Electrocatalytic determination of ascorbic acid using Cu(II) doped zeolite modified electrode
Publish place: Iran International Zeolite conference
Publish Year: 1389
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
ZEOLITE02_128
تاریخ نمایه سازی: 6 اسفند 1388
Abstract:
A new method is developed for the catalytic oxidation of ascorbic acid at graphite zeolite-modified electrode, doped with copper(II) (Cu2+A/ZCME). Copper(II) exchanged in zeolite type A acts as catalyst to oxidize ascorbic acid. The modified electrode lowered the overpotential of the reaction by ~400 mV. First, the electrochemical behavior of copper(II), incorporated in the zeolite type A modified electrode, was studied. The results illustrate that diffusion can control the copper(II)/copper(0) redox process at the Cu2+A/ZCME. Then, the behavior of electrocatalytic
oxidation reaction for ascorbic acid was researched. The electrode was employed to study electrocatalytic oxidation of ascorbic acid, using cyclic voltammetry and chronoamperometry as diagnostic techniques. The diffusion coefficient of ascorbic acid was equal to 1.028 ×10-5 cm2s-1. A
linear calibration graph was obtained over the ascorbic acid with a concentration range of 0.003–6.00 mmol L-1. The detection limit (DL) of ascorbic acid was estimated as 2.76×10-7 mol L-1. The relative standard deviations of 10 replicate measurements (performed on a single electrode at several ascorbic acid concentrations between 3.0 to 200 μmol L-1) were measured between 1.0 to 2.4% .
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Authors
Tahereh Rohani
Department of Chemistry, Payame noor University (PNU), Kerman, Iran
Mohammad Ali Taher
Department of Chemistry, Shahid Bahonar University of Kerman, Kerman, Iran
Amirkhosro Beheshti
Department of Chemistry, Payame noor University (PNU), Kerman, Iran
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