A method for detecting microplastic concentration using near-infrared 1550nm laser

Abstract

A method for detecting the concentration of microplastics in water using a near-infrared 1550nm laser, (1) using microplastic particles to prepare n series of microplastics water suspension standard solutions with different concentrations through a discrete method, and the concentration of the series of microplastics water suspension standard solutions Evenly distributed within 0.02 ~ 0.12 mg / mL; (2) Use the series of microplastic water suspension standard solutions prepared in step (1) to conduct diffraction experiments at a laser wavelength of 1550 nm to obtain a diffraction image and record the number of rings in the diffraction image , obtain the corresponding relationship between the concentration and ring number of the microplastic aqueous suspension; (3) Conduct the same diffraction experiment on the microplastic aqueous suspension to be measured to obtain the ring number of the diffraction image, and then based on the corresponding relationship between the concentration and the ring number at this wavelength , to obtain the microplastic concentration of the microplastic aqueous suspension to be measured. The detection method is simple and efficient, and can detect the concentration of microplastics in water 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...

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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

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