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Microfluidic in-situ SERS detection method for detecting trace mercury ions

A detection method, a technology of mercury ions, applied in measuring devices, instruments, material analysis through optical means, etc., can solve the problems of inapplicability to daily water quality monitoring and field application, complex sample preparation process, expensive detection equipment, etc., and achieve improvement Repeatability and sensitivity, controllable contamination, high sensitivity effect

Pending Publication Date: 2021-11-09
CAPITAL NORMAL UNIVERSITY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods basically require expensive detection equipment, complicated sample preparation process and long measurement time, are not suitable for daily water quality monitoring and field application, and are difficult to be widely promoted

Method used

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  • Microfluidic in-situ SERS detection method for detecting trace mercury ions
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  • Microfluidic in-situ SERS detection method for detecting trace mercury ions

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Embodiment Construction

[0032] In the drawings, the same or similar reference numerals are used to denote the same or similar elements or elements having the same or similar functions. Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] In the description of the present invention, the terms "central", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", " The orientation or positional relationship indicated by "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device or element Must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the scope of the invention.

[0034] In the case of no conflict, ...

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Abstract

The embodiment of the invention discloses a micro-fluidic in-situ SERS detection method for trace mercury ion detection, which comprises the following steps: introducing a mixed solution of silver nitrate and sodium citrate into a micro-fluidic chip interface 1, and directly preparing a silver nano aggregate as an SERS substrate in a micro-fluidic pipeline by adopting a laser micro-area photo-reduction method; introducing a NaI solution into an interface 2 of the micro-fluidic chip, and carrying out I-modification on the silver nano aggregate; a crystal violet solution is introduced into an interface 3, and an SERS signal of the silver nano aggregate is collected; a sample Hg < 2 + > solution is introduced into an interface 4, and SERS signals are collected again in situ; counting the decrease rate of the SERS intensity of the crystal violet molecules before and after the action of the Hg < 2 + > to realize sensing of the Hg < 2 + >; furthermore, repeating the steps are repeated to measure the Hg < 2 + > samples with different concentrations, thereby obtaining the function relation between the logarithm of the Hg < 2 + > concentration and the SERS intensity reduction rate. The method provides a basis for quantitative detection of the Hg < 2 + >.

Description

technical field [0001] The invention relates to the technical field of Raman spectroscopy detection, in particular to a microfluidic in-situ SERS (Surface-Enhanced Raman Scattering, surface-enhanced Raman scattering) detection method for detection of trace mercury ions. Background technique [0002] Mercury ions exist in large quantities in industrial wastewater. Aquatic organisms can directly absorb and enrich mercury from the water body. When people eat mercury-contaminated water or food, it will cause disease. Obviously, mercury ions seriously threaten the safety of the ecological environment and human life and health. The World Health Organization (Word Health Organizations, WHO) stipulates that the upper limit of mercury ions in drinking water is 0.001mg / L (5nM). Therefore, the rapid and sensitive detection of mercury ions in water is very important. [0003] Currently available detection methods include chromatography, spectrophotometry, atomic fluorescence spectrosc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 杨龙坤张慧娟李志鹏张彤彤王东
Owner CAPITAL NORMAL UNIVERSITY
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