Rapid detection system and detection method for micro-plastics in offshore sediments based on spatial heterodyne Raman spectrum technology

A technology of Raman spectroscopy and spatial heterodyning, which is applied in the direction of analyzing materials, Raman scattering, and measuring devices. It can solve problems such as time-consuming, inability to analyze microplastics, and error in detection results, and solve high analysis costs and eliminate fluorescence. Effect of Interference, Accurate Quantitative Analysis

Active Publication Date: 2020-08-11
OCEAN UNIV OF CHINA
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  • Application Information

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Problems solved by technology

However, the interference of background fluorescence in Raman detection in this method will cause certain errors in the detection results; this method will be quite time-consuming to fully inspect the images in the SEM image, which limits the number of microscopic images that can be analyzed within a certain period of time. amount of plastic, resulting in less efficient work
[0005] Existing microplastics detection methods have problems such as high false detection rate, long time-consuming, and incomplete information acquisition, which cannot meet the needs of rapid and accurate detection of microplastics, and cannot simultaneously obtain high-flux, wide-band, and high-resolution images. Mann spectral information, unable to accurately analyze microplastics with complex components

Method used

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  • Rapid detection system and detection method for micro-plastics in offshore sediments based on spatial heterodyne Raman spectrum technology
  • Rapid detection system and detection method for micro-plastics in offshore sediments based on spatial heterodyne Raman spectrum technology
  • Rapid detection system and detection method for micro-plastics in offshore sediments based on spatial heterodyne Raman spectrum technology

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Embodiment 1

[0100] A rapid detection system for microplastics in offshore sediments based on spatial heterodyne differential Raman spectroscopy, such as figure 1 As shown, the system includes a three-dimensional electric translation stage 1, a visual light source unit, a microscopic unit 3, a tunable laser 4, a spliced ​​grating-type spatial heterodyne Raman spectrometer 5, a fluorescence imaging unit 6, and a data acquisition and storage unit 7;

[0101] A sample stage 1a is arranged on the three-dimensional electric translation stage 1, and a microscopic unit 3, a non-polarizing beam splitter cube 4d, and a fluorescence imaging unit 6 are sequentially arranged above the sample stage 1a, and the fluorescence imaging unit 6 is connected with a data acquisition and storage unit 7 ;

[0102] In this embodiment, the calculation accuracy of the three-dimensional electric translation stage 1 is 0.1 μm. The three-dimensional electric translation platform 1 has the functions of automatic positi...

Embodiment 2

[0124] The detection method of microplastics in the offshore sediment based on the rapid detection system that embodiment 1 provides, such as image 3 As shown, it specifically includes the following steps:

[0125] (1) Offshore sediments were sampled with a Van Veen grab sampler, and the collected samples were wrapped with double-layer aluminum foil and put into a polyethylene tight bag, frozen in a 4°C refrigerator, transported to the laboratory and placed in - Store refrigerated at 20°C.

[0126] (2) Before the experiment, the samples need to be thawed in a fume hood, placed in clean beakers and sealed with aluminum foil, and dried in a 60°C oven to constant weight for further processing.

[0127] (3) For sediment samples dried to constant weight, each 10 g of sediment samples was treated with 50 mL of hydrogen peroxide for 24 hours, with a volume fraction of hydrogen peroxide of 30%, to remove natural organic matter and eliminate fluorescence interference caused by natura...

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Abstract

The invention relates to a rapid detection system and a detection method for micro-plastics in offshore sediments based on a spatial heterodyne Raman spectrum technology. A visual light source of thedetection system is assisted by a microscopic unit and a fluorescence imaging unit, so that the detection process of the micro-plastics is more visual; through the combined application of the fluorescence imaging unit and the Raman detection system, the Raman detection system can quickly find an interested area through the auxiliary effect of the three-dimensional displacement table, so that a micro-plastic fluorescence signal is automatically recognized, and the detection efficiency is greatly improved; meanwhile, a Raman spectrum technology is coupled with a standard optical microscope, so that an acquired Raman signal returns to the spatial heterodyne Raman spectrometer through a microscopic unit, and Raman spectra with high flux, broadband and high resolution are obtained at the same time; a tunable laser is used for carrying out secondary acquisition on a signal of a target sample point, and a pure Raman spectrum signal is obtained through differential calculation and a multi-constraint iterative algorithm.

Description

technical field [0001] The invention relates to a rapid detection system and detection method for microplastics in offshore sediments based on spatial heterodyne differential Raman spectroscopy technology, and belongs to the field of microplastics detection using Raman spectroscopy technology. Background technique [0002] Microplastics are plastic films, fibers, particles and fragments with an effective diameter of less than 5mm. It can be generated by large plastics under environmental factors (light, heat, radiation, etc.), or it can be plastic microbeads added to facial detergents or toothpaste, and the latter is far more than the former. In the past ten years since the concept of microplastics was first proposed in 2004, it has been fully proved that microplastics are widely present in the marine environment. Microplastics are relatively stable and can exist in the environment for a long time, but their surface physical and chemical properties will change under the act...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65G01N15/06G01N21/64G06K9/00
CPCG01N21/65G01N15/06G01N21/643G01N2015/0693G06F2218/22
Inventor 薛庆生卢继涛杨柏王楠栾晓宁王福鹏李千
Owner OCEAN UNIV OF CHINA
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