| 闭凤丽,尹华勤,甘峰.化学通报,2015,78(9):859-863. |
| 滴定分析终点误差计算公式之探讨 |
| Investigation of the Titration End Point Error Formula |
| 投稿时间：2014-12-28 修订日期：2015-02-14 |
| DOI： |
| 中文关键词: 终点误差 Ringbom公式 |
| 英文关键词:end point error, Ringbom formula |
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| 中文摘要: |
| 滴定分析终点误差的计算是分析教学中的一个非常重要的内容,通过终点误差的计算可以对滴定方法的准确度、指导指示剂的选择等做出评价。目前,国内几乎所有的分析化学教科书在介绍终点误差的计算时都直接采用了Ringbom公式。与此同时,国内的许多科学工作者对Ringbom公式进行相应的改进,并试图将其拓展到四大滴定分析中。然而,与此形成鲜明对照的是,国外的分析化学教材中却基本不提及Ringbom公式。本文对终点误差的计算公式进行了探讨。我们指出,(1)Ringbom公式在建立过程中采用了不恰当的基准,同时采用了近似处理,这使得它仅仅是一个近似公式,因而不应当对其有过度的倚重；(2)Ringbom公式向四大滴定的拓展值得商榷。我们建议,应该从终点误差的定义出发,以滴定终点体积比和化学计量点的体积比为基础,建立合理、准确和简洁的终点误差计算公式。 |
| 英文摘要: |
| The calculation of titration error is a very important content in the teaching of analytical chemistry, which provides the evaluation of titration accuracy and the guidance of proper indicator. So far, almost all domestic textbooks in analytical chemistry have directly applied Ringbom formula in the calculation of end point error. In the same time, many domestic scientific workers have tried to improve Ringbom formula and expand it into the Four Titration Analysis. However, in sharp contrast with domestic textbooks, the foreign textbooks of analytical chemistry almost do not mention Ringbom formula. In this paper, the calculation formula of end point error is discussed. We point out that (1) Ringbom formula adopts an inappropriate standard and uses an approximate treatment in its derivation process, which makes it is just an approximate formula and no worthy of excessive reliance on it；(2)The expanding of Ringbom formula to the Four Titration Analysis is still debatable. We suggest that the titration error formula should be established from the definition of end point error, and it should be based on the volume ratio end point and stoichiometric point,which will make it an reasonable, accurate and concise formula for end point error. |
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