A study of the electrochemical oxidation of hydrogen peroxide on a platinum rotating disk electrode in the presence of calcium ions using Michaelis-Menten kinetics and binding isotherm analysis

Emad A. Khudaish*, Wafaa R. Al-Farsi

*المؤلف المقابل لهذا العمل

نتاج البحث: المساهمة في مجلةمراجعة النظراء

4 اقتباسات (Scopus)

ملخص

The present work demonstrates a potential suppression in the electrochemical signal of H2O2 oxidation due to the presence of Ca2+ ions. A mechanistic scheme was proposed to include a reversible interaction of Ca2+ ions with either the electrode surface binding sites (competitive) or the complex sites (non-competitive). The degree of inhibition was inspected by evaluating the kinetic currents as a function of [Ca2+] applying Koutecky-Levich kinetics. These observations were further supported with models based on enzyme kinetics such as Michaelis-Menten model applying Lineweaver-Burk plot along with non-linear least-square fitting analysis. The experimental results suggests that the strength of the complex binding sites decreases considerably with increasing [Ca2+] and that a single H2O2 molecule is required to combine with one available active binding site.

اللغة الأصليةEnglish
الصفحات (من إلى)4302-4308
عدد الصفحات7
دوريةElectrochimica Acta
مستوى الصوت53
رقم الإصدار12
المعرِّفات الرقمية للأشياء
حالة النشرPublished - مايو 1 2008

ASJC Scopus subject areas

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بصمة

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