Adsorptive voltammetric behavior of riboflavine tetrabutyrate and its measurement of rate constant at the mercury electrode

作者：Gao HY; Zhou YL; Zeng YH^*

来源：Chinese Journal of Analytical Chemistry, 2001, 29(6): 667-670.

• riboflavine tetrabutyrate
• adsorptive voltammetric behavior
• electrochemical characteristics
• rate constant
• cyclic voltammetry

Cyclic voltammetry shows that, in a supporting electrolyte of NaOH, riboflavine tetrabutyrate (RT) has a pair of cathodic and anodic peaks at Hg electrode. The peak potentials E-pc = E-pa = - 0.64 V(vs. Ag/Agcl). The adsorptive characteristics of RT are explored in details 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 x 10(-11) mol/cm(2) and every RT molecule occupied 3.06 nm(2). On the surface of HMDE, the adsorption of RT obeys Frumkin dasorption isotherm. The adsorptive coefficient beta, the attractive factor gamma are 4.60 x 10(5), 1.10 and the adsorption free energy DeltaG ';, is - 32.30 kJ/mol, respectively. The electrode process kinetic behavior has also been studied by using cyclic voltammetry. Under the experimental conditions the rate constants for electron transfer are determined. The values of k(s) are in good agreement with literature';s results.

• 出版日期2001-6
• 单位北京师范大学