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A Dissolved Oxygen Detection Method Based on Optical Microfluidic Laser

A dissolved oxygen detection and laser technology, applied in the field of sensing, can solve the problems of cumbersome preparation and calibration of sodium thiosulfate, expensive fluorescence quenching detection device, inaccurate end point judgment, etc., so as to avoid high price and high reliability , the effect of pollution-free consumption

Active Publication Date: 2022-01-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the existing detection methods for dissolved oxygen include iodometric method, oxygen electrode method, and fluorescence quenching method, etc., and these methods have more or less their own shortcomings; iodometric method is the most traditional method, but there is a need A large number of samples, time-consuming, complicated operation, inaccurate judgment of the end point during the titration process, cumbersome preparation and calibration of sodium thiosulfate, etc.; oxygen electrode method requires frequent replacement of electrolyte and gas-permeable membrane, and regular maintenance; fluorescence quenching Extinguishing detection devices are too expensive, limiting their use

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  • A Dissolved Oxygen Detection Method Based on Optical Microfluidic Laser
  • A Dissolved Oxygen Detection Method Based on Optical Microfluidic Laser
  • A Dissolved Oxygen Detection Method Based on Optical Microfluidic Laser

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Embodiment 1

[0029] This embodiment provides a method for detecting dissolved oxygen based on optical microfluidic laser. The detection method is implemented based on a laser light intensity detection device. The laser light intensity detection device is as follows: figure 1 As shown, the pulsed laser is used to provide pump light, the pump light passes through two reflectors to improve the optical path, then expands the beam through two beam expanders, and then undergoes fixed attenuation to reduce the pump energy, and then passes through beam splitting After changing the optical path through the mirror and aperture diaphragm, the pump energy is reduced again through fixed attenuation and adjustable attenuation, and then the beam is converged to one point through the converging lens, and then enters the Fapp cavity after passing through the mirror, and the spectrometer passes through the probe Detect the spectrum of the output laser from the Fab cavity, and the spectrum is calculated by th...

Embodiment 2

[0047] This embodiment provides a method for detecting dissolved oxygen based on an optical microfluidic laser. The difference from Embodiment 1 is that this embodiment provides a variety of reaction reagents for dissolved oxygen concentrations of 0 mg / L, 5 mg / L, and 10 mg / L. , the standard dissolved oxygen solution of 15mg / L is calibrated; Among the various reaction reagents, the concentration of rhodamine B is 0.08mM, 0.12mM, 0.16mM, 0.20mM, 0.24mM successively, and the concentration of sodium tripolyphosphate is 2mM , the concentration of ferrous ammonium sulfate is 4mM.

[0048] Finally, the dissolved oxygen calibration curve is obtained as image 3 As shown, it can be seen from the figure that when the concentration of rhodamine B in the reaction reagent is 0.08-0.24mM, the sensing of dissolved oxygen concentration can be realized. Among them, when the concentration of rhodamine B is 0.08mM, the sensitivity is the highest, which is 0.12mM and 0.16mM , The sensing dynamic...

Embodiment 3

[0050] This embodiment provides a method for detecting dissolved oxygen based on an optical microfluidic laser. The difference from Embodiment 1 is that this embodiment provides a variety of reaction reagents for dissolved oxygen concentrations of 0 mg / L, 5 mg / L, and 10 mg / L. , 15mg / L, the standard dissolved oxygen solution of 20mg / L is calibrated; Among described multiple reaction reagents, the concentration of rhodamine B is 0.16mM, the concentration of sodium tripolyphosphate is 2mM, and the concentration of ammonium ferrous sulfate is successively 0mM, 1mM, 2mM, 3mM, 4mM, 5mM.

[0051] Finally, the dissolved oxygen calibration curve is obtained as Figure 4 As shown, it can be seen from the figure that when the concentration of ferrous ammonium sulfate in the reaction reagent is 1-5mM, the sensing of dissolved oxygen concentration can be realized, and 4mM is the optimal concentration.

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Abstract

The invention belongs to the field of sensing technology, and provides a method for detecting dissolved oxygen based on optical microfluidic lasers. Ferrous ammonium sulfate is used to provide ferrous ions, sodium tripolyphosphate is used as a catalyst, and rhodamine B is used to prepare a reaction reagent. After the reaction reagent and the solution to be tested are reacted, the integrated light intensity is measured by the laser light intensity detection device, and the dissolved oxygen concentration of the solution to be tested is obtained by bringing the integrated light intensity into the dissolved oxygen calibration curve. The invention overcomes many problems existing in the existing iodometric method, the oxygen electrode method and the fluorescence quenching method, realizes the dissolved oxygen concentration detection based on the laser light intensity detection device, has simple operation, low cost, and the reaction reagent is pollution-free and consumes less , and also has the advantages of high detection accuracy and high reliability of detection results.

Description

technical field [0001] The invention belongs to the field of sensing technology, and specifically provides a method for detecting dissolved oxygen based on an optical microflow laser. Background technique [0002] The content of dissolved oxygen is an important control index to measure the self-purification ability of water body and evaluate the state of water body; it is of great significance to environmental protection, aquaculture, industrial production and scientific research experiments. [0003] At present, the existing detection methods for dissolved oxygen include iodometric method, oxygen electrode method, and fluorescence quenching method, etc., and these methods have more or less their own shortcomings; iodometric method is the most traditional method, but there is a need A large number of samples, time-consuming, complicated operation, inaccurate judgment of the end point during the titration process, cumbersome preparation and calibration of sodium thiosulfate, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/63G01N31/10
CPCG01N21/63G01N31/10
Inventor 张霄鹏龚元滕顺杨熙王艳琼
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA