Quantitative determination of carbosulfan residues by surface-enhanced Raman spectroscopy

[Display omitted] •Based on density functional theory(DFT), the theoretical calculation and spectral peak position of carbosulfan were obtained.•SERS technology was used to detect carbosulfan residue.•Complexation was used to solve the problem of carbosulfan adsorbing onto silver nanoparticles.•The...

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Veröffentlicht in:Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Molecular and biomolecular spectroscopy, 2023-04, Vol.290, p.122315, Article 122315
Hauptverfasser: Ou, Quanhong, Tang, Biao, Jiang, Liqin, Han, Mingcheng, Yang, Weiye, Tang, Junqi, Liu, Gang
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Sprache:eng
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Zusammenfassung:[Display omitted] •Based on density functional theory(DFT), the theoretical calculation and spectral peak position of carbosulfan were obtained.•SERS technology was used to detect carbosulfan residue.•Complexation was used to solve the problem of carbosulfan adsorbing onto silver nanoparticles.•The quantitative determination of trace residue of carbosulfan was realized. Carbosulfan gets easily decomposed into carbofuran and 3-Hydroxy carbofuran in vegetables and forms harmful residues. To detect the residues of carbosulfan in vegetables (for example, cowpeas), a super-sensitive method of surface-enhanced Raman spectroscopy (SERS) was used in this work. Silver sol was prepared as the SERS substrate. To solve the adsorption problem of carbosulfan on Ag nanoparticles, 2, 6-dichloroquinone-4-chlorimide (chromogenic agent), and sodium hydroxide were added in carbosulfan to generate a complex, which was then mixed with the silver sol in the best proportion to examine SERS spectra. According to density functional theory calculations, the spectral peak positions of carbosulfan were determined. The optimal mixing ratio of the complex and the silver sol to obtain the optimal SERS spectrum and the detection limit of carbosulfan were investigated. The ultra-sensitive detection of carbosulfan residues (8.7 × 10-11 g/L) in cowpeas was realized. The results of this work indicate that SERS is a promising technique for detecting single-molecule pesticide residues in vegetables.
ISSN:1386-1425
1873-3557
DOI:10.1016/j.saa.2022.122315