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利用计算机技术对实验测定的铋离子示差脉冲极谱数据进行了如下处理:1)用修正的Gaossian方程拟合实验测定的极谱曲线,得到精确至±0.05mV的极谱峰电位;2)用极谱数据计算机分析系统CFC-Ⅱ计算因Bi(OH)~(2+)络合物的形成而造成的极谱峰电位移动值;3)对校正过的金属离子极谱峰电位值进行多项式曲线拟合,得到整个pH区间铋离子(Bi~(3+))的示差极谱峰电位值。数据处理与分析结果表明:当溶液的pH<2.5时,可以利用关系式E_p(mV)=-0.252[pH]~4+5.8748[pH]~3-37.673[pH]~2+94.303[pH]+19.1计算科离子的极谱峰电位(相对于银/氯化银参比电极);当溶液的pH值在2.5以上时,铋离子的极谱峰电位为101.13mV
The experimentally measured bismuth ion differential pulse polarographic data were processed by the computer technique as follows: 1) The experimental polarographic curve was fitted with the modified Gaossian equation to get the polarographic peak potential to ± 0.05mV; 2) Polarographic data computer analysis system CFC-II calculated due to the formation of Bi (OH) 2 complex formation polarographic peak potential shift; 3) the calibration of the metal ion polarographic peak potential value polynomial Curve fitting, to get the bismuth ion (Bi ~ (3+)) of the entire pH range of the polarographic peak potential value. The data processing and analysis results show that when the pH of the solution is less than 2.5, the relationship E_p (mV) = -0.252 [pH] -4 + 5.8748 [pH] -3-37.673 [pH] -2 + 94.303 [pH] +19.1 Calculate the polarographic peak potential of the ion (relative to the silver / silver chloride reference electrode); when the pH of the solution is above 2.5, the peak potential of the bismuth ion is 101.13 mV