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0.1 mol/ L KNO3 空白液与 Cl-切换时 ,Ag Cl电极响应的瞬时电位信号峰高度 ΔEp 有非常好的再现性 ,4 0多天所测的 1 0次标准曲线电位平均偏差小于 2 .0 m V,ΔEp～p(Cl-)直线平均斜率为 55.4 m V,其平均偏差小于 1 .0 m V,电极响应下限和ΔEp～ p(Cl-)直线截距都与经 Ag Cl溶度积所计算的值一致 .瞬时信号峰电位上升时间小于 1 .5s,可实现小体积试液的快速准确分析 .用离子水合吉布氏自由能 ΔGh(Cl-)的变化解释了瞬时信号不同阶段的电位变化速度 .实验中使用自制的活度阶梯自动切换装置 ,该装置具有容积比为 4∶ 1的空白液和试液两个注射泵 .用该法已测定了维生素 B6的含量
0.1 mol / L KNO3 blank solution and Cl- switch, Ag Cl electrode response instantaneous potential peak height ΔEp has a very good reproducibility, 4 0 days measured 10 standard curve potential average deviation of less than 2.0 The average linear slope of mV and ΔEp ~ p (Cl-) is 55.4 mV, and the average deviation is less than 1.0 mV. The lower limit of electrode response and the linear intercept of ΔEp ~ p (Cl-) The calculated values are consistent.The instantaneous signal peak rise time is less than 1.5s, which can realize the rapid and accurate analysis of the small-volume test solution.During the different phases of the transient signal, the changes of Gibbs free energy ΔGh (Cl-) Potentials change rate: In the experiment, a self-made activity ladder automatic switch device is used, which has a volumetric ratio of 4: 1 blank solution and two syringe pumps.It has been determined by this method that the content of vitamin B6