Method for detecting density distribution of micro-plastics in water environment sediments

A technology of density distribution and sediments, applied in particle and sedimentation analysis, preparation of test samples, measurement devices, etc., can solve the problems of polymer structure damage, damage, misjudgment, etc., to improve accuracy and precision high effect

Active Publication Date: 2019-01-18
GUILIN UNIVERSITY OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using a single stereo microscope or fluorescence microscope to identify the components of microplastics usually leads to misjudgment; pyrolysis-gas phase-mass spectrometry will destroy the structure of polymers and require high experimental conditions
Micro-Fourier spectroscopy, micro-Raman spectroscopy, scanning electron microscopy-energy dispersive X-ray technology and other non-destructive techniques are also applied to the identification of microplastics, but the shortcomings of these methods need to be improved, such as pyrolysis - Gas chromatography-mass spectrometer will cause damage to the measured sample and is not suitable for further analysis

Method used

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  • Method for detecting density distribution of micro-plastics in water environment sediments
  • Method for detecting density distribution of micro-plastics in water environment sediments
  • Method for detecting density distribution of micro-plastics in water environment sediments

Examples

Experimental program
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Effect test

Embodiment 1

[0063] Example 1:

[0064] (1) Select a sediment sample from the South Yellow Sea, place it in a clean beaker and dry it at 65°C to constant weight, and record the dry weight of the sediment;

[0065] (2) Take by weighing 100 g of the dry weight sediment sample and place it in a beaker, according to the weight of the sediment, add 100 mL of hydrogen peroxide solution with a mass fraction of 30%, and add in portions;

[0066] (3) Place the beaker on a magnetic stirrer for digestion at room temperature, and stir for 2 minutes until the sediment sample is completely digested;

[0067] (4) Add 1.2g / cm2 to the sediment after digestion and drying 3 NaCl and 1.55g / cm 3 KI solution was subjected to density flotation respectively;

[0068] (5) Vacuum filter the flotation heavy liquid, pass through the membrane, and dry at room temperature for 24 hours. Through the microscope inspection of the filter, the suspected particles are picked for microscopic-Fourier transform infrared spect...

Embodiment 2

[0080] (1) Select a sediment sample from the East China Sea, dry and weigh it in a clean beaker, and record the dry weight of the sediment;

[0081] (2) Take by weighing 100 g of the dry weight sediment sample and place it in a beaker, according to the weight of the sediment, add 100 mL of hydrogen peroxide solution with a mass fraction of 30%, and add in portions;

[0082] (3) Place the beaker on a magnetic stirrer for digestion at room temperature, and stir for 2 minutes until the sediment sample is completely digested;

[0083] (4) Add 1.2g / cm2 to the sediment after digestion and drying 3 NaCl and 1.55g / cm 3 KI solution was subjected to density flotation respectively;

[0084] (5) Vacuum filter the flotation heavy liquid, pass through the membrane, and dry at room temperature for 24 hours. Through the microscope inspection of the filter, the suspected particles are picked for microscopic-Fourier transform infrared spectroscopy and other analysis, and the microplastic part...

Embodiment 3

[0091] (1) Select sediment samples from tidal aquaculture areas, place them in a clean beaker, dry and weigh them, and record the dry weight of the sediments;

[0092] (2) Take by weighing 100 g of the dry weight sediment sample and place it in a beaker, according to the weight of the sediment, add 100 mL of hydrogen peroxide solution with a mass fraction of 30%, and add in portions;

[0093] (3) Place the beaker on a magnetic stirrer for digestion at room temperature, and stir for 2 minutes until the sediment sample is completely digested;

[0094] (4) Add 1.2g / cm2 to the sediment after digestion and drying 3 NaCl and 1.55g / cm 3 KI solution was subjected to density flotation respectively;

[0095] (5) Vacuum filter the flotation heavy liquid, pass through the membrane, and dry at room temperature for 24 hours. Through the microscope inspection of the filter, the suspected particles are picked for microscopic-Fourier transform infrared spectroscopy and other analysis, and th...

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Abstract

The invention provides a method for detecting density distribution of micro-plastics in marine sediments, belongs to the field of detecting micro-plastics in sediment samples. The invention provides amethod for detecting density distribution of micro-plastics in water environment sediments. The invention remedies the limitations of single flotation fluid on the separation type of microplastics and the cost of pretreatment for high density flotation by using 0.9 to 1.2 g/cm3 of NaCl and 1.20 to 1.55 g/cm3 of KI solution to perform a flotation processing on samples separately, and can separatehigh density microplastics; The invention visually detects suspected micro-plastic particles through a microscope, and then performs a micro-Fourier infrared analysis to improve the accuracy of singleidentification. The calculation of the density distribution of microplastics is highly accurate and simple, and can be applied to the study of density distribution characteristics in a variety of water environment sediments.

Description

technical field [0001] The invention belongs to the field of detecting microplastics in sediment samples, and in particular relates to a method for detecting the density distribution of microplastics in marine sediments. Background technique [0002] The emergence of plastics has had a profound impact on people's lifestyles, and the output of plastics has also increased year by year. Currently, an estimated 2.5 billion tons of plastic are in use in the global market; meanwhile, from 1950-2015, 6.3 billion tons of primary plastics were produced and the resulting plastic waste. Plastic waste is difficult to degrade naturally in the environment, and will gradually decompose into particles with a particle size of less than 5mm through physical, chemical and biological effects. Generally, plastic particles with a particle size of less than 5 mm are defined as microplastics (Microplastics). Microplastics have the characteristics of small particle size, strong hydrophobicity, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/10G01N1/28G01N1/34
CPCG01N1/28G01N1/34G01N15/10G01N2015/105
Inventor 李艳红崔耀宗章春芳张立浩朱义年解庆林张冬冬周航海
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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