cie 1976l prepared in sodium hydroxide solution for chemical analysis * a * b * color space method

Abstract

The invention provides a CIE1976L * a * b * color space method for sodium hydroxide solution preparation for chemical analysis and belongs to the technical field of measurement. The CIE1976L * a * b * color space method for sodium hydroxide solution preparation for chemical analysis at least comprises the steps that a sodium hydroxide reagent with the concentration to be detected is continuously added into a reaction container where a solution with phenolphthalein indicator is added, the color space method is utilized for measuring color changes of the chemical reaction solution with the phenolphthalein indicator, and digital end point titration is carried out. By means of the method, the color of the chemical reaction solution with the phenolphthalein indicator is digitally measured, the test steps are simple, and automatic and batch large-scale detection can be achieved.

Description

technical field [0001] The present invention relates to a kind of CIE1976 (L) prepared by sodium hydroxide solution for chemical analysis * a * b * ) color space preparation method, which belongs to the technical field of measurement. Background technique [0002] In chemical analysis, the preparation of sodium hydroxide standard solution is an extremely important basic work in chemical analysis. The accuracy of its content determines the accuracy of other test results, and it is an indispensable and important link in titration analysis. [0003] At present, the preparation methods at home and abroad are all artificial visual methods, which is to describe the instant color changes in the preparation process in words according to the procedure of "visual experience→thinking judgment→language description", and the color representing the end point is understood by the operator himself. [0004] The judgment of the end point is marked by the discoloration of phenolphthalein. ...

AI Technical Summary

Problems solved by technology

[0006] 1) The sensitivity of the human eye to different colors affects the judgment of the color of the titration end point, resulting in deviations in the results

[0007]2) The physiological threshold difference of age and race makes it difficult to grasp some color differences, even for trained skilled personnel;

[0008] 3) Operators have different understanding of language, resulting in inconsistency in titration end point color

[0009] 4) The visual error between the operators may completely lead to the deviation of the experimental results, and the judgment error of the end point is relatively large

[0010] 5) Different titration environments have a great impact on the operator's vision

[0011] 6) The titration process and end point information can only be described in words, there is no digital information, the value cannot be transmitted, and it is difficult to trace back

[0012] 7) When learning and teaching, only the face-to-face teaching method of master and apprentice can be used to determine the color of the end point

[0013] 8) High labor intensity and easy to produce visual fatigue, which affects the accuracy of the results

[0014] 9) It is difficult to improve the detection accuracy due to the large influence of the environment and the slow response of the end point

[0015] 10) The test steps are cumbersome, and it is impossible to realize automated and batch detection scale

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