Method for separating microplastics from sediments rich in organic matters
A sediment and organic matter technology, applied in the field of environmental engineering, can solve the problem of unsatisfactory separation of microplastics, achieve efficient and reliable digestion capacity, good separation of microplastics, easy standardization and combined with instrument detection
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Embodiment 1
[0053] This embodiment provides a method for separating microplastics from organic-rich sediments, including the following steps:
[0054] 1) Sample collection and pretreatment: samples were collected within 300m west of Fengtang River Estuary in Futian Mangrove, and the surface sediments at the high tide level in the mangrove were collected. The thickness of the collection was 10cm, and the collection volume was 20kg; Dry in an oven at ℃ for 3 days, grind, pass through a 4 mesh (ie 4.75mm) sieve, and take the sediment powder under the sieve;
[0055] 2) Extraction of microplastics: put 5.00 g of the sediment powder obtained in step 1) into a 50 ml centrifuge tube, add 45 ml of acidified zinc chloride (the acidified zinc chloride is a mixed solution containing sulfuric acid and zinc chloride) in the centrifuge tube , wherein the concentration of sulfuric acid is 0.368mol / L, and the density of the acidified zinc chloride is 1.6g / ml), shake horizontally at 120rpm for 1h, then le...
Embodiment 2
[0074] This embodiment provides a method for separating microplastics from organic-rich sediments, including the following steps:
[0075] 1) Sample collection and pretreatment: The samples were collected within 300m west of the Fengtang River Estuary in Futian Mangrove, and the surface sediments of the high tide level inside the mangrove forest and the low tide level outside the mangrove forest were collected respectively, with a thickness of 10cm; The main difference is the content of plant detritus impurities. The content of high tide level sediments in mangroves is 10.14±1.86% (w / w), and the content of low tide level sediments outside mangroves is 0.41±0.08% (w / w w); two kinds of sediments are collected in 3 parallel samples, each parallel sample collection volume is 10kg, and the interval between parallel sample collection points is 3-5m; the collected two kinds of mangrove sediments are respectively placed in a 60°C oven to dry 3 days, grind, cross 4 meshes (being 4.75mm...
Embodiment 3
[0099] This embodiment provides a method for separating microplastics from organic-rich sediments, including the following steps:
[0100] 1) Sample collection and pretreatment: The samples in this example were collected at 500m west of the mouth of the Fengtang River in the mangrove forest in Futian, in a direction perpendicular to the coastline, at five tide levels from the high tide level along the coast in the mangrove forest to the low tide level light beach in the mangrove forest. The surface sediments were collected at a thickness of 10 cm. The specific sampling tidal levels include: high tide level along the coast in the mangrove (T1), central part of the mangrove (T2), edge of the mangrove forest (T3), light beach 50m outside the mangrove (T4 ), the light beach (T5) 100m outside the mangrove forest, the spatial distance between each tide level is about 50m, and the collection amount of each tide level is 1kg; the collected sediments are dried in a 60°C oven for 3 days,...
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Abstract
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