Adsorptive Voltammetric Behavior of Riboflavine Tetrabut yrate and Its Measurement of Rate Constant at the Mercury Electrode
- VernacularTitle:核黄素丁酸酯在汞电极上的吸附伏安特性及其反应速率常数的测定
- Author:
Hongyan GAO
;
Yinglin ZHOU
;
Yonghuai ZENG
- Publication Type:Journal Article
- From:
Chinese Journal of Analytical Chemistry
2001;29(6):667-670
- CountryChina
- Language:Chinese
-
Abstract:
Cyclic voltammetry shows that, in a supporting ele ctrolyte of NaOH,riboflavine tetrabutyrate（RT）has a pair of cathodic and anodi c peaks at Hg electrode. The peak potentials Epc=Epa=-0.64 V（vs.Ag/Agcl）. The adsorptive characteristics of RT are explored in detai ls with various methods. The adsorbed species is most probably neutral molecule of RT.The saturated adsorption amount of RT at Hg electrode is 5.42×10-11 mol/cm2 and every RT molecule occupied 3.06 nm2. On the surface of HMDE ，the adsorption of RT obeys Frumkin dasorption isotherm. The adsorptive coeffic ient β，the attractive factor γ are 4.60×105，1.10 and the adsorption free energy ΔG, is －32.30 kJ/mol, respectively. The electrode proc ess kinetic behavior has also been studied by using cyclic voltammetry. Under th e experimental conditions the rate constants for electron transfer are determine d. The values of ks are in good agreement with literature′s results.
