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用阴极射线示波器荧光屏上荧光点的位移代替检流计指针的偏转来指示滴定终点的双安培滴定方法称为示波双安培滴定法。与检流计相比较,示波器灵敏度高,终点更加明确。示波双安培滴定的装置如图1所示,将外加电压(150—600mV)直接加于两个铂电极上并将示波器输入端直接串联于线路中即可。使用SR—071A型长余辉示波器的直流档直接输入时,灵敏度为5mV/cm,输入阻抗为1兆欧,其电流检测灵敏度为I_s=V_s/R=(5×10~(-3))/10~6=5×lO~(-9)A/cm,比常用检流计灵敏。
Double-titration titration with the displacement of the fluorescent spot on the cathode ray oscilloscope screen instead of the deflection of the galvanometer pointer is referred to as oscillometric double amperometric titration. Compared with the galvanometer, the oscilloscope high sensitivity, the end point is more clear. Oscillographic dual amp titration device shown in Figure 1, the applied voltage (150-600mV) directly to the two platinum electrodes and the oscilloscope input directly in series in the line. When the direct-current input of the SR-071A long afterglow oscilloscope is used, the sensitivity is 5mV / cm and the input impedance is 1 megaohms. The current detection sensitivity is I_s = V_s / R = 5 × 10 -3 / 10 ~ 6 = 5 × lO ~ (-9) A / cm, sensitive than the common galvanometer.