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Method for detecting degradation condition of mulching film source micro-plastics in soil

A detection method and technology of microplastics, which are applied in the directions of measuring devices, analytical materials, color/spectral characteristics measurement, etc., can solve the problem of the inability to obtain the physical information of microplastic particle size, shape, and surface morphology characteristics, and the inability to visually see microplastics Surface degradation and other issues, to achieve the effect of simple operation

Inactive Publication Date: 2019-08-30
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can quantitatively analyze the content of microplastics in complex matrices such as soil, it cannot obtain physical information such as particle size, shape, and surface morphology of microplastics in the sample, so it is impossible to directly see the degradation of microplastics on the surface

Method used

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  • Method for detecting degradation condition of mulching film source micro-plastics in soil
  • Method for detecting degradation condition of mulching film source micro-plastics in soil

Examples

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Embodiment 1

[0027] (1) Degradation experiment

[0028] Set the concentration of the butylene adipate copolymer mulch film source microplastics in the soil to 1%, and disperse them evenly in the soil. In an incubator at 24±1°C, under 4500 lx irradiation, 12:12 hours light:dark cycle every day, to simulate the degradation behavior in the environment. The soil uses OECD standard soil: the main characteristics are 69.5% sand, 20% kaolin, 10% peat moss, 0.5% CaCO 3 . After the standard soil is sieved with 80 meshes, its water content is controlled at 20%-25%.

[0029] (2) Separation and extraction of plastic film source microplastics

[0030] Take 10g of the degraded soil and dry it with a sieve to remove microplastics with larger particle sizes, then transfer the sieved soil to a saturated NaCl solution, shake it sufficiently to suspend the microplastics in the solution, and let it stand to suspend The solution was layered with the soil solids, and then the solution suspended with mulch-d...

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Abstract

The invention relates to a method for detecting the degradation condition of mulching film source micro-plastics in soil. The method comprises the steps of: taking soil to be detected, screening micro-plastics having relatively large particle diameter after drying, then, adding into saturated NaCl solution, sufficiently oscillating, so that the micro-plastics suspend in the solution, standing, sothat suspension liquid and soil solids are layered, then, pouring the suspension liquid, performing suction filtration, cleaning the filtered micro-plastics by using absolute ethyl alcohol, and then,drying by putting in a vacuum drying box, so that a sample to be detected is obtained; and, taking the sample to be detected, and analyzing change of the micro-plastic carbon-based index, the crystallization degree and the sample surface morphology by using a Fourier infrared spectrometer and a scanning electron microscope, so that the degradation condition is evaluated. The method in the invention is simple, convenient and rapid; the degradation change condition of the mulching film source micro-plastics in the soil can be directly seen; furthermore, the micro-plastic structure does not needto be destroyed; and the ecological risk of the soil after the mulching film source micro-plastics are degraded can be further evaluated through the method in the invention.

Description

[0001] (1) Technical field [0002] The invention relates to a method for identifying the degradation of mulch film source microplastics in a soil environment. [0003] (2) Background technology [0004] Microplastic pollution has become a hot issue of global concern. At present, most of the research on microplastic pollution focuses on the marine environment, but most of the plastic waste in the ocean comes from human activities on land. However, its pollution status in the terrestrial environment, especially soil, has not attracted enough attention. Microplastics in the soil will degrade and release various toxic and harmful additives. During the degradation process, they will also adsorb hydrophobic organic matter and heavy metals in the environment, posing a hazard to the soil ecosystem. Sources of microplastic pollution in soil include sewage, organic fertilizers, atmospheric deposition, and agricultural mulch residues. Among them, plastic mulch residues have become the...

Claims

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Application Information

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IPC IPC(8): G01N21/35G01N23/2251
CPCG01N21/35G01N23/2251G01N2021/3595G01N2223/071
Inventor 周瑛李若嘉柳一
Owner ZHEJIANG UNIV OF TECH
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