Organophosphorus detection method based on hollow-core fiber

Abstract

The invention belongs to the field of analytical chemistry technology, and discloses an organophosphorus detection method based on a hollow-core fiber. The method comprises following steps: an organophosphorus sample solution is injected into the hollow-core fiber, wherein the inner wall of the hollow-core fiber is provided with nanoparticles; incidence of exciting light is performed through one end of the hollow-core fiber, and emergent light, which is enforced by total reflection of the inner wall of the hollow-core fiber and the nanoparticles, is detected by a Raman spectrum acquisition system at the other end so as to obtain a Raman spectrum; the Raman spectrum is analyzed, the kind of the organophosphorus sample is determined based on the change of Raman peak positions, and the concentration of the organophosphorus sample is determined based on the intensity of Raman peaks. Total reflection of light signals is realized by taking the hollow-core fiber as a surface enhanced Raman substrate in the detection of organophosphorus; light attenuation of light propagation process in the hollow- core fiber is relatively less, and is negligible, so that signal enhancement is more significant; the organophosphorus detection method is low in cost; and sample amount required by the organophosphorus detection method is precious little.

Description

technical field [0001] The invention relates to the technical field of analytical chemistry, in particular to an organic phosphorus detection method based on a hollow-core optical fiber. Background technique [0002] In recent years, food safety is facing great challenges and people's health is threatened, so the detection of low-concentration trace substances has become a research hotspot. Compared with other spectra, Raman spectroscopy can provide rich molecular structure and molecular vibration information, so it has become a powerful tool for material analysis and material identification. But in the process of practical application, since the Raman scattering cross section is 10 30 The order of magnitude is only one thousandth of Rayleigh scattering, and it is easily overwhelmed by the fluorescent background, thus limiting its application in various fields. If metals with different forms of roughening are used as substrates, the Raman scattering intensity can be increa...

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Problems solved by technology

[0004] Since the discovery of the SERS effect, various SERS substrates with Raman enhancement effects have been continuously prepared. SERS substrates with super Raman enhancement effects and easy access have always been a research hotspot. In recent years, various SERS substrates with different SERS substrates with topographical structures are continuously prepared by researchers, but the preparation process of these SERS substrates is complicated, the required equipment is expensive, and they cannot be reused, which will cause a waste of energy resources, so that the use of surface-enhanced Raman scattering for signal Enhanced analysis of chemical substances mostly stays in the laboratory stage and cannot be promoted in practical applications

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