Method of sampling greenhouse gas by utilizing gas balance bag

A greenhouse gas and balance bag technology, applied in sampling devices, measuring devices, instruments, etc., can solve the problems of gas pressure imbalance, acceleration, and slowdown of greenhouse gas emission rate, etc., to achieve easy implementation, reduce measurement errors, and simple operation. Effect

Inactive Publication Date: 2005-01-12
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

At the moment when about 200ml of gas is extracted with a special gas collection bottle or syringe, the soil will abnormally discharge CH into the box because the air pressure outside the box is greater than the air pressure inside the box. 4 gas, and cannot truly reflect the gas emission rate of the soil
[0006] The root cause of the above errors is that the gas pressure inside and outside the sampling box is unbalanced, which makes the soil or plants accelerate (or slow down) the emission rate of greenhouse gases, resulting in the measurement error of soil or plant greenhouse gas emission flux

Method used

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  • Method of sampling greenhouse gas by utilizing gas balance bag

Examples

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Embodiment

[0019] Example: Flux measurement of greenhouse gases produced by soil during sewage land treatment

[0020] 1. Make a sampling box with a gas balance bag

[0021] Use 5mm thick plexiglass to make a box structure of 300×300×400mm, with a gas pipe on the top, open a small hole of about 8mm in the box wall, put a plastic bag (size: 50×100mm, film Thickness: 1.0mm) the opening end protrudes from the inside of the box to the outside of the box, and then the film at the opening end of the plastic bag is fixed on the box wall at the opening of the closed box with an adhesive to keep the gas in the plastic bag passing through the opening and the atmosphere connected;

[0022] 2. Before the closed box covers the soil for sewage treatment, use a blower to fill the plastic bag in the box with air through the opening on the closed box, so that the plastic bag can expand to about two-thirds of its volume;

[0023] 3. Put the above closed box cover on the soil to be measured, and insert t...

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Abstract

A gas balance bag is put into a closed box in use for measuring gas flux discharged by soil or plants. An amount of air is filled into the gas balance bag from small hole in the closed box, making the gas balance bag expand so as to take up certain volume in the closed box. Then, extracting gas measuring and calculating processed result are carried out according to traditional method suitable to closed box. The gas balance bag adjusts consistent air pressure between inside box and outside box. Comparing with measuring in site or in lab, the invention measures gas flux discharged by soil or plants accurately and reduces error.

Description

technical field [0001] The invention relates to a method for sampling greenhouse gases by using a gas balance bag, in particular to a method for measuring the flux of greenhouse gases emitted by soil or plants. It belongs to the technical field of gas sampling. Background technique [0002] Global warming is one of the current global research hotspots. The N produced by human activities 2 O, CH 4 Greenhouse gases such as greenhouse gases are increasing year by year, which is an important factor leading to the global warming effect. According to the report of the Intergovernmental Panel on Climate Change (IPCC), in human activities, N produced by agricultural production and sewage treatment processes 2 O, CH 4 Other greenhouse gases accounted for 19%. In the past 10 years, the flux measurement of greenhouse gases produced by agricultural cultivation, grasslands, wetlands, and sewage treatment has become a hotspot in the study of greenhouse gases, and there have been a la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/22G01N5/00
Inventor 胡湛波严立孔海南
Owner SHANGHAI JIAO TONG UNIV
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