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Non-radioactive method for online monitoring ammonia

An ammonia gas and carrier gas technology, which is applied in the field of subordinate ion mobility spectrometry, can solve problems such as limiting wide application, and achieve the effect of improving selectivity and facilitating large-scale application.

Active Publication Date: 2019-06-14
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the ionization sources currently used are all radioactive 63 Ni, which limits its wide application

Method used

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  • Non-radioactive method for online monitoring ammonia
  • Non-radioactive method for online monitoring ammonia
  • Non-radioactive method for online monitoring ammonia

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Embodiment 1

[0026] Reagent molecule-assisted photoionization positive ion mobility spectrometry is used to detect ammonia gas, and the reagent molecules of acetone, 2-butanone and p-xylene are optimized to be screened. The drift flow rate range is 200-400ml / min, and the tail gas flow rate range is 350-650ml / min. The electric field strength range in the migration zone is 200-250V / cm, and the ion migration spectrum of ammonia gas is shown in figure 2 with image 3 As shown, there is no signal response of ammonia gas when acetone and anisole are added as reagent molecules. Such as Figure 4 with 5 As shown, both 2-butanone and p-xylene have signal responses when they are used as reagent molecules, but the product ions of the obtained ammonia gas are different, and the reduced mobility of the reagent ions 2-butanone and p-xylene are 1.66cm 2 V -1 the s -1 , 2.00cm 2 V -1 the s -1 , the reduced mobility of the product ions are 1.74 cm 2 V -1 the s -1 , 2.37cm 2 V -1 the s -1 , ...

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Abstract

The invention discloses a non-radioactive device and method for rapidly and accurately monitoring ammonia. A non-radioactive ion migration spectrum of reagent molecule assisted photo ionization is utilized, under a positive ion mode, reagent molecules, namely paraxylene are optimally screened to serve as reagent molecules, and the ammonia is rapidly, accurately and highly-sensitively measured online. The detection device comprises bleached gas, a mass flow meter, carrier gas, a reagent molecular generator, an ion migration spectrum system, a vacuum pump and the like.

Description

technical field [0001] The invention belongs to the technical field of ion mobility spectrometry. Utilize non-radioactive vacuum ultraviolet lamp ion mobility spectrometry, adopt suction sampling in positive ion mode, and optimize the screening of reagent molecules, p-xylene, trigger chemical reactions, improve the sensitivity and selectivity of ammonia detection, and realize ammonia Rapid and accurate online monitoring of gas. technical background [0002] Ammonia is a colorless inorganic gas with a strong pungent odor, easily soluble in water, a Lewis base, and exists in the human body and the environment. [0003] In humans, ammonia plays an important role and is considered an important exhaled breath biomarker. The main sources of ammonia in the human body include: deamination of amino acids, most of the amino acids in the kidney will form glutamic acid through transamination with α-ketoglutarate under the action of glutaminase. In addition, ammonia can also be produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62
Inventor 李海洋厉梅黄卫陈红蒋丹丹
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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