【摘要】 本文对胞嘧啶在滴汞电极上的示差脉冲极谱波的性质进行了研究,探讨了电极反应过程,推导了相应的脉冲极谱电流方程式,理论与实验结果完全相符.更多还原

【Abstract】 The differential pulse polarography of oytosine has been studied.It is found that in0.1M HOAc-NaOAc buffer solution（pH=4.2）on DME cytosine shows a single reductionpeak whioh obeys the following equation,i_r=i_adsx+i_（?）ff（1-x）=0.480 nFm^2/3t₁²C_M^*（?）whereΨ=（θ₁-θ₂）/（1+θ₁）（1+θ₂）;θ₁=exp （nF）/（RT）（E-E’）;θ₂=θ₁exp （nF）/（RT）⊿E;E’=E⁰+RT/nF·ln（D_R/D₀）^1/2+RT/nF ln0.81 K （?） [H⁺]^3/2In these equations,C_M^* denotes the bulk concentration of cytosine,K,k_? are thechemieal equilibrium constant and the rate constant of chemical reaction respectivelyand β is related to x by the following equationx-（β-1）/[0.858+0.142（β-1）]The β value has been determined experimentally and the value of x calculated fromthe equation was 0.290.The diffusion coefficient value（D）of cytosine agrees with thatobtained by the D.C.polarographic method.The theoretical values of the differential pulse polarographic currents were calcula-ted by means of the above equation and it is found that the experimental values agreewith the theoretical ones.更多还原