کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10269152 459718 2011 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Characterization of the surface redox process of adsorbed morin at glassy carbon electrodes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Characterization of the surface redox process of adsorbed morin at glassy carbon electrodes
چکیده انگلیسی
The thermodynamic and kinetics of the adsorption of morin (MOR) on glassy carbon (GC) electrodes in 0.2 mol dm−3 phosphate buffer solutions (PBS, pH 7.00) was studied by both cyclic (CV) and square wave (SWV) voltammetries. The Frumkin adsorption isotherm was the best to describe the specific interaction of MOR with GC electrodes. The SWV allowed to characterize the thermodynamic and kinetics of surface quasi-reversible redox couple of MOR, using the combination of the “quasi-reversible maximum” and the “splitting of SW net peaks” methods. Average values obtained for the formal potential and the anodic transfer coefficient were (0.27 ± 0.02) V and (0.59 ± 0.09), respectively. Moreover, a value of formal rate constant (ks) of 87 s−1 for the overall two-electron redox process was calculated. The SWV was also employed to generate calibration curves, which were linear in the range MOR bulk concentration (cMOR*) from 1.27 × 10−7 to 2.50 × 10−5 mol dm−3. The lowest concentration experimentally measured for a signal to noise ratio of 3:1 was 1.25 × 10−8 mol dm−3 (3 ppb).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 56, Issue 5, 1 February 2011, Pages 2321-2327
نویسندگان
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