Automation titrimetric analysis method and uses thereof

Abstract

The invention provides an automatic titration analysis method, including the following steps: (a) accurately measure adequate sample solution, insert the electrode for titration, add standard solution, and after the reaction balance, record the standard solution volume and negative logarithm value of the monitored ion activity; for redox titration, add three standard solutions, and after the reaction balance, respectively record the corresponding standard solution volume and electrode potential value; (2) input the above experimental data and the sample solution volume, standard solution concentration into the computer; (3) according to the titration type, the computer selects the corresponding calculation formula type to compute, to obtain the reaction quantity standard solution consumption volume or the sample solution initial concentration, and then outputs results. The invention applies to the conventional capacity analysis; or substitutes for some non-aqueous titration and expanding to the trace titration analysis and end-jump hidden titration analysis, and it is simple to operate, fast, less manual intervention, rapid analysis speed, high intelligent degree.

Description

technical field [0001] The invention relates to a capacity analysis method, in particular to an automatic titration analysis method and its application. Background technique [0002] With the rapid development of modern science and technology, the intersection and penetration between disciplines are increasing day by day, and many new technologies and methods have been produced, which have promoted the development of related disciplines. For example, in the field of analytical chemistry, the "differential spectrum analysis method for direct determination of multiple components" (authorized announcement number: CN1044740C) formed by combining light absorption analysis with computer; "automatic analysis method for spectral quantification" (authorized announcement No.: CN1235035C), etc. have all made the original related technology achieve remarkable progress and success in terms of simplicity, speed and automation. The invention combines the capacity analysis with a computer ...

AI Technical Summary

Problems solved by technology

[0005] In 1979, Horvai combined the direct potentiometric method with the potentiometric titration method, and proposed the single-point method of coordination titration; MidgleyD. et al. proposed the dilution potentiometric titration method; Ishikawa Tokuhisa proposed the fixed pH method, and Lin Wenru and Feng Junxian proposed the two-point titration method , these methods have made progress in simplifying the operation and shortening the analysis time, but they have put forward relatively high requirements for the conditions. If the titer is required to be as close to 1 as possible, double standard solutions are required, and the titrant is required to have a sufficiently high Concentration requires the reaction constant K value to be large enough, or the conversion coefficient S of the electrode is known, and the ΔE>18mV of two titrations is required, etc. The inventor has carried out experimental research on the above methods and found that in addition to satisfying the above requirements In addition to this strict condition, except that the titration point is just selected at the place where the titer tends to 1 (0.99<p<1.01), the results of other titration points have large errors. Difficult to accept, so it lacks operability in actual work and is difficult to apply

Recently, some scholars have applied some new mathematical methods to titration analysis. Cai Yudong reported the method of using the neural network model to find the end point near the end point; Li Zhiliang and others suggested using the Kaman filter method to improve the accuracy of the end point judgment; It is proposed to use continuous wavelet transform to determine the end point. These methods have introduced new ideas to the development of capacity analysis, but still take the titration end point as the research object, and have not solved the problem of simple, fast, intelligent and automated capacity analysis as soon as possible.

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