Dielectrophoresis and laser-induced breakdown spectroscopy combined ocean micro-plastic particle identification and detection device and method

Abstract

The invention provides a dielectrophoresis and laser-induced breakdown spectroscopy combined ocean micro-plastic particle identification and detection device and method. The device comprises an ocean micro-plastic particle sorting device, an ocean micro-plastic particle identification and detection device and a display, according to the marine micro-plastic particle sorting device, a micro-fluidic chip is used as a sorting platform, a non-uniform electric field is generated by means of asymmetric through holes, marine micro-plastic particles in a non-uniform electric field area are polarized and subjected to dielectrophoretic force, and multi-stage sorting of the marine micro-plastic particles is achieved by means of dielectrophoretic force difference. And the ocean micro-plastic particle identification and detection device adopts a laser-induced breakdown spectrometer. And the display is used for assisting the laser-induced breakdown spectrometer, installing matched software and displaying the spectrum of the detected sample. The device is combined with the micro-fluidic chip and the laser-induced breakdown spectrometer, identification and detection of the marine micro-plastic particles are achieved, operation is easy and convenient, results are accurate and repeatable, and therefore the device can be widely applied to the research field of the marine micro-plastic particles.

Description

technical field [0001] The invention relates to the technical field of marine microplastic particle analysis, in particular, to a marine microplastic particle identification and detection device and method combining dielectrophoresis and laser-induced breakdown spectroscopy. Background technique [0002] Microplastics refer to those plastic fragments and particles with a diameter of less than 5 mm. In fact, the particle size of microplastics ranges from a few microns to a few millimeters, and is a mixture of heterogeneous plastic particles of various shapes. It is called "PM2.5 in the sea". Compared with "white pollution" plastics, the harm of marine microplastic particles is reflected in the small diameter of the particles, which is more harmful to the environment. [0003] Research has shown that microplastics become another non-negligible threat in the marine environment and have been detected globally, with large numbers of microplastic particles found in Africa, Asia, ...

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Problems solved by technology

[0005] The sorting and identification of microplastics is an indispensable step in the study of microplastics. Traditional microplastics sorting methods mainly include centrifugation, flow cytometry, and chromatographic analysis; microplastics identification and detection methods include visualization technology, Hyperspectral imaging and gas chromatography-mass spectrometry, etc. The disadvantages of these methods include complex operation steps, low separation efficiency, large sample volume, expensive equipment, etc.

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