodunun Ph tayininde iyi bir tekrarlanabilirlik, kararlılık ve seçiciliğe sahip olduğu tespit edilmiştir. Modifiye elektrotla, musluk suyunda standart ekleme yöntemi kullanarak düşük bağıl standart sapma (BSS) ve iyi bir geri kazanım değerleri ile Ph tayini gerçekleştirilmiştir.

Anahtar Kelimeler:

Fenol, toksik, modifikasyon, elektrokimyasal davranış, voltametrik tayin

Investigation of the electrochemical behavior of phenol using 1H-1, 2, 4-triazole-3-thiol modified gold electrode and its voltammetric determination

In this study 1H-1,2,4-triazole-3-thiol (T3T) was deposited at the gold electrode to fabricate a new sensor andused for the determination of phenol (Ph). Comparing with the bare Au and T3T modified Au (Au/T3T)electrode, the Au/T3T electrode has higher catalytic activities towards the oxidation of Ph. Figure A showsthat electrode modification provided 3.41-fold increase at the precision.Figure A. Differential pulse voltammograms of Ph on the Au and Au/T3T electrode at pH 1.0 in HClO4solution (a), Possible oxidation mechanism of phenol (b).Purpose: The aim of this study to develop a new and applicable sensor in real samples used for thedetermination of phenol compound.Theory and Methods:Phenol is a kind of pollutant and it widely exists in water, atmosphere, chemical productions, and canned food.The phenol is potentially fatal if ingested, inhaled and absorbed by skin and may cause severe burns andinfluence kidney, liver and central nervous system. Therefore, determination of phenol is very important dueto its toxic and dangerous properties to enviromental and people’s health. The use of modified electrodes inanalytical applications has become an active research area in electrochemistry thanks to its low cost, rapidresponse, low detection limit, selectivity and high precision. Modification of electrode surfaces with redoxactive organic molecules that contain heteroatom has an important process. Among the coating molecules onelectrode surfaces, triazole and its derivatives have been preferred because of their advantages of having highredox activity and quietly good thermal stability.Results:The calibration curve and limit of detection (LOD) were obtained in the range of 1.0×10-7 – 3.6 ×10-5 mol L-1and 1.2×10-8 mol L-1 on the Au/T3T modified electrode, respectively. The interference effects of variousanions, cations and compounds on this method were investigated. Besides, the reproducibility, repeatability,and stability measurements were also assayed. In addition, the obtained electrode showed satisfactory resultswhen applied to the determination of Ph in tap water with low relative standart deviation values on the Au/T3Tmodified electrode by standard addition method.Conclusion:This study has indicated that the T3T modified Au electrode exhibits highly electrocatalytic activity to Phoxidation at pH 1.0 in HClO4 solution. The prepared electrode was successfully used to the determination ofPh in tap water.

Keywords:

Phenol, Toxic, Modification, Electrochemical behavior, Voltammetric determination,

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