论文部分内容阅读
在NH_3-NH_4Cl底液中,噻利洛尔(Celiprolol,简称CEL)在汞电极上有一线性扫描还原峰,峰电位E_(pc)=-1.31V(vs.Ag/AgCl),该峰具有明显的吸附性.当CEL浓度较小时,扫速较快,搅拌富集时间较长时,电极反应完全为吸附态的CEL的还原所控制,吸附粒子为CEL中性分子,测得CEL在汞电极上的饱和吸附量为1.03 ×10~(-10) mol/L,每个CEL分子所占电极面积为1.57nm~2,CEL在悬汞电极上的吸附符合Langmuir等温式.测得吸附系数β=1.08×10~6,电子转移数(n)为2,不可逆吸附的电子转移系数(α)为0.74,表面电极反应的速率常数k_(?)=0.40/s.探讨了CEL在汞电极上的还原机理,并建立了吸附伏安法测定CEL的最佳条件,检出限为1.0×10~(-9)mol/L.
In the NH_3-NH_4Cl solution, Celiprolol (CEL) showed a linear decrease at the mercury electrode with a peak potential of E_ (pc) = -1.31 V (vs. Ag / AgCl) When the CEL concentration is small, the sweep speed is faster, the enrichment time is longer, the electrode reaction is completely controlled by the reduction of the adsorbed CEL, the adsorbed particles are CEL neutral molecules, and the CEL is measured at the mercury electrode The adsorption capacity of CEL on the mercury electrode was in accordance with the Langmuir isotherm, and the adsorption coefficient β was found to be 1.03 × 10 ~ (-10) mol / L and 1.57 ~ = 1.08 × 10 ~ 6, the electron transfer number (n) is 2, the irreversible adsorption electron transfer coefficient (α) is 0.74, and the rate constant of surface electrode reaction is k = 0.40 / s. The optimum conditions for the determination of CEL by voltammetry are established. The detection limit is 1.0 × 10 -9 mol / L.