新的电位滴定终点识别方法

提出了只需两组滴定数据即可计算电位滴定化学计量点的新的电位滴定终点识别方法,并可以对计算结果进行误差判断。此方法是在两点法的基础上,可用较大的电位间隔进行滴定操作的新电位滴定方法。试验结果表明,对任意滴定体系,一般只需测定3~4组滴定数据即可得到符合误差要求的计算结果,通过大量试验表明,此方法结果与二次微分法的结果一致,且具有较高的精密度与准确度。分析速度较经典电位滴定法有较大提高。

New Method for Determination of the Endpoint of Potentiometric Titration

It was proposed that the equivalent point of potentiometric titration can be determined more conveniently and simply by taking only 2-4 sets of data at appropriate stages in the course of titration and by calculation according to the formula of the two-points method.And the error aroused from the calculation was also discerned.The proposed method can be operated in relatively large potential intervals,and the results obtained were in conformity with the results obtained by the conventional potentiometric titration with data treatment by 2nd order derivation.The accuracy and precision of the present method were proved by experimental data.The speed of analysis was also remarkably raised.