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Method for extracting, separating and purifying micro-plastics in soil

A technology of microplastics and soil, applied in the field of soil chemical analysis, can solve the problems of insufficient extraction, high extraction efficiency of sandy soil samples, low efficiency of clay and loam soil, etc., achieve small particle size, rich humus content, strong adsorption Effect

Pending Publication Date: 2021-07-23
BEIJING CENT FOR PHYSICAL & CHEM ANALYSIS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Studies have shown that when the current soil microplastic extraction and separation methods are used to extract microplastics in soils with different textures, the extraction efficiency and recovery rate of microplastics are found to be unstable. full

Method used

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  • Method for extracting, separating and purifying micro-plastics in soil
  • Method for extracting, separating and purifying micro-plastics in soil
  • Method for extracting, separating and purifying micro-plastics in soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Step 1. Soil sample pretreatment

[0056] Soil samples are classified according to texture, divided into sandy soil, loamy soil and clay; remove large particles of impurities, such as crushed stones, plant roots, etc. in the sample, and then sieve, with a sieve aperture of 5.0 mm to remove plastic particles larger than 5 mm and other impurities to obtain pretreated soil samples.

[0057] Carbonate and organic matter in the pretreated soil samples were measured, the results are as follows:

[0058] Carbonate:

[0059] Carbonate in sand is 0.065g / 100g, so CO 3 2- 0.004g / 100g;

[0060] Carbonate in loam is 0.131g / 100g, so CO 3 2- 0.008g / 100g;

[0061] Carbonate in clay is 0.128g / 100g, so CO 3 2- It is 0.0078g / 100g.

[0062] Organic matter:

[0063] 100g of sand contains 0.50g of organic matter,

[0064] 100g of loam soil contains 2.82g of organic matter,

[0065] 100g of clay contains 3.63g of organic matter.

[0066] Step 2. Extraction and separation of soil...

Embodiment 2

[0080] Step 1. Soil sample pretreatment

[0081] Same as Step 1 of Example 1.

[0082] Step 2. Extraction and separation of soil microplastics

[0083] (1) Put 50.0g of the pretreated soil sample in a 500mL beaker, add saturated ZnCl 2 Aqueous solution 200mL dissolves, makes soil suspension solution, adds hydrochloric acid while stirring, and hydrochloric acid add-on is as follows:

[0084] Add 0.5mL to the sand sample, add 1.0mL to the loam sample, and add 1.0mL to the clay sample.

[0085] Others are the same as in Example 1 and Step 2 (1) is the same.

[0086] (2) Ultrasound and shake for 2 minutes to shake evenly, let stand for stratification, and filter the supernatant after stratification; repeat this step 3 times to obtain samples from which soil microplastics have been extracted.

[0087] The ultrasonic power is 600W, and the frequency is 40KHz. The ultrasonic time of sand, clay and loam is shown in Table 2.

[0088] Static layering time, the static layering time ...

Embodiment 3

[0095] Step 1. Soil sample pretreatment

[0096] Same as Step 1 of Example 1.

[0097] Step 2. Extraction and separation of soil microplastics

[0098] (1) with embodiment 2 step two (1);

[0099] (2) With embodiment 1 step two (1).

[0100] Step 3. Purification of microplastics

[0101] Into samples from which soil microplastics were extracted:

[0102] Sandy soil: add 2mol / L FeSO 4 Solution 2mL and mass fraction of 30% H2 o 2 Solution 5mL (as shown in Table 3), H 2 o 2 with Fe 2+ The molar ratio is 10:1, the H in the hydrogen peroxide solution 2 o 2 With the mass ratio between described organic matter is 5:1;

[0103] Add 2mol / L FeSO 4 Solution 3mL and mass fraction of 30% H 2 o 2 Solution 10mL (as shown in Table 3), H 2 o 2 with Fe 2+ The molar ratio is 15:1, the H in the hydrogen peroxide solution 2 o 2 The mass ratio with the organic matter is 10:1;

[0104] Clay: add 2mol / L FeSO 4 Solution 13mL and mass fraction of 30% H 2 o 2 Solution 30mL (as sho...

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Abstract

The invention relates to a method for extracting, separating and purifying micro-plastics in soil, and belongs to the technical field of soil chemical analysis. According to the method, analyzed soil samples are classified according to the difference of soil textures, namely sandy soil, loam and clay, and different extraction and separation methods are adopted for samples of different soil types; in order to promote dissolution of some mineral components in the soil and reduce coagulation of soil particles, and hydrochloric acid is added into a saturated zinc chloride suspension; the soil suspension is subjected to ultrasonic treatment and oscillation, the soil aggregate structure is broken, and separation of micro-plastics and impurity components is promoted; and after the suspension is subjected to static layering and separation, a sample is subjected to a Fenton reaction, and soil organic matter interference is removed.

Description

technical field [0001] The invention relates to a method for extracting, separating and purifying microplastics in soil, and belongs to the technical field of soil chemical analysis. Background technique [0002] Soil is a vital natural resource to ensure the sustainable development of agriculture in our country, and an important object of ecological and environmental protection. However, with the rapid development of my country's industrialization, the problems of soil pollution and soil quality decline are becoming increasingly serious. Among the many soil pollutants, microplastics with a diameter of less than 5 mm have become a new type of pollutant, and the pollution problems caused by them have attracted more and more attention. Microplastics in the soil mainly enter through the extensive use of agricultural film and the recycling of plastic-containing waste, and continue to accumulate in the soil, affecting soil properties, soil functions and soil biodiversity. There...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/34G01N21/3563
CPCG01N1/28G01N1/34G01N21/3563Y02W30/62
Inventor 汤庆峰高峡
Owner BEIJING CENT FOR PHYSICAL & CHEM ANALYSIS
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