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A device and method for rapidly detecting total volatile organic compounds

An organic compound and volatile technology, which is applied in the field of rapid detection of total volatile organic compounds, can solve the problems of limited compound types and inability to meet TVOC detection requirements, and achieve the effect of simple structure, fast detection and improved sensitivity

Active Publication Date: 2020-12-01
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the past, catalytic luminescence sensors usually used oxygen (weak oxidant) in the air as the oxidant, and catalysts that had a specific response to a certain compound or a certain type of compound were used as the sensing element to achieve the detection of a certain compound or a certain type of compound. The types of compounds are limited and cannot meet the requirements of TVOC detection

Method used

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  • A device and method for rapidly detecting total volatile organic compounds
  • A device and method for rapidly detecting total volatile organic compounds
  • A device and method for rapidly detecting total volatile organic compounds

Examples

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Embodiment 1

[0059] In this example, different types of organic compounds were selected to verify the sensitivity enhancement effect of the device of the present invention on catalytic luminescence detection of organic compounds.

[0060] A total of 8 categories and a total of 33 organic compounds were investigated as research objects, including: benzene series, alcohol compounds, alkane compounds, aldehyde compounds, ketone compounds, olefin compounds, ester compounds, halogenated Catalytic luminescence signals of hydrocarbon compounds under four reaction conditions. The steps are as follows: take about 0.2g of titanium dioxide nanomaterials, add deionized water, stir evenly to form a suspension, and apply it evenly on the heating element. Put the heating element in the quartz glass tube, after the seal is complete, turn on the temperature controller, adjust its heating voltage, and adjust the surface temperature of the heating element to 205±5°C. Then, the catalytic luminescent signal w...

Embodiment 2

[0067] Volatile organic compounds cover a wide range and complex types, and it is difficult to identify all compounds one by one. Therefore, the response coefficient of toluene is commonly used to calculate the concentration of unidentified compounds. Therefore, the establishment of a detection method for toluene is very important for TVOC detection. In this embodiment, toluene is used as the target object, and a method for rapid detection of toluene is established based on the device of the present invention and the conditions are optimized.

[0068] i. Reaction temperature optimization

[0069] Take about 0.2g of titanium dioxide nanomaterials, add deionized water, stir evenly to form a suspension, and evenly smear it on the heating element of the heating element, and then place the heating element in the quartz glass tube. After the seal is complete, adjust it through the temperature controller. its surface temperature. The configuration concentration is 250mg / m 3 Toluene...

Embodiment 3

[0077] Since the device of the present invention can significantly enhance the catalytic luminescence signals of different types of organic compounds, that is, it can generate signal responses to different types of organic compounds, so it can be used in conjunction with a chromatographic separation device as a new type of chromatographic light detection for TVOC detection device. The device of the present invention is connected with a 1.5-meter polar gas chromatography packed column, and nitrogen is used as a carrier gas. Under the condition of a carrier gas pressure of 0.2mPa, it is used for methanol, ethanol, n-propanol, ethyl acetate; n-butanol, Ethyl butyrate, butyl acetate, the analytical separation of ethyl hexanoate mixture, can be used as the application value of novel chromatographic photodetector to verify device of the present invention, the result is as follows Figure 8 shown. Figure 8 Show that these 8 kinds of organic compounds can be detected one by one by t...

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Abstract

The invention relates to a device for rapid detection of total volatile organic compounds. The device comprises a plasma generator, an ozone generator and a catalytic luminescence sensing device, wherein the plasma generator is provided with a sample gas inlet and a sample gas outlet. The ozone generator is provided with an ozone outlet. The catalytic luminescence sensing device includes a chemiluminescent reaction chamber with a catalyst inside and a photodetector. The sample gas inlet and the ozone outlet are respectively communicated with the chemiluminescent reaction chamber, respectively.The photodetector detects a catalytic luminescence signal emitted from the chemiluminescent reaction chamber. The invention also relates to a method for rapid detection of the total volatile organiccompounds. The device for rapid detection of the total volatile organic compounds can meet the requirements of rapid, sensitive and simple detection of the TVOC (total volatile organic compounds).

Description

technical field [0001] The invention relates to the technical field of chemical detection and analysis, in particular to a device and method for rapidly detecting total volatile organic compounds. Background technique [0002] Volatile organic pollutants (VOC) refer to organic compounds with a saturated vapor pressure exceeding 70.9Pa or a boiling point less than 260°C at room temperature. Total volatile organic compounds (TVOC) are the sum of various volatile organic pollutants, including benzene series, Alkanes, alkenes, halogenated hydrocarbons, esters, ketones, aldehydes and other volatile organic compounds. The outdoor pollution sources of TVOC mainly come from fuel combustion and transportation, and the indoor pollution sources mainly come from building materials such as wood-based panels, plastic panels, foam insulation materials, etc., and decorative materials such as coatings, paints and adhesives. Volatile organic compounds are irritating, teratogenic, carcinogeni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/76
CPCG01N21/766
Inventor 李攻科张润坤黄婉婷胡玉斐
Owner SUN YAT SEN UNIV
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