On-line detection method and device for ultralow-concentration ammonia gas content

A technology of ultra-low concentration and detection method, which is applied in the direction of measuring device, sampling device, color/spectral characteristic measurement, etc., can solve the problems of environmental temperature and humidity, poor long-term stability, high detection limit, etc., to ensure stability, temperature Constant, temperature-controlled effect

Pending Publication Date: 2020-08-21
PEKING UNIV
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[0006] Patents "A gas-sensitive material and preparation method for environmental monitoring of ammonia emissions" and "A ZnO/SiO-based 2 Nanostructured Passive Wireless Surface Acoustic Wave Ammonia Sensor" adopts the gas-sensing electrode method for rapid detection, which overc...

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  • On-line detection method and device for ultralow-concentration ammonia gas content
  • On-line detection method and device for ultralow-concentration ammonia gas content
  • On-line detection method and device for ultralow-concentration ammonia gas content

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Embodiment Construction

[0055] Below in conjunction with accompanying drawing, further describe the present invention through embodiment, but do not limit the scope of the present invention in any way.

[0056] The invention provides an online detection method and device for online detection of ultra-low concentration ammonia gas, based on the wet chemical method of gas diffusion, absorption and capture and absorption spectrum detection technology, to realize real-time online detection of ultra-low concentration ammonia gas content in various fields, On-line continuous detection of ultra-low concentration ammonia content. The invention adopts a total reflection long optical path online flow cell, and the solution reflects and absorbs light multiple times in the total reflection flow cell, and the online detection of ultra-low concentration ammonia gas content can be realized according to the absorbance, and the detection sensitivity and detection limit are improved. The invention provides an ultra-lo...

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Abstract

The invention discloses an on-line detection method and device for ultralow-concentration ammonia gas content. In the ammonia gas trapping process, gas to be detected passes through a spiral pipe trapping trap under the action of a vacuum diaphragm pump, and an ammonia gas component in the gas to be detected is absorbed in absorption liquid to obtain a solution to be detected containing ammonium ions. In the presence of sodium nitroprusside, ammonium ions, salicylic acid and sodium hypochlorite react to generate a blue complex indophenol blue; a liquid-phase sample to be detected enters a total-reflection long-optical-path online flow cell, and online detection of the content of ammonia gas in the gas to be detected is achieved according to the absorbance. The on-line detection device adopts an electromagnetically driven micro pump and a constant-flow peristaltic pump to accurately control a micro solution; daily maintenance is reduced; and rapid, on-line and continuous measurement ofultra-low to medium-high concentration ammonia gas is realized.

Description

technical field [0001] The invention belongs to the technical fields of environmental monitoring, industrial detection, indoor detection and air monitoring, and relates to an online detection technology of gaseous pollutants, in particular to an online detection method and device for ultra-low concentration ammonia gas content. Background technique [0002] In recent years, the demand for detection and control of gaseous pollutants has been increasing, among which ammonia (NH 3 ) is one of the most common pollutants that endanger human health and cause serious environmental problems. Ammonia comes from a wide range of sources, including livestock and poultry breeding, chemical industry, farmland fertilizer application, material combustion, human emissions, waste treatment and motor vehicle exhaust emissions. According to related reports, chronic lung disease is related to the inhalation of ammonia. Ammonia deposition in ammonia will cause eutrophication of water body and a...

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Application Information

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IPC IPC(8): G01N21/78G01N21/31G01N21/01G01N1/24G01N1/22
CPCG01N1/22G01N1/2202G01N1/2214G01N1/2273G01N21/01G01N21/31G01N21/78G01N21/783G01N2001/2217G01N2001/2282G01N2021/0112G01N2021/786
Inventor 董华斌祖可欣曾立民
Owner PEKING UNIV
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