Method for detecting concentration of micro-plastic by using near-infrared 1550nm laser

A microplastic and laser technology, applied in the field of environmental pollutant detection, can solve the problems of high equipment requirements, long time-consuming, long process, etc., and achieve the effects of low photon energy, good safety, and good wall penetration.

Active Publication Date: 2020-07-31
CENT SOUTH UNIV
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Problems solved by technology

This method requires the use of fluorescent labeling and fluorescent detection, which requires high equipment, long and complicated procedures, and takes a long time

Method used

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  • Method for detecting concentration of micro-plastic by using near-infrared 1550nm laser
  • Method for detecting concentration of micro-plastic by using near-infrared 1550nm laser
  • Method for detecting concentration of micro-plastic by using near-infrared 1550nm laser

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Embodiment 1

[0037] This embodiment includes the following steps:

[0038] (1) Weigh 20mg of microplastic particles, then add 100mL of water to obtain a microplastic aqueous suspension with a concentration of 0.2mg / mL, then dilute and ultrasonically disperse to obtain concentrations of 0.02, 0.04, 0.06, 0.08, 0.10 and 0.12 mg / mL series microplastic water suspension standard solution, ultrasonic dispersion time is 2h, so that the microplastic particles are evenly dispersed;

[0039] (2) build as figure 1The shown diffraction experimental device includes: a laser 101, and a first optical attenuator 102, a focusing lens 103, a sample stage, and a quartz colorimeter with an optical path of 1 cm arranged on it in the direction of the main optical axis of laser light propagation. Dish 104, second optical attenuator 105, beam quality analyzer 106, described beam quality analyzer is connected with PC; Wherein, described laser is femtosecond pulse laser, and its pulse width and repetition frequen...

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Abstract

The invention relates to a method for detecting the concentration of micro-plastics in water by using a near-infrared 1550nm laser. The method comprises the following steps: (1) preparing n parts of series micro-plastic water suspension standard solutions with different concentrations from micro-plastic particles by using a dispersion method, and uniformly distributing the concentrations of the series micro-plastic water suspension standard solutions within 0.02-0.12 mg / mL; (2) performing a diffraction experiment on the series of micro-plastic water suspension standard solutions prepared in the step (1) at a laser wavelength of 1550 nm to obtain a diffraction image, and recording the number of rings in the diffraction image to obtain a corresponding relationship between the concentration of the micro-plastic water suspension and the number of rings; and (3) carrying out the same diffraction experiment on the to-be-detected micro-plastic water suspension to obtain the ring number of thediffraction image, and obtaining the micro-plastic concentration of the to-be-detected micro-plastic water suspension according to the corresponding relationship between the concentration and the ring number under the wavelength. The detection method is simple and efficient, and the concentration of the micro-plastic in the water can be detected in a short time.

Description

technical field [0001] The invention belongs to the field of environmental pollutant detection, and in particular relates to a method for detecting the concentration of microplastics by using a near-infrared 1550nm laser. Background technique [0002] At present, my country's research on microplastics in water bodies and food webs is still in its infancy, and there are very few studies on the distribution and concentration of microplastics in rivers, oceans and lakes. Globally, due to the uneven distribution of microplastics and the limitations of sample collection, separation and identification methods, domestic and foreign reports on microplastics with a diameter of less than 20 μm still need to be increased, especially for the particle size range. According to the source classification, there are mainly two types of plastic particles in water, namely primary plastic particles and secondary plastic particles. The former refers to the microplastic products produced in indu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/45G01N21/47
CPCG01N21/45G01N21/4788
Inventor 肖思王一多何奕林胡清楠秦应霖何军
Owner CENT SOUTH UNIV
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