Method for measuring dissolved oxygen of water body by flow-injection chemiluminiscence mode

A technology of chemiluminescence and flow injection, which is applied in the direction of chemiluminescence/bioluminescence, and analysis through chemical reactions of materials, which can solve the problems of poor data reproducibility, cumbersome operation, and low accuracy, and achieve the degree of automation High, high sensitivity, guaranteed accuracy effect

Active Publication Date: 2012-11-21
OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI
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Problems solved by technology

[0004] The invention provides a method for measuring dissolved oxygen in water body by means of flow injection chemiluminescence, which can solve the problems existing in the prior art such as cumbersome operation, large error, poor data reproducibility, and low accuracy.

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  • Method for measuring dissolved oxygen of water body by flow-injection chemiluminiscence mode

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Embodiment Construction

[0031] see figure 1 and figure 2 , the method of the present invention comprises the following steps:

[0032] (1) the water sample to be measured delivered by the peristaltic pump 2 at a flow rate of 0.05ml / min;

[0033](2) After the water sample flows through a section of the pipeline under the action of the water sample peristaltic pump 2, it is first mixed with the hydrogen peroxide solution delivered by the peristaltic pump 3. The hydrogen peroxide solution mainly provides oxygen atoms to dissolve in the water body Oxygen combines to generate ozone, because ozone can oxidize luminol to produce chemiluminescence. The flow rate of hydrogen peroxide solution is 0.5ml / min, and the concentration is 0.2mol / L;

[0034] (3) The water sample solution mixed with hydrogen peroxide continues to flow in the pipeline. After flowing for a certain distance, it is mixed with the acid buffer solution delivered by the acid buffer solution peristaltic pump 5. The acid buffer solution is ...

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Abstract

The invention provides a method for measuring the dissolved oxygen of a water body by a flow-injection chemiluminiscence mode. The method comprises the following steps: (1) a water sample pump conveys measured water body solution; (2) the water body solution is mixed with hydrogen peroxide solution; (3) the solution mixed with hydrogen peroxide is mixed with acid buffer solution, and then enters a cooling pipe; (4) the mixed solution flows out of the cooling pipe, is mixed with luminal solution and alkaline buffer solution in an alkaline buffer solution pipeline and flows into a detection room; and (5) a photomultiplier acquires and amplifies light signals emitted by passed solution, converts the light signals into electric signals, and conveys the electric signals into a microcomputer data processing system, and the microcomputer data processing system quantizes the signals, and calculates the concentration of the dissolved oxygen in the water body. The method provided by the invention has the advantages of high sensitivity, wide linear range, fastness, good reproducibility, high automation degree and high accuracy and the like.

Description

technical field [0001] The invention belongs to the technical field of environmental chemical monitoring, specifically based on the phenomenon that luminol can be oxidized by ozone to produce chemiluminescence, using flow injection technology, oxygen atoms generated by hydrogen peroxide combine with dissolved oxygen in water to form ozone, A method for measuring the concentration of dissolved oxygen in water using the difference in the intensity of chemiluminescence produced by ozone oxidation of luminol. Background technique [0002] In the fields of environmental water quality monitoring, aquaculture, wastewater treatment, sewage aeration, boiler water deoxygenation, dissolved oxygen control in fermentation industry, metal element extraction, etc., dissolved oxygen in water is an important water quality parameter, so the measurement method of dissolved oxygen is very important. important. At present, the commonly used methods include iodometric method, electrochemical met...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/76
Inventor 刘岩马然赵娜张述伟褚东志赵斌石小梅张颖刘东彦范萍萍吕靖高杨任国兴曹璐张婷邹涛王洪亮曹煊张颖颖汤永佐程岩侯广利
Owner OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI
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