In-situ water body micro-plastic graded sampling system

Abstract

The invention relates to an in-situ water body micro-plastic graded sampling system. The system comprises a water supply pump with a water inlet and a water outlet, a flowmeter and a buffer barrel; the water inlet of the water supply pump is used for introducing seawater, and the water outlet of the water supply pump is connected with a buffer barrel; the flowmeter is arranged between the water supply pump and the buffer barrel, one end is connected with a water outlet of the water supply pump, and the other end is connected with the buffer barrel; and the buffer barrel is provided with a water inlet and a water outlet, the water inlet of the buffer barrel is connected with the flow meter, and the water outlet of the buffer barrel is connected with at least two filters which are arranged in sequence. The sampling system disclosed by the invention is convenient and simple in micro-plastic collection. Moreover, the micro-plastic is intercepted in a relatively closed environment through the filter, so that the sample is prevented from being contaminated, and a reliable basis is provided for subsequent accurate analysis of the micro-plastic.

Description

technical field [0001] The invention relates to the technical field of marine environment detection, in particular to an in-situ water body microplastic graded sampling system. Background technique [0002] Microplastics are plastic fragments and particles smaller than 5mm in diameter. In fact, the particle size of microplastics ranges from a few microns to several millimeters. It is a mixture of heterogeneous plastic particles in various shapes, which are often difficult to distinguish with the naked eye. They are vividly called "PM2.5 in the sea". When microplastics are accidentally eaten by plankton and fish, they can stay in organisms for a long time, transfer and enrich in the food web, and eventually be eaten by humans through the food chain, seriously affecting the marine ecosystem and human health. The abundance of microplastics in seawater samples is low, and generally requires pretreatment methods such as concentration and enrichment to be detected. [0003] At p...

AI Technical Summary

Problems solved by technology

Collecting a large number of water samples to the laboratory for filtration analysis requires collecting and transporting a large number of water samples, which increases unnecessary transportation costs

However, sampling by horizontal trawling has a large error in the depth of the sampling water layer, making it difficult to study the profile distribution of microplastics; in addition, during the trawling process, it is easily affected by wind waves and waves generated by hull navigation, and the net gear is easy to be damaged and tilted. The accuracy of the flowmeter at the network port is poor, resulting in unstable water intake at the network port, large deviations in the volume of the trawl water body, and inaccurate calculation results

The size of the commonly used sampling net is large, and the microplastic samples are easy to adhere to the net or sieve, which will easily lead to unclean washing and serious sample residue, which directly affects the quantitative analysis of the sample.

In addition, for microplastic samples of different particle sizes, it is necessary to replace the nets with different meshes and trawl the net many times, resulting in poor uniformity of graded samples and waste of manpower and material resources

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