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논문 기본 정보

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학술저널
저자정보
Sherzod Akhmedov (Arifov Institute of Ion Plasma and Laser Technologies) Azim Radjabov (Arifov Institute of Ion Plasma and Laser Technologies) Beknazar Kasimov (Arifov Institute of Ion Plasma and Laser Technologies) Ilkhomjan Saydumarov (Arifov Institute of Ion Plasma and Laser Technologies) Usman Khasanov (Arifov Institute of Ion Plasma and Laser Technologies) Shovkatjon Akhunov (Arifov Institute of Ion Plasma and Laser Technologies) Dilshadbek Usmanov (Arifov Institute of Ion Plasma and Laser Technologies)
저널정보
한국질량분석학회 Mass Spectrometry Letters Mass Spectrometry Letters Vol.16 No.1
발행연도
2025.3
수록면
13 - 21 (9page)

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In this work, we have studied the synthetic insecticides imidacloprid and chlordimeform on both oxidized and metallic tungsten thermoemitters in electric fields of E<10<sup>5</sup> V/cm using surface (thermal) ionization mass spectrometry. Imidacloprid (1-(6-chloro-3-pyridylmethyl)-N-nitroimidazol-2-ylideneamine) is a neurotoxic insecticide of the neonicotinoid family and is one of the most widely used in agriculture. Chlordimeform is a carboxamidine, classified as both a formamidine insecticide and acaricide, as well as a member of monochlorobenzenes. The experiments were conducted using the MI 1201 B magnetic static mass spectrometer, which was specifically modified for the surface ionization method. The studied samples were efficiently ionized on the oxidized thermoemitter, and the mass spectra consisted of M<sup>+</sup> , [M-H]<sup>+</sup> , [M-H-2nH]<sup>+ </sup>and [M-R]<sup>+</sup> ions. On the metallic thermoemitter, the mass spectra consisted of fewer lines compared to those obtained on the oxidized surface, indicating that no additional ions were generated. The mechanisms of ion formation on both oxide and metallic surfaces were discussed. For the first time, the ionization energies of the major ions of the studied compounds were evaluated using the surface ionization method, as well as the heat of sublimation of the molecules. Unimolecular decays were detected in the mass spectrum of chlordimeform. The surface ionization mass spectrometry data of samples was compared with the gas chromatography-mass spectrometry data.

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Abstract
Introduction
Experimental
Results and Discussion
Conclusions
References

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