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Device and method for measuring flux of volatile organic compounds of plant canopy

A volatile organic, flux measurement technology, applied in the direction of measuring devices, sampling devices, testing plants/trees, etc., can solve the problems that the measurement sensitivity cannot meet the measurement requirements, high operation and maintenance requirements, expensive instruments, etc., to achieve cost Low cost, easy installation and simple operation

Pending Publication Date: 2020-02-04
INST OF ATMOSPHERIC PHYSICS CHINESE ACADEMY SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Currently commonly used measuring instruments include GC / MS (gas chromatography-mass spectrometer), PTR-MS (proton transfer reaction mass spectrometer), among which the measurement sensitivity of GC / MS cannot meet the measurement requirements, although PTR-MS can meet the requirements , but the price of the instrument is too expensive, the operation and maintenance requirements are high, and the calibration is too complicated

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  • Device and method for measuring flux of volatile organic compounds of plant canopy
  • Device and method for measuring flux of volatile organic compounds of plant canopy
  • Device and method for measuring flux of volatile organic compounds of plant canopy

Examples

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Embodiment 1

[0021] as attached figure 1 As shown, a plant canopy volatile organic substance flux measurement device includes a three-dimensional ultrasonic anemometer, a data acquisition system and a BVOCs sampling system. The three-dimensional ultrasonic anemometer is used to judge the wind direction and measure the wind speed, and is collected by the data The system gives control instructions according to the wind direction and wind speed, and controls the BVOCs sampling system to collect BVOCs samples. After the BVOCs samples are collected, they are sent back to the laboratory to analyze the sample concentration, and finally calculate the flux of BVOCs.

[0022] as attached figure 2 As shown, the BVOCs sampling system includes a three-way solenoid valve, and the three-way solenoid valve is respectively connected to the zero gas circuit, the upper adsorption line and the lower adsorption line, the upper adsorption line includes the upper adsorption tube, and the upper adsorption An up...

Embodiment 2

[0028] This embodiment provides a method for measuring the flux of volatile organic substances in the plant canopy as shown in the attached Figure 3-6 shown, including the following steps:

[0029] A. Determine the wind direction by the three-dimensional ultrasonic anemometer; the data acquisition system gives control instructions according to the wind direction and wind speed, and controls the BVOCs sampling system to collect BVOCs samples. The BVOCs samples are respectively collected by the upper adsorption tube and the lower adsorption tube of the BVOCs sampling system ;

[0030] B. After the BVOCs sample is collected, send it back to the laboratory to analyze the sample concentration, and finally calculate the flux of BVOCs. The formula for calculating the flux is:

[0031] f i =bσ w (C up -C down )

[0032] Among them, σw is the standard deviation of vertical wind speed, which is given by the three-dimensional ultrasonic anemometer, b is the empirical coefficient, ...

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Abstract

The invention relates to the technical field of atmospheric volatile organic compound flux measurement, and particularly relates to a device and method for measuring flux of volatile organic compoundsof a plant canopy. The device comprises a three-dimensional ultrasonic anemometer, a data acquisition system and a BVOCs sampling system, and is characterized in that the three-dimensional ultrasonicanemometer is used for judging the wind direction and measuring the wind speed, wherein the data acquisition system gives a control instruction according to the wind direction and the wind speed; theBVOCs sampling system is controlled to collect a BVOCs sample; the BVOCs sample is sent back to a laboratory for analyzing the concentration of the sample after being collected; and finally the fluxof the BVOCs is calculated. The flux of the BVOCs is measured by adopting a relaxation vortex accumulation method, the device is simple to operate and is conveniently mounted on an observation tower,BVOCs components in the horizontal direction of the fixed height are collected by utilizing an adsorption tube, the concentration of the components in the horizontal direction of the BVOCs is analyzedand quantified through the laboratory, the flux of the BVOCs is calculated, and the method is accurate in measurement, low in cost and capable of being used for long-term continuous observation.

Description

technical field [0001] The invention relates to the technical field of atmospheric volatile organic matter flux measurement, in particular to a plant canopy volatile organic matter flux measurement device and method. Background technique [0002] Plant volatile organic compounds (Biogenic Volatile Organic Compounds, BVOCs) are the main components of volatile organic compounds (VOCs) in the atmosphere. In terms of emissions, BVOCs emissions account for more than 90% of VOCs emissions, and most BVOCs have It is highly active and participates in atmospheric photochemical reactions. It is one of the key precursors of ozone and secondary organic aerosols (SOA), which can affect the atmospheric environment and climate. Therefore, how to effectively and accurately measure the flux of BVOCs is an urgent need for BVOCs research. [0003] The existing BVOCs emission observation methods are mainly laboratory analysis methods, which estimate the emission rate of plants by measuring the...

Claims

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Application Information

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IPC IPC(8): G01N33/00G01N1/22
CPCG01N1/2214G01N33/0098
Inventor 吴方堃胡波辛金元赵佳孙杰
Owner INST OF ATMOSPHERIC PHYSICS CHINESE ACADEMY SCI
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