Separation method of submicron microplastic at water environment or in marine products
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A submicron-level separation method technology, applied in the field of submicron-level microplastic separation, can solve the problems of incomplete separation of plastics and interference in real sample analysis, and achieve less loss of plastic particles, low cost, and easy acquisition Effect
Active Publication Date: 2018-09-28
ZHEJIANG UNIV OF TECH +1
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These separation methods are only suitable for the separation of plastics larger than 40 microns, and cannot completely separate the
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Embodiment 1
[0030] Example 1 Separation of microplastics in seafood prawns
[0031] (1) Weigh 0.336g of freeze-dried prawns in a beaker, add 0.0286g of microplastic standard PVC with a particle size of less than 20μm in the prawns as an internal standard, then add 8mL of nitric acid into the beaker, and then place the beaker Heat on a heating plate at 50°C for 20 minutes, remove the beaker to cool, add 1 mL of hydrogen peroxide, and digest under the same conditions for 15 minutes. After the sample is completely digested, remove the beaker, cool to room temperature, and add 150 mL of water to the reaction solution. Dilute to obtain a digest solution.
[0032] (2) Add 0.05g sodium lauryl sulfate to the obtained digestion solution (159mL), disperse evenly by ultrasonic (70Hz, 1-2min), let stand for 15min and then divide into suspension layer, solution layer and precipitation layer from top to bottom 3 layers, remove the middle solution layer by siphon, and collect the residue; after taking ...
Embodiment 2
[0042] Example 2 Separation of Microplastics in Water Environment
[0043] Taking the water sample from the Shangtang River in Hangzhou, Zhejiang as the test sample, the separation process is as follows:
[0044](1) Take a 150mL water sample, add 0.031g of microplastic standard PVC with a particle size of less than 20μm as an internal standard in the water sample, then add 0.04g of sodium lauryl sulfate, and disperse evenly by ultrasonic (70Hz, 1-2min) After standing for 15 minutes, it is divided into three layers from top to bottom: suspension layer, solution layer and precipitation layer. Remove the middle solution layer by siphon and collect the residue; take the middle solution layer sucked by siphon and let it stand for 15 minutes. And the bottom is divided into 3 layers, continue to remove the middle layer by siphon, and merge the residue with the previous collection;
[0045] When removing the middle solution layer by siphon, be careful not to remove it completely, so ...
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Abstract
The invention discloses a separation method of submicron microplastic at water environment or in marine products. The separation method comprises following steps: sodium dodecyl sulfate is added intoa sample liquid for uniform ultrasonic dispersion, an obtained mixture is allowed to stand so as to obtain three layers including a suspension layer, a solution layer, and a precipitation layer from top to bottom, the middle solution layer is removed through siphoning, and a leftover is collected; 2 to 3 volume times of absolute ethyl alcohol is added into the leftover, ultrasonic treatment is carried out, an obtained product is allowed to standing so as to obtain two layers, an upper solution layer is removed through siphoning, and a lower layer substance is collected; the collected lower layer substance is introduced into a flat bottom vessel, 1 to 3 volume times of absolute ethyl alcohol is added for uniform mixing, an obtained mixed material is allowed to standing so as to obtain two layers, an obtained upper layer liquid is removed via suction, and at last natural air drying is carried out so as to obtain the submicron microplastic in the sample liquid through separation. The separation method can be used for rapid, accurate separation extraction of submicron microplastic particles in samples; pumping filtration, centrifugation, or drying is not needed; operation is simple; cost is low; and technology support is provided for subsequent accurate quantitative determination.
Description
(1) Technical field [0001] The invention relates to a method for separating microplastics, in particular to a method for separating submicron microplastics in water environment or seafood. (2) Technical background [0002] The ocean is an important part of human survival and development. Studies have found that there are more than 5 trillion pieces of plastic floating in the sea around the world, weighing up to 250,000 tons. These plastic fragments are broken into fine particles through physical, chemical and biological processes, and are currently becoming an important source of marine environmental pollution. A large number of studies have proved that microplastics are threatening the survival of marine life, and have been proved by different marine species, which means that microplastics will accumulate in the marine food chain, affecting food safety and human health. At present, the pollution of microplastics in seafood is not regulated at home and abroad, but European...
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