Device and method for measuring soil gaseous nitrous acid emission flux

A technology of gaseous nitrous acid and measuring devices, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of low measured concentration and underestimation of HONO gas emission flux, etc.

Active Publication Date: 2020-12-01
EAST CHINA NORMAL UNIV
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Problems solved by technology

The traditional static box method to measure gas emission flux is to measure the accumulation rate of gas in a closed box for a period of time. However, HONO will decompose on the material surface of the existing dynamic box system, resulting in a low measured concentration. Therefore, Traditional methods will greatly underestimate HONO gas emission fluxes

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  • Device and method for measuring soil gaseous nitrous acid emission flux
  • Device and method for measuring soil gaseous nitrous acid emission flux
  • Device and method for measuring soil gaseous nitrous acid emission flux

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Embodiment 1

[0036] The measuring device of the present invention is placed in a constant temperature incubator at 25° C. to measure the emission flux of soil HONO. During the measurement, connect the air inlet with purified zero air, the air inlet flow rate is 6L / min, connect the air outlet with a nitrogen oxide analyzer, and measure the NOx gas concentration in the device during the experiment. Connect the gas sampler (connected externally with high performance liquid chromatography) directly to high performance liquid chromatography, convert the HONO gas absorbed by the gas sampler into azo compounds, use high performance liquid chromatography to measure the concentration of azo compounds, and then calculate the atmospheric The concentration of HONO in .

[0037] During a dry-wet cycle, soil HONO, NO and NO 2 The variation of discharge flux with water content is shown in the attached image 3 shown. attached by image 3 It can be seen that soil HONO, NO and NO 2 The gas emission fl...

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Abstract

The invention belongs to the technical field of geographical environment, and particularly relates to a measuring device of the emission flux of soil nitrous acid (HONO). The measuring device comprises a main body frame, an upper cover arranged at the top of the main body frame, a lower cover arranged at the bottom of the main body frame, a gas inlet pipe, a gas outlet pipe, a diffusion pipe arranged in the main body frame and connected with the gas inlet pipe and a fan arranged in the main body frame, wherein the gas inlet pipe and the gas outlet pipe extend into the main body frame through the upper cover; the surfaces of the upper cover, the lower cover and the fan are coated with Teflon thin films; the side wall of the main body frame is a Teflon thin film; the gas inlet pipe, the gasoutlet pipe and the diffusion pipe are Teflon gas pipes; wall losses of active nitrogen gas such as HONO in the measuring process can be avoided, the measuring device can simulate the emission flux ofsoil HONO in a complete dry-wet alternation cycle, and compared with an existing measuring method, precision quantification of the emission flux of soil HONO can be realized.

Description

technical field [0001] The invention relates to the technical field of geographical environment, in particular to a device and method for measuring soil gaseous nitrous acid emission flux. Background technique [0002] Terrestrial ecosystems can emit greenhouse gases (CO 2 、CH 4 and N 2 O), active nitrogen gas (HONO, NO, NO 2 and NH 3 etc.) and volatile organic compounds (VOCs), etc., can also absorb these gases from the atmosphere. Gas exchange at the interface between the land and the atmosphere can significantly affect the composition of the Earth's atmosphere, human health, and the evolution of life. [0003] Reactive nitrogen gas, such as gaseous nitrous acid (HONO), has strong chemical activity, short atmospheric lifetime (0.5-2 hours), and strong adsorption. The emission flux of gaseous nitrous acid is affected by environmental conditions such as atmospheric concentration, temperature, humidity, and light. The traditional static box method to measure gas emissi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/00G01N30/02
Inventor 吴电明刘敏王梦迪刘彦卓
Owner EAST CHINA NORMAL UNIV
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