voc collection device, voc collection method

Abstract

The invention provides a VOC collecting device and VOC collecting method for collecting VOCs released by soil and ground cover plants thereof. The VOC collecting device comprises a gas collecting chamber; a VOC collecting pipe, wherein the inlet of the VOC collecting pipe is connected with the gas outlet valve of the gas collecting chamber via a pipeline; a first valve, which is used for controlling the opening and closing of the inlet of the VOC collecting pipe; a gas circuit pipe, wherein the inlet of the gas circuit pipe is connected with the gas outlet valve of the gas collecting chamber through a pipeline; a second valve, which is used for controlling the opening and closing of the inlet of the gas circuit pipe; a gas pump, which has a pump inlet and a pump outlet, wherein the pump inlet is connected with the outlet of the VOC collecting pipe and the outlet of the gas circuit pipe through pipelines; and a dryer and a filter, successively arranged between and connected with the pump outlet and the gas inlet valve of the gas collecting chamber. With such a technical scheme, the VOC collecting device can conveniently collect VOCs released by soil in a specific area and ground cover plants thereof in the field, eliminates the interference of VOCs contained in background samples, and is capable of carrying out dehumidification in different manners according to the humidity situation in a gas chamber.

Description

technical field [0001] The invention relates to the technical field of gas collection, in particular to a VOC collection device and a VOC collection method. Background technique [0002] People will be exposed to a large amount of VOC (volatile organic compound) when they are active in the natural environment. Its main components are some organic chemicals released by plant leaves, litter, etc., which are usually divided into isoprene, Monoterpene (monoterpene) and other VOCs (including hydrocarbons, alcohols, aldehydes, ketones, esters, organic acids, and some nitrogen-containing compounds, etc.) Antibacterial, clean air, etc., can relieve fatigue and improve the physiological and psychological state of the human body, while the oxidation products of isoprene and VOC are closely related to global climate change. [0003] The study of VOC release from soil and ground cover plants is of great significance to the development of forest health resources, the assessment of soil ...

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Problems solved by technology

[0003] The study of VOC release from soil and ground cover plants is of great significance to the development of forest health resources, the assessment of soil VOC pollution restoration, the improvement of plant-source greenhouse gas emission models, and the formation mechanism of secondary organic aerosol transformation in the atmosphere. However, the current VOC sampling method And the device is mostly used for sampling the VOC released from the branches of trees and shrubs. It is impossible to perform specific sampling of the VOC released by the ground cover grass, short shrubs and soil. The equipment converted from the traditional static box generally suffers from serious water vapor accumulation, volatilization pollution and adsorption residue of the device itself. and other problems seriously affect the accuracy of sample collection and subsequent analysis

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