酸标准溶液标定方法改进探讨

Discussion on Improvement of the Acid Standard Solution Titration Method

目的:改进酸标准溶液标定方法。方法:在用GB601—2002方法配制时,尝试用三羟甲基氨基甲烷(THAM)作基准物,采用MATLAB小波工具箱函数确定滴定终点(化学计量点)并计算标准溶液浓度。结果:THAM作基准物可行,且电位滴定——小波变换法用于标定终点检测,其所得结果与手工滴定结果经统计分析,有95%的把握认为两种方法所得结果无显著差异。结论:电位滴定——小波变换法确定终点比手工指示剂法准确、简单、方便。

Objective： To improve the method for titration of standard acid solution. Methods According to interna- tional standard GB601 -2002, this experiment was used THAM as standard substance and applied the MATLAB Wavelet Toolbox functions to calculate the concentration of standard solution so as to determine the end point of ti- tration. The effectiveness of Potentiometric titration and Manual titration were compared. Results To use THAM as standard substance is feasible and the results dont reject the null hypothesis in the 95% confidence interval in both methods. Conclusion To determine the end point of titration, the Potentiometric titration -wavelet transform method is more accurate, easily manipulated and convenient than Manual titration.