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Portable vegetation source volatile organic compound sampling system and working method thereof

A volatile organic compound and sampling system technology, which is used in sampling devices, preparation of test samples, instruments, etc., can solve the problems of incomplete collection of components, easily damaged leaves, and inability to control the temperature of leaves.

Active Publication Date: 2020-11-03
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

LI-COR series sampling equipment has the following deficiencies: 1) The collection components are incomplete
The standard leaf chamber of LI-COR series sampling equipment is 6cm 2 (2cm×3cm), the coniferous leaf chamber is 12cm 2 (2cm×6cm), only a part of the blade can be clamped for testing, and the temperature control of the larger complete blade cannot be carried out, and the blade is easily damaged when the wind is strong

Method used

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  • Portable vegetation source volatile organic compound sampling system and working method thereof
  • Portable vegetation source volatile organic compound sampling system and working method thereof
  • Portable vegetation source volatile organic compound sampling system and working method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0074] Such as figure 1 As shown, a portable vegetation source volatile organic compound sampling system, the sampling system includes an air intake unit, a sampling unit, a measurement unit, and an analysis unit;

[0075] The air intake unit includes an air pump a 1, a hydrocarbon trap 2, and a three-way valve a 22 connected in sequence through an air pipeline;

[0076] The sampling unit includes a flow sensor a 3, a glass leaf chamber unit 4, a four-way valve 25, a pipeline connector a 5, a valve a 6, a VOC adsorption column 7, and an air pump b 8, which are sequentially connected through gas pipelines; The flow sensor a3 is connected to the three-way valve a22 of the intake unit; the four-way valve 25 is also connected to the flowmeter 10 through the air pipeline;

[0077] The measuring unit includes an orifice throttling device a 14, a three-way valve b 23, a pipeline connector c 16, a particle filter b 17, a gas analyzer 13, a flow sensor b 18, three Through valve c 24,...

Embodiment 2

[0104] The working method of portable vegetation source volatile organic compound sampling system as described in embodiment 1, comprises steps as follows:

[0105] (1) When in use, use the heating device 43 to control the temperature in the glass leaf chamber 41 at 30°C; adjust the distance between the light-emitting diode (LED) 42 and the top of the glass leaf chamber 41, so that the light intensity received by the blades is controlled to 1000 μmol m -2 the s -1 Through leaf chamber temperature sensor 416, blade temperature sensor 414, and photosynthetically active radiation (PAR) sensor 415, obtain the data such as the temperature of glass leaf chamber 41, blade and the illumination parameters inside glass leaf chamber 41; Ambient air, the flow rate is 1220mL / min;

[0106] (2) The stabilization process of the system

[0107] The flow rate of the gas analyzer 13 is set in advance to be 500mL / min, so that the gas flow rate passing through the gas analyzer 13 is 500mL / min; a...

Embodiment 3

[0119] The working method of the portable vegetation source volatile organic compound sampling system as described in embodiment 1 is as described in embodiment 2, and the difference is: the blade measured in step (2) is as follows: image 3 As shown in (b), the area of ​​the blade is 9.563cm 2 , is measured by Image J software; The CO of ambient air that gas analyzer 13 records in step (4) 2 Concentration CO 2in =378.26 μmol mol -1 , and the CO of the mixed gas 2 The concentration of CO 2out =361.67 μmol mol -1

[0120] After substituting the specific data into the formula, the measured net photosynthetic rate of the leaves is 9.299 μmol m -2 the s -1 .

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Abstract

The invention provides a portable vegetation source volatile organic compound sampling system and a working method thereof. The sampling system comprises an air inlet unit, a measuring unit, a sampling unit and an analyzing unit. The invention also provides a working method of the sampling system. The sampling system has the advantages of being high in accuracy and convenient to carry, can be usedfor collecting volatile organic compounds of various types of tree species such as broad-leaved forests and coniferous forests under standard conditions, can monitor and control illumination intensity, temperature and the like in real time so as to determine the emission flux of the volatile organic compounds, and provides a reliable basis for accurately evaluating the emission of BVOCs.

Description

technical field [0001] The invention relates to a portable vegetation source volatile organic compound sampling system and a working method thereof, belonging to the technical field of environmental monitoring. Background technique [0002] Biogenic volatile organic compounds (BVOCs) account for more than 90% of the total emissions of VOCs in the world, of which terrestrial vegetation is the main source of emissions. There are many kinds of volatile organic compounds from vegetation. For example, there are more than 100 kinds of VOCs released by forests, but only a few kinds are relatively rich in content. Vegetation-derived volatile organic compounds include isoprene, monoterpenes, sesquiterpenes and other BVOCs. Among them, isoprene (C 5 h 8 ) accounted for approximately global BVOC S Half of the total emissions, extremely reactive. The impact of vegetation-derived VOCs on atmospheric chemistry is mainly divided into two aspects. One is O 3 The main precursors genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/24G01N1/34G01N30/06G01N30/88
CPCG01N1/24G01N1/34G01N30/06G01N30/88Y02A50/20
Inventor 张宜升王新雨杜金花韩枝燏
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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