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Real-time monitoring method for oxygen in fruit and vegetable storage environment

A real-time monitoring and ambient gas technology, applied in measuring devices, material analysis through electromagnetic means, instruments, etc., can solve the problems of inconvenient portability, on-site detection, and low detection speed

Inactive Publication Date: 2019-03-15
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the determination methods of oxygen content mainly include chemical capacity method, magnetic oxygen analysis method, zirconia concentration cell method, electrochemical method, gas chromatography, etc. These methods have their own characteristics and limitations, such as the most widely used Although the zirconia concentration cell method has a short response time and a wide measurement range, it must be used at high temperature without the presence of reducing impurity gases. Although gas chromatography has high sensitivity and strong anti-interference ability, its detection speed is low. , not easy to carry and on-site detection, therefore, it is of great significance to develop a new real-time oxygen monitoring method

Method used

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  • Real-time monitoring method for oxygen in fruit and vegetable storage environment
  • Real-time monitoring method for oxygen in fruit and vegetable storage environment

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Embodiment 1

[0017] The detection conditions of ion mobility spectrometry: the working voltage is 240 V / cm, the transfer tube temperature is 100°C, compressed air is used as the ambient gas sample, the flow rate is 40ml / min, the diluent gas flow rate is 460 ml / min, and the makeup gas flow rate is 500 ml / min , the dilution gas and makeup gas are all high-purity nitrogen treated with silica gel, activated carbon and molecular sieves, and the water vapor content is less than 10 ppm, such as figure 2 As shown in the measured ion mobility spectrum, oxygen can react with electrons to form a characteristic product ion with a migration time of 9.43 ms under the condition of high-purity nitrogen.

Embodiment 2

[0019] The detection conditions of ion mobility spectrometry: the working voltage is 240 V / cm, the transfer tube temperature is 100°C, compressed air is used as the ambient gas sample, and the flow rate of the ambient gas and the diluent gas is combined at 500 ml / min. By adjusting the flow rate ratio of the ambient gas and the diluent gas , to obtain oxygen samples with different concentrations, the makeup gas flow rate is 500 ml / min, the dilution gas and makeup gas are all high-purity nitrogen treated with silica gel, activated carbon and molecular sieves, and the water vapor content is less than 10 ppm; The signal intensity of the oxygen characteristic peak in the migration spectrum is plotted against the oxygen concentration, and the following is obtained: image 3 As shown in the oxygen response curve, it can be seen from the figure that with the increase of the oxygen concentration in the sample gas, the intensity of the characteristic peak of oxygen increases gradually. W...

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Abstract

The invention discloses a real-time monitoring method for oxygen in fruit and vegetable storage environment. According to the method, moisture in ambient gas is removed by a dehumidifying device; thedehumidified ambient gas and a certain flow of inert gas are collected and diluted by an automatic gas sampling and online dilution device to enter an ion migration spectrum ionization zone; electronsformed by oxygen molecules in the ionization zone and the inert gas react to form characteristic oxygen product ions; the product ions enter a migration zone through a pulse-open ion gate, and are separated in the migration zone according to different migration rates; the product ions reaches a Faraday plate to be detected, and are finally received and detected by a signal receiving and detectingsystem to form an ion migration spectrogram; and signal response of characteristic peaks of the oxygen molecules is monitored to realize real-time monitoring of the oxygen concentration in the environment of fruit and vegetable atmosphere. The real-time monitoring method for oxygen in fruit and vegetable storage environment is high in detection speed and high in detection sensitivity.

Description

technical field [0001] The invention relates to a real-time monitoring method for oxygen in a fruit and vegetable storage environment. Background technique [0002] Controlled atmosphere storage refers to the refrigeration method in a specific gas environment. After fresh fruits and vegetables are picked, they are still undergoing vigorous respiration and evaporation, absorbing oxygen from the air, decomposing and consuming their own nutrients, and producing carbon dioxide and water. and heat, because the respiration consumes the nutrients of fruits and vegetables after picking, so the key to prolonging the storage period of fruits and vegetables is to reduce the respiration rate. The change of gas composition in the storage environment has a significant impact on the physiology of fruits and vegetables after picking. Low oxygen content can effectively Inhibit respiration, reduce evaporation to a certain extent, and inhibit microbial growth to achieve the purpose of delaying...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62
CPCG01N27/622
Inventor 程沙沙杨慧敏谭明乾李然然王小荟
Owner DALIAN POLYTECHNIC UNIVERSITY
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