A method of measuring an oxygen atom concentration by utilizing a titration technology

A technology of technical measurement, oxygen atom, applied in material excitation analysis, fluorescence/phosphorescence, etc., can solve problems such as complex application

Active Publication Date: 2016-06-22
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Description
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Problems solved by technology

This method is widely used at present, and its disadvantage is that calibration coefficient κ needs to be calibrated in advance, and the calibration coefficient κ is not only related to the wavelength, but also changes with the temperature T in the cavity, so the application is more complicated

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  • A method of measuring an oxygen atom concentration by utilizing a titration technology
  • A method of measuring an oxygen atom concentration by utilizing a titration technology
  • A method of measuring an oxygen atom concentration by utilizing a titration technology

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Embodiment 1

[0046] A method of measuring the atomic concentration of oxygen using titration techniques.

[0047] In this embodiment, nitric oxide is used as a fluorescent indicator (nitric oxide and oxygen atoms undergo a three-body recombination reaction to produce excited state molecules of nitrogen dioxide, and the excited state molecules emit broad-band fluorescence when they spontaneously radiate), and iodine molecules are used as titration indicators. The iodine molecule reacts rapidly with the oxygen atom. When the oxygen atom is just consumed by the iodine molecule, the fluorescence of the nitrogen dioxide molecule will be extinguished. During the titration, the extinction of the fluorescence of the nitrogen dioxide molecule will be taken as the end point of the titration.

[0048] The specific operation steps are as follows:

[0049] (1) Pass oxygen through a glass discharge tube with an initial flow rate of 310 SCCM (SCCM means standard milliliters per minute), and use a dielect...

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Abstract

A method of measuring an oxygen atom concentration by utilizing a titration technology is provided. The method adopts nitric oxide as a fluorescent indicator, wherein the nitric oxide and an oxygen atom are subjected to a three-body recombination reaction to generate a nitrogen dioxide excited state molecule, and the excited state molecule emits wide-spectrum fluorescence during spontaneous radiation. The method adopts iodine molecules or mercury atoms, and the like as a titrant. The titrant rapidly reacts with oxygen atoms, the nitrogen dioxide molecule fluorescence quenches when the oxygen atoms are completely consumed through the titrant, and quenching of the nitrogen dioxide molecule fluorescence during titration is adopted as a titration end point. The method only needs to measure the concentration of the titrant, can determine the titration end point by observing the fluorescence of the indicator through naked eyes, and is advantaged by being simple, direct, rapid and convenient.

Description

technical field [0001] The invention belongs to the detection field of oxygen atoms, and in particular relates to a method for measuring the concentration of oxygen atoms, which is suitable for electrically excited oxygen-iodine lasers. Background technique [0002] The first chemical laser operating between electronic states was the oxygen iodine chemical laser, the basic principle of which is: [0003] metastable particle O 2 ( 1 Δ) Generation: [0004] Cl 2 +2KOH+H 2 o 2 →O 2 ( 1 Δ)+2KCl+2H 2 o [0005] Dissociation of iodine molecules (approximately consuming 4-6 singlet oxygen molecules): [0006] I 2 +nO 2 ( 1 Δ)→2I+nO 2 ( 3 Σ)n=4-6 [0007] metastable particle O 2 ( 1 Δ) Near resonance energy transfer with iodine atom: [0008] [0009] Laser emission: I( 2 P 1 / 2 )+hν→I( 2 P 3 / 2 )+2hν(λ=1.315μm) [0010] In a conventional chemical oxygen-iodine laser, the metastable energy-storing particle O 2 ( 1 Δ) when using toxic and explosive Cl 2 、H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
Inventor 李留成多丽萍金玉奇唐书凯李国富王元虎于海军汪健曹靖康元福
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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