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Microplastic sampling column, microplastic collection device and in-situ digestion method

A collection device and microplastics technology, applied in the field of microplastics collection device, in-situ digestion, and microplastics sampling column, can solve problems such as fluctuations in the total amount of microplastics, save pre-processing time, reduce errors, ensure reliability and The effect of accuracy

Pending Publication Date: 2019-03-22
蔡明红
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The concentration of larger particles of microplastics (300μm-5mm) in seawater is low. According to existing reports, the concentration of microplastics in China's coastal waters is 0.167±0.138n / m 3 (Zhao et al., 2014, Marine Pollution Bulletin, 86, 562-568), using the trawling method to collect microplastics, microplastics are easily adsorbed on the walls of nylon mesh, but not enriched on plankton nets, because microplastics in seawater The total amount is small, and even individual errors may cause large fluctuations in the total amount of microplastics

Method used

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  • Microplastic sampling column, microplastic collection device and in-situ digestion method
  • Microplastic sampling column, microplastic collection device and in-situ digestion method
  • Microplastic sampling column, microplastic collection device and in-situ digestion method

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Experimental program
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Effect test

Embodiment 1

[0041] The specific parameters for collecting water samples are: seawater in a certain sea area; sampling time: 100min; water collection volume: 1.630m 3 . The sample collected this time is recorded as ES01.

[0042] Separating the microplastics in the collected ES01 samples from other impurities is a crucial step in the analysis and identification of microplastics. Therefore, it is necessary to perform in-situ digestion treatment on the microplastic sampling column 1 enriched with seawater microplastic samples. Seawater contains organic matter such as algae, which need to be removed before identification of microplastics. In the in-situ digestion method based on the microplastic sampling column in the embodiment of the present invention, a stainless steel casing (with a matching stainless steel cover) is used as the digestion device, and the diameter and height of the selected stainless steel casing are slightly larger than the main column 11 in diameter and height.

[00...

Embodiment 2

[0056] The specific parameters for collecting water samples are: tap water in a laboratory, the volume of collected water is 50L, and the sample collected this time is recorded as ES02.

[0057] Inject tap water into the experimental pool, add a little polypropylene (PP) particles with a diameter of about 100 μm, use the microplastic collection device to collect the microplastic particles in the experimental pool, and select the aperture of the filter sheet 15 to be 20 μm. Because tap water basically does not contain organic matters such as algae, it does not need digestion treatment, and in this embodiment, the digestion step can be omitted.

[0058] After sampling, the filter sheet 15 in the main column 11 was removed, placed in an oven at 45° C. for drying, and then analyzed and identified directly.

[0059] Raman spectrometer (LabRAM XploRA PLUS) was used for instrument identification, the excitation wavelengths were 532nm and 785nm, and the objective lens: 50×LWD. As a f...

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Abstract

The invention discloses a microplastic sampling column, which comprises a main column, a filter screen, an upper end cap, and a lower end cap, wherein the upper end cap and the lower end cap are detachably connected to the top and bottom of the main column, forming a cylindrical cavity, and the filter screen is arranged on the bottom of the cavity. A microplastic collection device comprises the microplastic sampling column, a surface water sampler, a suction pump, a flowmeter, a changeover valve, and an electric control system. Microplastic can be collected at large flow by the microplastic collection device. According to an in-situ digestion method for microplastic collection, the main column which finishes sampling is put into a sleeve, an oxidant solution is added, the sleeve is sealedby a sleeve cover, and after standing, washing and drying, the microplastic can be identified. Compared with the prior art, the invention can effectively enrich the microplastic in water, and comparedwith conventional methods, the invention increases the precision of microplastic detection by one to two orders of magnitude; the in-situ digestion method does not need to transfer enriched sample out first, consequently, errors are reduced, and the time of pretreatment is shortened.

Description

technical field [0001] The application belongs to the field of water body detection, and in particular relates to a microplastic sampling column, a microplastic collection device and an in-situ digestion method for collecting and in-situ digestion of microplastics in a water body. Background technique [0002] Microplastic refers to the general term for various plastic pellets, microfibers, plastic particles, foamed plastics and films with a size less than 5.0 mm. The sources of microplastics in the marine environment are very complex, including input from land sources such as rivers, sewage discharges, and garbage dumps, as well as marine input from offshore operations and ship transportation. At the same time, industrial products such as some detergents, daily skin care products, and industrial raw materials also contain a large amount of microplastics. Microplastics entering the environment can migrate under external forces such as wind, rivers, and ocean currents due to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/14G01N1/40
CPCG01N1/14G01N1/4044
Inventor 蔡明红
Owner 蔡明红
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