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

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...

AI Technical Summary

Problems solved by technology

[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 overcomes the disadvantages of the existing ammonia detection, such as being easily affected by ambient temperature and humidity, poor long-term stability and poor selectivity.

However, it still has the disadvantages of being easily interfered by other gases and having a high detection limit.

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