Determination of Lead Ion by a Modified Carbon Paste Electrode Based on SiO₂ Nanoparticles, Ionic Liquid and Ionophore (N, N', N -Tricyclo Hexil Phosphoric Triamid) by Potentiometric Method

سال انتشار: 1395
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 532

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شناسه ملی سند علمی:

TCPCO03_205

تاریخ نمایه سازی: 16 شهریور 1395

چکیده مقاله:

The aim of this study was the determination of lead ion concentration by Carbon Paste Ion Selective electrode. The electrode response characteristics have been investigated.Material and methods: The Carbon Paste Electrode (CPE) contains Graphite powder, Nanoparticles, Ionophore and Ionic liquid. The potential measurements were carried out with a Potentiometer. The selectivity of the electrode towards different cationic species was evaluated by Separate Solution Method (SSM).The results: Among the different compositions studied, the carbon paste incorporating 60% graphite powder, 29% Ionic Liquid, 5%Ionophore and 6%Nanoparticles exhibit the best response characteristics. The electrode exhibits a linear response to Pb (II) over a concentration range (1.0×10−8 – 1.0×10−1) with a Nernstian slope of 30.03 MV per decade. It has a short response time (about 5 s). The detection limit of this electrode was 8.0×10−6 M. The potential remains constant in the range of PH=7-11. Conclusion: The suggested electrode was successfully used as an indicator for potentiometric determination of Pb (II) in water samples. It was characterized by good analytical parameters: low detection limit, high sensitivity, wide measuring range, wide pH range. All selected cations would not affect the selectivity of the present Lead electrode

نویسندگان

A Vahedi

BSc .MSc, Department of chemistry, Mashhad Branch, Islamic Azad University

M Ebrahimi

PhD Department of chemistry, Mashhad Branch, Islamic Azad University