A microplastic detection device and method based on pyrolysis-mass spectrometry

Abstract

The invention relates to a microplastic detection device and method based on pyrolysis-mass spectrometry technology, which solves the problem of complex structure, inconvenient operation, inability to accurately realize quantitative analysis of each component in microplastics, and easy detection of microplastic content in the prior art. Environmental interference, large errors, low accuracy, time-consuming and labor-intensive, large equipment footprint, can only be operated in the laboratory, and difficult to apply to the technical problems of on-site testing. The microplastic detection device based on pyrolysis-mass spectrometry technology provided by the present invention, the device as a whole is a closed gas circuit device system connected by pipelines, and the device is sequentially connected to include a working gas source, a pyrolysis device, a filter and a mass spectrometer, After putting the microplastic sample into the pyrolysis device, the microplastic sample is pyrolyzed through the pyrolysis device, and the pyrolysis product of the microplastic sample is driven by the working carrier gas, and then filtered by the filter and then enters the mass spectrometer for detection and analysis; At the same time provide its method. The invention is widely used in the technical field of microplastic detection.

Description

technical field [0001] The invention relates to the technical field of microplastic detection, in particular to a microplastic detection device and method based on pyrolysis-mass spectrometry technology. Background technique [0002] Plastic is the most common organic synthetic polymer material in daily life. It is widely used because of its low price, light weight, convenient use and many other advantages. According to statistics, in 2013, the global consumption of plastic products was as high as 300 million tons. In 2016, Greenpeace reported that about 200kg of plastics entered the ocean every second, and the use of plastics is still growing. About 10% of the plastic waste will enter the ocean. , the remaining plastic waste pollutes the terrestrial environment through recycling, incineration, landfill, and discarding. Plastic waste accumulates continuously in the environment, and its chemical properties are relatively stable. Most plastics are difficult to degrade and wil...

AI Technical Summary

Problems solved by technology

For emerging pollutants, the detection and analysis technology of microplastics is still immature, and there is a lack of rapid and simultaneous qualitative and quantitative methods, which is also one of the important topics of microplastics research.

At present, the qualitative detection of microplastics mainly relies on three methods: Raman spectroscopy, Fourier-infrared spectroscopy, and pyrolysis-gas phase mass spectrometry. Due to the size limitation of the target object, the spectral method generally requires more than 10um and is susceptible to environmental interference. At present, The quantitative method mainly relies on microscopes and other tools for manual counting, which has large errors, low accuracy and is time-consuming and laborious.

The Chinese patent application number is 201610045344.3, and the patent application document published on June 15, 2016 discloses a method for quantitatively analyzing the enrichment and distribution of microplastics in mammals. The method of quantitatively analyzing the accumulation and distribution of microplastics in mammals belongs to the field of environmental health risk assessment. The steps are cumbersome and complicated, and there are many interference factors. The detection data results have large errors, low accuracy rate, and time-consuming and laborious

[0006] Moreover, the current research on the health risks of the combined effects of microplastics and environmental pollutants is mostly focused on the assessment of terminal toxicity, and seldom evaluates the content of organic pollutants adsorbed on microplastics. The knowledge is still only at the level of the toxicity of microplastics themselves, so there is no systematic quantitative analysis of the amount of pollutants absorbed by microplastics into the organism, let alone the abundance of microplastics in the main organs of mammals. collection and distribution, which brings many uncertainties to the toxicity assessment of the combined effects of microplastics and pollutants in the later stage

Moreover, the existing quantitative detection instruments are bulky, high power consumption, and expensive, and can only be operated in the laboratory, which is difficult to apply to ship-mounted, vehicle-mounted and on-site detection, which limits the investigation and research of microplastics

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