A system and method for chemical ionization mass spectrometry analysis of ammonia in atmospheres with different humidity

A chemical ionization and mass spectrometry analysis technology, applied in the field of atmospheric pressure chemical ionization mass spectrometry analysis system, can solve the problems of background signal increase, sensitivity decrease, ammonia signal intensity instability, etc., to eliminate quantitative influence and improve sensitivity

Active Publication Date: 2022-03-29
SHANDONG UNIV
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Problems solved by technology

[0005] However, there is a common problem in chemical ionization mass spectrometry used for ammonia detection, that is, its quantitative accuracy is easily affected by the air humidity in the environment, and the atmosphere with high humidity will lead to increased background signals and unstable ammonia signal intensity , the sensitivity decreased compared to the dry condition

Method used

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  • A system and method for chemical ionization mass spectrometry analysis of ammonia in atmospheres with different humidity
  • A system and method for chemical ionization mass spectrometry analysis of ammonia in atmospheres with different humidity
  • A system and method for chemical ionization mass spectrometry analysis of ammonia in atmospheres with different humidity

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Effect test

Embodiment 1

[0052] like figure 1 As shown, the method involves an atmospheric pressure chemical ionization mass spectrometer for the detection of atmospheric ammonia of varying humidity. In the background / atmospheric ammonia sample detection, it is introduced into the chemical ionization zone between the curtain electrode and the transmission electrode at a flow rate of 400mL / min under the condition of known humidity, and the acetone reagent is purged with high-purity nitrogen at a flow rate of 100mL / min. Enter the acetone protonation zone between the repelling electrode and the curtain electrode, where the acetone is irradiated by a vacuum ultraviolet lamp to generate photoionization, and the dry nitrogen gas enters the dilution zone between the transfer electrode and the capillary electrode at a flow rate of 1200 mL / min for dilution. Finally, it enters the mass spectrometer for detection. Each background / sample detection was performed three times, and each detection time was 60s. The a...

Embodiment 2

[0054] The 50ppb ammonia sample under 90% humidity was tested without adding dry nitrogen for dilution and adding dry nitrogen for dilution. After adding dry nitrogen for dilution, the peak signal of the characteristic peak m / z 76 of ammonia gas increased by 3.75 times.

Embodiment 3

[0056] A concentration gradient of 1–150 ppb was prepared using a 5 ppm ammonia standard gas at zero humidity for standard curve drawing, and the signal was normalized to m / z 76 peak signal detected with ammonia sample minus m / z when background detected 76 peak signal, the difference is then divided by the acetone reagent ion m / z 117 peak signal, the obtained signal value is the final normalized signal, and the standard curve is drawn with this signal as the final signal, and normalized with the unprocessed signal The normalized standard curve was compared, and the linear fitting degree of the standard curve after signal normalization (R 2 = 0.9856) is significantly better than the standard curve fit without signal normalization (R 2 =0.8340).

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Abstract

The invention provides an atmospheric pressure chemical ionization mass spectrometry system, method and application for detecting ammonia in atmospheres with different humidity, belonging to the technical field of analysis and detection. Wherein, the system includes a three-zone ionization source device and a mass spectrometer; the three-zone ionization source device includes an ionization source cavity, and a vacuum ultraviolet lamp is arranged inside the ionization source cavity, and the inside of the ionization source cavity is along the vacuum ultraviolet A repulsion electrode, a curtain electrode, a transmission electrode and a capillary electrode are sequentially arranged in the light emitting direction. The invention adopts the combined design of three-zone ionization source and dilution gas, which improves the sensitivity of detection and eliminates the influence of humidity on ammonia gas detection; adopts a signal normalization method, and utilizes the humidity correction coefficient to convert the ammonia gas sample signals with different humidity Conversion, combined with the standard curve at zero humidity, the accurate quantitative detection of ammonia gas under different humidity conditions has been realized, so it has good practical application value.

Description

technical field [0001] The invention belongs to the technical field of analysis and detection, and in particular relates to an atmospheric pressure chemical ionization mass spectrometry analysis system, method and application for detecting ammonia gas in different humidity atmospheres. Background technique [0002] The information disclosed in this Background section is only for enhancement of understanding of the general background of the invention and should not necessarily be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. [0003] Ammonia (NH 3 ) plays an important role in atmospheric chemistry and is the main alkaline gas in the atmosphere. There are many sources of ammonia in the atmosphere, mainly from animal husbandry, biomass combustion, farmland fertilizers, vehicle exhaust emissions, and various industrial processes. NH 3 The acidity of atmospheric aerosols c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/64
CPCG01N27/64
Inventor 侯可勇董丰硕刘瑞东刘兵党敏
Owner SHANDONG UNIV
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