A rapid detection system and method for microplastics in offshore sediments

A detection system and microplastic technology, applied in pattern recognition in signals, analysis materials, measurement devices, etc., can solve the problems of incomplete information acquisition, long time-consuming, low work efficiency, etc., and achieve improved spectral resolution and improved resolution , the effect of high luminous flux

Active Publication Date: 2021-05-28
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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  • A rapid detection system and method for microplastics in offshore sediments
  • A rapid detection system and method for microplastics in offshore sediments
  • A rapid detection system and method for microplastics in offshore sediments

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Embodiment 1

[0101] 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;

[0102] 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 ;

[0103] 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

[0125] 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:

[0126] (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.

[0127] (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.

[0128] (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 method for microplastics in offshore sediments. The visual light source of the detection system is supplemented by a microscopic unit and a fluorescence imaging unit to make the detection process of microplastics more visualized; the fluorescence imaging unit and Raman detection The joint application of the system, through the auxiliary function of the three-dimensional translation stage, enables the Raman detection system to quickly find the region of interest, thereby automatically identifying the fluorescence signal of the microplastic, and greatly improving the detection efficiency; at the same time, the Raman spectroscopy technology and the standard optical microscope Phase coupling, so that the collected Raman signal returns to the spatial heterodyne Raman spectrometer through the microscopic unit, so as to achieve simultaneous acquisition of high-throughput, wide-band, and high-resolution Raman spectra; The signal is collected twice, and then the pure Raman spectrum signal is obtained through differential calculation and multiple 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 Patents(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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