Device for rapidly detecting trace volatile sulfides
A volatile sulfide and detection device technology, which is applied in the direction of measuring devices, material analysis through electromagnetic means, instruments, etc., can solve the problems of reduced ionization efficiency and other issues
Active Publication Date: 2017-06-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
However, the ionization efficiency of the vacuum ultraviolet lamp is related to the ionization energy and ionization cross section of the substance. For compounds with ionization energy higher than 10.0ev and smaller ionization cross section, such as hydrogen sulfide and methyl mercaptan, the ionization efficiency will be greatly reduced
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Embodiment 1
[0035] refer to figure 2 , using the present invention to test the exhaled breath of 21 normal people (13 males and 8 females) in the laboratory, the box plot statistics of the concentration distribution of S-containing compounds are as follows: figure 2 shown. It can be seen from the box plot that the content of methyl mercaptan, dimethyl sulfide, and allyl methyl sulfide in normal people is very low at about 5ppb, while the content of hydrogen sulfide is relatively high between 15 and 40ppb. Consistent with literature reports. Compared with the commonly used SIFT ionization source, the dibromomethane-assisted low-pressure photoionization source has the characteristics of no need to replace reagent ions, clean background, and no debris.
[0036] It can be seen from this example that the present invention can realize rapid and highly sensitive detection of various trace volatile sulfur compounds. This technology has very broad application prospects in environmental analys...
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Abstract
The invention relates to a device for rapidly detecting trace volatile sulfides. A concrete structure includes a Tedlar gas bag, a perfluorosulfonic acid membrane tube, a gas connecting pipeline, a dibromomethane reagent bottle, a gas two-way valve and a vacuum ultraviolet lamp ionization source. The vacuum ultraviolet lamp ionization source includes a vacuum ultraviolet lamp, an ionization source cavity, a baffle valve and a vacuum pump. The interior of the ionization source cavity is provided with a reagent molecule introduction tube and a sample molecule introduction tube; a repulsion transmission electrode group and a small hole electrode are both arranged along a vacuum ultraviolet lamp emitting direction; according to the method, trace sulfur-containing gas is collected by the Tedlar gas bag, is dried by the perfluorosulfonic acid membrane tube, and then enters an ionization region; the ionization source takes a low gas pressure charge transfer reaction as a mechanism, and dibromomethane sample molecules undergo a reaction with reagent ions generated by ionization with the vacuum ultraviolet lamp and are ionized. The device can realize rapid and high-sensitivity detection of sulfur-containing compounds such as trace hydrogen sulfide, methyl mercaptan, dimethyl thioether and the like, and has quite wide application prospects.
Description
technical field [0001] The invention relates to a mass spectrometry instrument, in particular to a device for rapidly detecting trace volatile sulfides. The device uses low-pressure charge-transfer reaction as the mechanism, combined with perfluorosulfonic acid membrane tube and dibromomethane-assisted low-pressure photoionization source, to achieve rapid and highly sensitive detection of various trace volatile sulfides. This technology has very broad application prospects in environmental analysis, medical diagnosis and other fields. Background technique [0002] Odor is one of seven typical public hazards (air pollution, water pollution, soil pollution, noise, vibration, land subsidence, and stench). Among the eight odorous substances, sulfides accounted for four: hydrogen sulfide, methyl mercaptan, methyl sulfide and dimethyl disulfide. The olfactory properties of volatile sulfur compounds (VSC) endanger people's health and the peace and comfort of life. Therefore, the...
Claims
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IPC IPC(8): G01N27/64
CPCG01N27/64
Inventor 李海洋蒋吉春王艳李庆运齐雅晨
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI