Device for collecting gas released from water body and sampling method thereof

Abstract

The invention, which belongs to the resource and environment technology field, relates to a gathering device for gas released by a water body and a sampling method thereof. The device comprises a floating ball support; a semisphere cylinder gas collection tank is suspended on the floating ball support; a gas outlet is arranged at the top of the tank and a valve is installed; a gas collector is suspended at the top of the support; and an air intake of the gas collector is connected with the gas outlet of the semisphere cylinder gas collection tank and a drain pipe is directly dipped into water. When gas is collected, the device is placed on a sampling point of a water surface; when the valve is opened, the semisphere cylinder gas collection tank is completely immersed into water and gases in the gas collection tank are completely discharged; and gases that are produced by a water body that is below the gas collection tank and is covered by the gas collection tank is gathered along an inner wall of the gas collection tank towards the top of the gas collection tank. According to dewatering and gas collection principles, water in the gas collector is discharged and to-be-measured gases that are released by the water body enter the gas collector, so that a purpose that real-time and automatic collection is carried out on gases released by a water body can be realized. According to the invention, a problem that research work is lacked of applicative closed gas collection equipment can be effectively solved, wherein the research work includes researches on production of gases released by different water bodies, releasing laws and gas components.

Description

technical field [0001] The invention belongs to the technical field of resources and environment, and relates to a water body release gas collection device and a sampling method thereof. Background technique [0002] Eutrophic water is generally considered to be an important source of greenhouse gas release, such as: CO 2 、CH 4 , N 2 O. In the context of the current eutrophication of water bodies and global warming, people are paying more and more attention to changes in the intensity of greenhouse gas release in water bodies. In addition, the nitrification-denitrification reaction in eutrophic water body is one of the important ways to denitrify the water body, and the intermediate gaseous product of nitrification-denitrification reaction, N 2 O and the final gaseous product N 2 The release has also received more attention. However, for a long time, there has been a lack of an effective water release gas collection device, making the research progress in this area rel...

AI Technical Summary

Problems solved by technology

However, for a long time, there has been a lack of an effective water body release gas collection device, making the research progress in this area relatively slow

[0003] The method currently used is mainly the static box method, which directly uses a sealed inverted box for sampling. When sampling, the base needs to be fixed in the sediment at the sampling point, which is very inconvenient to implement, and the sampler of this method is in the sampling process. There is no connection with the outside world, so there must be a negative pressure phenomenon, resulting in accelerated volatilization of the gas, which makes the sampling results inaccurate

There is also a collection device for volatile gases on water bodies and soil surfaces. It is a dynamic box method. During sampling, the box body is fixed (inverted without a cover), and the gas is input into the dynamic collection box with a gas storage bottle equipped with nitrogen. With nitrogen as the flow carrier, after the dynamic equilibrium is reached, that is, when the original gas in the box is driven away by the carrier gas, the gas sample is collected. The main defect of this method is that it is only suitable for the target gas with a large amount of volatilization and a fast volatilization speed. The collection of non-nitrogen gases in the environment, and the release of gas from the water body to the atmospheric interface is a relatively slow process, and the target gas collected is CH 4 , N 2 O, N 2 etc. Therefore, it is of great practical value to develop new and more accurate and effective sampling equipment and sampling methods

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