A method and an apparatus for end point detection in titration analysis

Abstract

The invention discloses a method and an apparatus for end point detection in titration analysis. The method mainly comprises detecting the wavelength of transmission light of a test solution, and then based on the complementary color principle, showing the color of the test solution in the form of a wavelength of a color the same with the color, thereby to determine the end point of the titration analysis. The device comprises a sealing case, a small door is arranged on the box for placing the test solution to the sealing case, a small hole of a suitable size is disposed on the small door so that it is convenient for a person to dropwise add a standard solution into the test solution by a dropping device through the small hole, a magnetic stirrer is arranged below the small door, the test solution is placed on the magnetic stirrer, a while-light-emitting device is arranged beside the test solution to provide while light beam, a light wavelength detection device for detecting the wavelength of transmitted light of the test solution is arranged at the light-transmitting side of the test solution, the light wavelength detection device is electrically connected with a control cabinet, and the display screen of the control cabinet is arranged on the sealing case. According to the method and the apparatus, human errors are minimized, measurement precision is high, costs are low, reproducibility is good, and popularization is easy.

Description

technical field [0001] The invention belongs to the technical field of titration analysis. Specifically, the invention relates to a method and a device for judging the end point of chemical titration analysis with color change as the titration end point. Background technique [0002] At present, in the chemical titration analysis with the color change as the end point of the titration, there are two main methods for determining the end point of the titration analysis: one is to observe the color change of the solution with the naked eye to determine the end point of the titration, and the other is to use a photoelectric conversion system to detect the solution to be tested. The change in absorbance from which the end point of the titration is determined. [0003] Obviously, the two methods mentioned above all have defects that cannot be ignored: the method of artificially observing the color change of the solution with the naked eye to determine the titration end point is di...

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Problems solved by technology

[0003] Obviously, the two methods mentioned above all have defects that cannot be ignored: the method of artificially observing the color change of the solution to determine the titration end point is difficult to accurately judge the titration end point, the accuracy is low, the error is large, and the reproducibility is poor; The method of judging the end point of the titration by the change of the absorbance of the solution to be tested has a complex system, high cost and is difficult to popularize.

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