Automatic determination and calculation method of photometric automatic titration
A calculation method and automatic titration technology, which are applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by causing chemical reactions to occur in materials, can solve the problem of limiting the effective promotion and application of photometric automatic titration devices, and the titration process. The problems of high requirements and large amount of reagents can reduce the consumption of reagents, improve the precision, and realize the effect of miniaturization.
Active Publication Date: 2017-12-08
DELIN ENVIRONMENTAL PROTECTION TECH
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Problems solved by technology
[0004] The titration reaction in the laboratory has high requirements on the titration process, manual operation often titrates too much, and consumes a large amount of reagents
Nowadays, automatic titration devices are often used to complete the titration process, but the automatic determination of titration termination and titration end point and automatic calculation of titration results in photometric automatic titration devices have not been fully realized, which limits the effective promotion and application of photometric automatic titration devices
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[0032] The technical scheme of the present invention will be described in detail below by taking the titration of COD as an example.
[0033] Such as figure 1 The process is shown as an automatic determination and calculation method of photometric automatic titration, including titration termination determination method, titration end point determination and calculation method:
[0034] Use photoelectric equipment to measure the signal N after the light source passes through the liquid to be tested, and record the time signal curve Q;
[0035] The method for judging the termination of the titration is: after the titration starts, record the signal N during the titration immediately, and compare the N value with the average value O of the signal within A seconds after the start of the titration, if N≥O+P, continue the titration, if N image 3 The mutation initial value and the mutation terminal value mean) are compared with the mutation terminal value (such as image 3 5≤B≤20...
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Abstract
The invention discloses an automatic determining and calculating method of photometric automatic titration, and belongs to the field of automatic analysis apparatuses. The method comprises a titration ending determination process, and a titration end point determining and calculating process. A maximum mutation wavelength is selected as a light source wavelength according to color mutation in titration, titration ending is determined on the basis of a preliminary examination mean value, and the titration end point is determined on the basis of signal differential. The method can realize automatic determination of the titration ending in the photometric automatic titration process, can realize automatic determination of the titration mutation point, and allows the reagent consumption to be calculated and even an amount to be measured to be directly calculated. The method has high precision, and is in favor of realizing miniaturization, automation and intelligentization of an automatic titration apparatus.
Description
technical field [0001] The invention relates to determination and calculation of titration, in particular to an automatic determination and calculation method of photometric automatic titration. Background technique [0002] Titration is a method of adding the standard solution to the analyzed solution gradually, and determining the reaction end point by the color, precipitation or conductivity change caused by the component to be tested, titrant, and reaction product during the titration process, and analyzing the composition of the solution. . According to different principles of titration end point determination, titration can be divided into photometric titration, potentiometric titration, coulometric titration, etc.; according to different reaction principles, it can be divided into acid-base, redox, precipitation or complexometric titration, etc. [0003] Photometric titration is to titrate a certain amount of standard solution into the solution to be tested, measure ...
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IPC IPC(8): G01N21/79
CPCG01N21/79
Inventor 张欢洪陵成王涛胡志强
Owner DELIN ENVIRONMENTAL PROTECTION TECH