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Micro-plastic aging behavior evaluation method

An evaluation method and technology for microplastics, which can be used in the analysis of materials, material separation, material inspection products, etc., and can solve the problems of lack of microplastic aging evaluation methods and environmental behavior of single microplastics.

Pending Publication Date: 2022-05-31
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are many research reports on the aging of microplastics, their environmental behavior after aging, and ecotoxicity. However, they are all single-sided studies on the environmental behavior of microplastics, and there is a lack of systematic and comprehensive microplastic aging evaluation methods.

Method used

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  • Micro-plastic aging behavior evaluation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment 1: the chloride ion detection method steps of halogen-containing microplastic PVC are as follows:

[0054] (1) Prepare PVC microplastic powder, prepare simulated solutions containing different environmental factors, measure 50 mL of simulated solution into a light tube, add 1 g of PVC microplastics, conduct a simulated light experiment, and add a magnetic stirring rotor to disperse and suspend the plastic particles;

[0055] (2) Take 1 mL of solution with a pipette at 0, 0.5, 1.5, 3, 6, and 12 h respectively, and use an ion chromatograph to detect the chloride ion concentration after dilution;

[0056] The change of chloride ion concentration in solution with aging time is shown in figure 1 ,from figure 1 It can be seen that the photoaging process of PVC microplastics is accompanied by the shedding of chlorine. And the simulated aging environment is different, and the degree of chlorine removal is different. Detection of chloride ion concentration in the a...

Embodiment 2

[0057] Embodiment 2: The concrete steps of PET microplastic fluorescence detection are:

[0058] (1) Prepare PET microplastic powder, prepare simulated solutions containing different environmental factors, measure 50 mL of simulated solution into a lighting tube and add 1 g of PVC microplastics to conduct a simulated lighting experiment, and add a magnetic stirring rotor to disperse and suspend the plastic particles;

[0059] (2) Collect the PET microplastics in batches of 12, 24, and 48 hours of photoaging, wash and dry them, and detect the fluorescence spectrum of the microplastic powder with a fluorometer. Detection conditions: excitation wavelength 340nm, detection range: 350-600nm, observe the change of fluorescence intensity at 460nm.

[0060] The fluorescence changes of PET microplastics with aging time are shown in figure 2 , figure 2 (a), (b), and (c) are the fluorescence spectra of 12, 24, and 48 hours of aging, respectively. It can be seen from the figure that t...

Embodiment 3

[0061] Example 3: Select the PVC microplastic powder aged by the method in Example 1 to test its infrared spectrum, observe the change of functional groups caused by the aging of the microplastic, and calculate the vinyl index and carbonyl index according to the infrared spectrum data. The corresponding infrared spectrum and index calculation results are shown in image 3 and Figure 4 . from image 3 It can be seen that the absorption peaks of double bonds and carbonyl groups of PVC microplastics change after aging, and the aging behavior of microplastics can be judged by the infrared absorption peaks. In this example, 1430cm is selected -1 The methylene absorption peak at is the reference peak for exponential calculation, from Figure 4 The changes of vinyl index and carbonyl index with aging time can be seen in the results, and the index changes caused by the aging of microplastics can be used to evaluate the aging behavior of microplastics.

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Abstract

The invention discloses a micro-plastic aging behavior evaluation method, and belongs to the field of new pollutant environment behavior evaluation. The method comprises the following schemes: (1) preparing an evaluation sample; (2) apparent color judgment; (3) microscopic morphology observation; (4) halogen element detection; (5) detecting an oxygen element; (6) plastic fluorescence detection; (7) detecting functional groups; (8) carrying out an adsorption behavior experiment; and (9) carrying out an ecological toxicity experiment. According to the evaluation method, a plurality of micro-plastic aging behavior evaluation schemes are provided, and one or more schemes can be selected for evaluation work according to different factors such as micro-plastic types and aging modes. Aging experiments of PVC and PET micro-plastics prove that the method is effective and high in repeatability, and has the basis of popularization to other micro-plastics. The evaluation method can provide a theoretical basis for micro-plastic aging behavior research and micro-plastic environment behavior and ecological risk evaluation, and has relatively high scientific guiding significance.

Description

technical field [0001] The invention relates to a microplastic aging behavior evaluation method, which belongs to the field of environmental behavior evaluation of new pollutants. Background technique [0002] At present, the global plastic production exceeds 320 million tons per year, and the production is expected to double in the next 20 years. The most used plastics are mainly polyvinyl chloride (PVC), polystyrene (PS), polyethylene (PE) and Most of the used plastic products such as polyethylene terephthalate (PET) will be discharged into the environment, and these plastics discharged into the environment are difficult to be degraded and exist for a long time. The problem of microplastic pollution caused by plastic emissions has attracted great attention in recent years. [0003] Microplastics are generally defined as plastics less than 5 mm in diameter. Due to the characteristics of environmental persistence, small particle size, large quantity and wide distribution o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3563G01N21/64G01N21/84G01N23/2251G01N23/2273G01N30/02G01N17/00G01N15/08G01N33/44
CPCG01N21/3563G01N21/64G01N21/84G01N30/02G01N23/2273G01N23/2251G01N17/004G01N15/08G01N33/442G01N2015/0866
Inventor 潘学军刘坤乾郭子维何欢黄斌
Owner KUNMING UNIV OF SCI & TECH
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