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Automatic potentiometric titration capable of automatically judging terminal point

A potentiometric titration and automatic judgment technology, applied in the field of electrochemical analysis, can solve the problems of slow analysis speed and low precision, and achieve the effect of fast speed, high precision, and simple and easy operation.

Inactive Publication Date: 2003-01-22
SHANGHAI PRECISION SCI INSTR
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Problems solved by technology

[0003] The present invention provides an automatic potentiometric titration method capable of automatically judging the end point in order to solve the existing technical problems of slow analysis speed and low precision of the existing automatic potentiometric titration method, especially the end point judgment.

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  • Automatic potentiometric titration capable of automatically judging terminal point
  • Automatic potentiometric titration capable of automatically judging terminal point
  • Automatic potentiometric titration capable of automatically judging terminal point

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Embodiment Construction

[0008] The present invention only slightly improves the existing automatic potentiometric titration instrument, and mainly relies on the automatic potentiometric titration operating program software to control the measurement and analysis process.

[0009] Such as figure 2 As shown, the pre-programmed common titration mode and pre-titration mode are stored in the memory of the instrument microcomputer, and any kind of titration analysis can be performed with the pre-titration mode.

[0010] Select the pre-titration mode (as in step S 1 ); add a small amount of titrant again, measure the current potential E, calculate a differential value E' (as in step S 2 , S 3 , S 4 ); Calculate the addition ΔV of titrant next time by formula (1) (as step S 5 ); Judging whether the titration end point is reached (as in step S 6 ); if the primary differential value does not reach the maximum value, then add ΔV titrant again, measure the current potential E, calculate the differential va...

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Abstract

The present invention relates to electrochemical analysis technology and especially one automatic potentiometric titration capable of automatically judging end point. The titration process includes selecting titration mode, adding titrating agent, measuring present potential, calculating first order differential value, calcualting the volume of added titrating agent, judging the end point, endingthe titration, displaying the titration results and storing the titration curve. Meanwhile, the titration mode is selected in the computer, and the titration curve may be used as the titration mode for next similar titration analysis. The present invention has the advantages of fast titration speed, high precision, automatic titration process and simple operation process.

Description

technical field [0001] The invention relates to electrochemical analysis technology, in particular to an automatic potentiometric titration method capable of automatically judging the end point. Background technique [0002] Potentiometric titration is a quantitative electrochemical analysis method. The potentiometric titrator determines the change of the measured ion concentration by measuring the change of the potential during the titration process, forms a titration curve, and determines the titration end point according to the "jump" of the potential , this method and its device are widely used in various component analysis in metallurgy, pharmacy, environmental protection, scientific research and other fields. The key of the automatic potentiometric titration method is the judgment of the titration end point. At present, two methods are used: (1) The method of using the preset end point. This method must know the end point potential of the titration in advance. After se...

Claims

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Application Information

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IPC IPC(8): G01N27/26
Inventor 金春法宋翔鹰魏乐樵
Owner SHANGHAI PRECISION SCI INSTR
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