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Preparation method of ratio oxygen sensing film for detecting contents of dissolved oxygen

An oxygen sensing film, oxygen content technology, applied in measurement devices, instruments, analytical materials, etc., can solve the problems of non-recoverable cost, pollution of water samples to be measured, poor resistance to photobleaching, etc., and achieve strong thermal stability and light. The effect of stable, strong selectivity and strong resistance to photobleaching

Active Publication Date: 2019-08-09
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0006] The present invention aims to solve the problems that the existing ratio oxygen sensing method pollutes the water sample to be tested, is not recyclable, causes high cost, and has poor photobleaching resistance, and provides a preparation of a ratio oxygen sensing membrane for dissolved oxygen content detection. method

Method used

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  • Preparation method of ratio oxygen sensing film for detecting contents of dissolved oxygen
  • Preparation method of ratio oxygen sensing film for detecting contents of dissolved oxygen
  • Preparation method of ratio oxygen sensing film for detecting contents of dissolved oxygen

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specific Embodiment approach 1

[0039] Specific Embodiment 1: The preparation method of the ratio oxygen sensing membrane used for the detection of dissolved oxygen content in this embodiment includes the following steps:

[0040] 1. Preparation of copolymer matrix material:

[0041] Mixing styrene and trifluoroethyl methacrylate to obtain a St / TFEMA mixture;

[0042] Disperse the azobisisobutyronitrile solution evenly in the St / TFEMA mixed solution, and then carry out the copolymerization reaction of the mixed solution under the protection of nitrogen. , to obtain a colorless and transparent copolymer solution;

[0043] Use methanol to wash and filter the copolymer solution several times to remove unreacted monomers, and cool it at room temperature for later use;

[0044] 2. Preparation of ratiometric oxygen sensing membrane:

[0045] Platinum octaethylporphyrin (PtOEP) was used as an oxygen-quenching indicator, and coumarin 6 (C6) was used as a reference indicator insensitive to oxygen.

[0046] Dissolve...

specific Embodiment approach 2

[0052] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the volume ratio of styrene and trifluoroethyl methacrylate in Step 1 is (1-4):1. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0053] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the concentration of the azobisisobutyronitrile solution in Step 1 is 0.003-0.025 g / mL. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a preparation method of a ratio oxygen sensing film for detecting the contents of dissolved oxygen, relates to the preparation method of the ratio oxygen sensing film, and aimsat solving the problem that the existing ratio oxygen sensing methods are high in cost and bad in photo-bleaching resistance due to the reason that to-be-tested water samples are polluted and cannotbe recovered. The method comprises the steps of 1, uniformly dispersing azobisisobutyronitrile solution in St / TFEMA mixed solution, copolymerizing the mixed solution under nitrogen protection to obtain copolymer solution, and carrying washing and suction filtration; 2, mixing PtOEP / toluene solution with C6 / toluene solution to obtain mixed indicator solution, re-dissolving the copolymer solution intoluene to obtain copolymer / toluene solution, mixing the copolymer / toluene solution with the mixed indicator solution, applying the obtained mixed solution on a quartz plate, and carrying out dryingto obtain the ratio oxygen sensing film. The ratio oxygen sensing film can be recycled for multiple times, has no pollution to the environment, and has photo-bleaching resistance. The method is used in the field of dissolved oxygen detection.

Description

technical field [0001] The invention relates to a preparation method of a ratio oxygen sensing membrane. Background technique [0002] Dissolved Oxygen (DO) is gaseous molecular oxygen dissolved in water. There are two main sources of it. One is that oxygen in the atmosphere enters the water through osmosis, and the other is that some aquatic plants release oxygen through photosynthesis. The concentration of DO is closely related to atmospheric pressure, partial pressure of oxygen in the air, and water temperature. Generally, when the air pressure is high or the temperature is low, the DO content in the water sample will be higher. The measurement of DO content is of great significance in the fields of environmental monitoring, clinical medicine, aquaculture, food industry, marine science and biochemical industry. In the field of environmental monitoring, the quality of water is directly reflected in the value of DO content. When the water body is polluted by some organic s...

Claims

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Application Information

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IPC IPC(8): G01N21/64C08F212/08C08F220/24
CPCG01N21/643C08F212/08C08F220/24
Inventor 张治国张鸿林刘婷徐明明秦峰
Owner HARBIN INST OF TECH
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