Method for detecting content of microplastics in water body

Abstract

The invention discloses a method for detecting the content of microplastics in a water body. The method comprises the following steps: step a, firstly, scientifically sampling the water body with a direct selection method, a large sample method or a concentrated sample method, and then loading into a 500 ml solvent bottle; step b, manually removing impurities from the sampled water body; step c, processing a silver filter foil and then bending to form a cylindrical shape, selecting a stirring rod made of glass, and then completely seamlessly adhering the filter foil to the stirring rod in a manner of magnetron sputtering of an activated carbon powder material; step d, preparing a precipitate catalysis reaction solution, and then respectively pouring a prepared purified solution into the solvent bottle to be detected to perform sufficient reaction; and step e, filtering a suspension obtained in the step d with a nanoscale filter mesh, and then collecting the microplastics. The method provided by the invention enables the microplastics to float up based on a saturated stable solution, simplifies operation of separating the microplastics from the water body sample, has low detection costs, and provides a new idea for detection of microplastic environment pollution.

Description

technical field [0001] The invention relates to the technical field of environmental purification, in particular to a method for detecting the content of microplastics in water bodies. Background technique [0002] Microplastics are generally defined as: plastic pellets, microfibers, plastic granules, foam plastics or films with a size between 0.2-5.0mm, etc. Microplastics mainly include equipment damage and raw materials for sewage discharge, garbage dumps, offshore operations and ship transportation. Plastic granule raw materials brought into the natural environment by leakage, human activities in coastal areas, plastic debris formed by physical action of large pieces of plastic waste, particle additives in facial cleansers and other daily necessities, and industrial polishing materials, etc., enter the environment Due to their small particle size and low density, microplastics can migrate under external forces such as wind, rivers, and ocean currents. The properties of mi...

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Problems solved by technology

[0002] Microplastics are generally defined as: plastic pellets, microfibers, plastic granules, foam plastics or films with a size between 0.2-5.0mm, etc. Microplastics mainly include equipment damage and raw materials for sewage discharge, garbage dumps, offshore operations and ship transportation. Plastic granule raw materials brought into the natural environment by leakage, human activities in coastal areas, plastic debris formed by physical action of large pieces of plastic waste, particle additives in facial cleansers and other daily necessities, and industrial polishing materials, etc., enter the environment Due to their small particle size and low density, microplastics can migrate under external forces such as wind, rivers, and ocean currents. The properties of microplastics are relatively stable and can exist in the environment for a long time, but their surface physical and chemical properties will be affected by sunlight, wind, waves, etc. Changes under the action; microplastics are small in size, large in specific surface area, and strong in hydrophobicity. They are ideal carriers for many hydrophobic organic pollutants and heavy metals. Microplastics are easily eaten by plankton and fish, and can retain organisms for a long time. transfer and enrichment in the food web, posing a threat to the safety of the ecological environment

[0003] At present, there are still some deficiencies in the existing microplastic sampling methods. For example, due to the different sampling methods of the existing microplastic sampling methods, the concentration units of many research results are completely different, and it is difficult to horizontally compare microplastics in different regions. In addition, the recovery rate of different analysis methods in the sample pretreatment process is also different, resulting in large deviations in the results of the same sample analyzed by different methods

The problem of microplastic pollution is a global pollution problem. It has a wide range of distribution in water bodies and a small order of magnitude of concentration. The current detection method is relatively backward. In view of the above, a method for detecting the content of microplastics in water bodies is proposed here

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