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
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
The thermodynamic and kinetics of the adsorption of morin (MOR) on glassy carbon (GC) electrodes in 0.2 mol dmâ3 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 sâ1 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 Ã 10â7 to 2.50 Ã 10â5 mol dmâ3. The lowest concentration experimentally measured for a signal to noise ratio of 3:1 was 1.25 Ã 10â8 mol dmâ3 (3 ppb).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 56, Issue 5, 1 February 2011, Pages 2321-2327
Journal: Electrochimica Acta - Volume 56, Issue 5, 1 February 2011, Pages 2321-2327
نویسندگان
Alvaro Yamil Tesio, Adrian Marcelo Granero, Héctor Fernández, MarÃa Alicia Zón,