Weak acid and weak alkali concentration measurement method based on laser-induced fluorescein sodium fluorescence

A sodium fluorescein and laser-induced technology, which is applied in the field of chemical detection, can solve the problems of not being able to reflect the diffusion state of the substance to be measured in real time, and achieve the effects of saving measurement time, high spatial resolution, and improved resolution

Pending Publication Date: 2021-10-08
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0008] Aiming at the problem that the above weak acid concentration measurement method cannot reflect the diffusion state of the substance to be measured in real time, the present invention provides a method for measuring the concentration of weak acid and weak base based on laser-induced fluorescence of sodium fluorescein

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  • Weak acid and weak alkali concentration measurement method based on laser-induced fluorescein sodium fluorescence
  • Weak acid and weak alkali concentration measurement method based on laser-induced fluorescein sodium fluorescence
  • Weak acid and weak alkali concentration measurement method based on laser-induced fluorescein sodium fluorescence

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Embodiment 1

[0039] The present invention includes a laser measuring device such as figure 1 As shown, it includes a flow channel pipeline 1, a laser 2, a synchronization device 4, a photographing device 3, and a computer 5; wherein the photographing device 3 and the laser device 2 are located at different angles outside the flow channel pipeline 1; the laser 2 and the photographing device 3 are connected together To the synchronization device 4 , which is connected to a computer 5 .

[0040] Measure the concentration profile of boric acid in a T-tube. Due to the need for optical measurement methods, the pipe is made of acrylic (refractive index about 1.55) material with good light transmission, and a square optical compensation layer is provided at the round pipe. Runner circular test section such as figure 2 , The inner diameter of the single-tube axial test body is 70mm, the length is 1000mm, and the concentration range of boric acid studied is 0-2000ppm.

[0041] The process of the...

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Abstract

The invention relates to a weak acid and weak alkali concentration measurement method based on laser-induced fluorescein sodium fluorescence. The method is used for measuring the concentration of weak acid and weak alkali in a transparent flow channel according to a measurement principle that the concentration of weak acid and weak alkali is measured by utilizing different fluorescence properties of fluorescein sodium under different pH values. Devices required for measurement comprise a laser device, a synchronizer, shooting equipment and a signal acquisition and processing device, wherein the laser device is used for generating laser capable of enabling fluorescein sodium to emit fluorescence, the fluorescence is measured, and the synchronizer is used for synchronizing the operation of the shooting equipment and the laser device. According to the invention, real-time measurement of the weak acid and weak alkali concentration is achieved, ie., the distribution condition of the to-be-measured concentration can be obtained in real time; and compared with a traditional concentration measurement method, the transient concentration change condition can be obtained, and the measurement time is obviously saved, so that the method can be used for concentration control in the field more sensitive to the concentration, and after a corresponding post-treatment system is connected, the influence of the acid concentration on the subsequent process can be analyzed in real time.

Description

technical field [0001] The invention belongs to the technical field of chemical detection, in particular to a method for measuring the concentration of weak acids and bases based on laser-induced fluorescence of sodium fluorescein. Background technique [0002] Weak acid solution concentration measurement technology has been applied in many fields, such as environmental pollution detection in factories, industrial processes of food and medicine, intermediate detection of chemical production, etc. As the detection requirements are getting higher and higher, the existing detection technology is difficult to achieve non-contact measurement, real-time measurement and high spatial resolution measurement. In addition, in the field of chemical industry and nuclear science, more accurate and detailed measurement methods are needed for the information on the concentration distribution of weak acids to improve the design of equipment and pipelines. [0003] At present, the methods fo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
CPCG01N21/6402
Inventor 王德忠周文涛张新煜董冰宋煜晨杨桧
Owner SHANGHAI JIAO TONG UNIV
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