Low-detection-limit detection method for ClO2 <-> in water

A detection method and detection limit technology, applied in chemical method analysis, measuring device, chemical analysis by titration method, etc., can solve the problem of unfavorable chloride ion detection widely popularized and applied, high detection limit concentration, high detection limit question
CN113740484AActive Publication Date: 2021-12-03北京市科学技术研究院分析测试研究所(北京市理化分析测试中心) +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
北京市科学技术研究院分析测试研究所(北京市理化分析测试中心)
Publication Date
2021-12-03

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Abstract

The invention relates to a low-detection-limit detection method for ClO2 <-> in water, which uses a photo-thermal potential analyzer and comprises the following steps: S100, preparing a ClO2 <-> solution by using distilled water, adding a phosphate buffer solution into the ClO2 <-> solution, and adjusting the pH value to 6-8; S200, adding potassium iodide into the solution obtained in the step S100, and dissolving to obtain a solution to be reacted; S300, adjusting the pH value of the to-be-reacted solution to 2-3 to obtain a reaction solution, and immediately putting the reaction solution in a dark place to react for 5-6 minutes; S400, adjusting the pH value of the solution obtained in the step S300 to 3-5, simultaneously adding a starch indicator and potassium iodide, mixing and dissolving, and immediately titrating by using a sodium thiosulfate standard solution when the photometric electrode starts to feed back a signal; and S500, recording the volume of the consumed sodium thiosulfate standard solution at the titration end point, and calculating the concentration of ClO2 <-> in water.
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Description

technical field

[0001] The invention belongs to ClO in water 2 - Content determination technical field, be specifically related to a kind of ClO in water 2 - detection method with a low detection limit. Background technique

[0002] For the detection of various chloride ions in drinking water, especially ClO in water 2 , Cl 2 , ClO 2 - , and ClO 3 - Those skilled in the art have studied the continuous iodometric method, and have explored a test method for the mutual conversion or reaction between the above-mentioned multiple valence states of chloride ions. However, for ClO alone in water 2 - There are still problems in the detection, the most prominent problem is its high detection limit concentration. Currently, ClO in water 2 - The concentration needs to reach 0.2mg / L before it can be detected by the iodometric method. For a small amount of ClO in water 2 - Therefore, the detection limit is relatively high, which is not conducive to the in-depth research a...

Claims

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