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Detection method based on reaction process control

A technology of reaction process and detection method, which is applied in the direction of chemical analysis by titration method, can solve the problems of potential detection system instability, large indication error, uncontrollable reaction process, and many by-products of manganese dioxide, etc., to achieve improvement Accuracy and stability, improve the accuracy of temperature measurement, the effect of small amount of waste liquid

Pending Publication Date: 2022-01-11
FOCUSED PHOTONICS
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Other manufacturers also use the potentiometric method for the determination of permanganate index. However, compared with this, other manufacturers have many problems such as the inability to adjust the titration rate according to the reaction process, the production of more manganese dioxide by-products, and the difficulty in controlling the stable oxidation rate.
Due to the uncontrollable reaction process, it is difficult to judge the titration end point, and a single, fixed titration end point method will further aggravate the instability of the potential detection system and the large indication error, especially when the measurement composition is more complicated. Water samples or It is particularly difficult for national standard substances

Method used

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Embodiment 1

[0029] The detection method based on the reaction process control of the embodiment of the present invention, the detection method based on the reaction process control includes a reaction stage and a titration stage; as figure 1 As shown, the titration phase includes the following steps:

[0030] (A1) Add the first reagent to the sample, then drop the second reagent at a fixed titration rate until the reaction is complete, and obtain the number of drops N corresponding to the sample 0 ;

[0031] (A2) Add the first reagent to the sample to obtain the potential value V 10 , then drop the second reagent, record the number of drops N and the potential value V of the second reagent;

[0032] (A3) Determine the process according to the obtained potential value V;

[0033] like and Titration is in the first process, V 0 is the potential value of the first reagent, V t is the potential value of the second reagent; It is the derivative of the potential value V to the number...

Embodiment 2

[0069] An application example of the detection method based on reaction process control in water quality analysis according to Example 1 of the present invention.

[0070] In this application example, the first reagent is sodium oxalate, and the second reagent is potassium permanganate and sulfuric acid, which are gradually dropped into the reaction chamber, and each drop has the same volume;

[0071] The center of the bottom end of the reaction chamber has a through hole, and the pipeline communicates with the through hole. The pipeline is used to inject liquid and air (for stirring) into the reaction chamber respectively, and to discharge waste liquid. The pipeline passes through the rotating disk and the support; the rotating disk adopts a gear , arranged on the bracket and at the lower side of the reaction chamber, the pipeline passes through the rotating disk; the magnet is arranged on the rotating disk, and the connecting line between the two magnets passes through the ro...

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Abstract

The invention provides a detection method based on reaction process control. The detection method comprises a reaction stage and a titration stage, wherein the titration stage comprises the following steps: (A1) adding a first reagent into a sample, and dropwise adding a second reagent at a fixed titration rate until the reaction is complete, so as to obtain a drop number N0 corresponding to the sample; (A2) adding the first reagent into the sample to obtain a potential value V10, dropwise adding the second reagent, and recording the drop number N and the potential value V of the second reagent; (A3) determining a process according to the obtained potential value V; (A4) adjusting the titration rate according to the process and the change of the potential value. The method has the advantages of accurate detection and the like.

Description

technical field [0001] The invention relates to the technical field of titration, in particular to a detection method based on reaction process control. Background technique [0002] In the market, some manufacturers use spectrophotometry to measure permanganate index. Compared with the detection system composed of monochromatic light source, sensor and filter, the potentiometric permanganate index has higher versatility and accuracy in dealing with high turbidity and high chromaticity of samples. The determination of permanganate index by other manufacturers also uses the potentiometric method. However, compared with this, other manufacturers have many problems such as the inability to adjust the titration rate according to the reaction process, the formation of more manganese dioxide as a by-product, and the difficulty in controlling the stable oxidation rate. Due to the uncontrollable reaction process, it is difficult to judge the titration end point, and a single, fixed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 杨朋飞黄凯周新星
Owner FOCUSED PHOTONICS
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