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Method for evaluating micro-plastic pollution level of marine sediments

A technology for marine sediments and pollution levels, applied in the field of risk assessment of marine pollutants, can solve the problems of no one to evaluate and compare the level of microplastic pollution, and achieve the effects of consistent collection time, good stability and accurate research results.

Active Publication Date: 2021-02-02
YELLOW SEA FISHERIES RES INST CHINESE ACAD OF FISHERIES SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the research on microplastics mainly focuses on the analysis of their environmental abundance and composition, but there is no relevant report on the diversity analysis of microplastics, and no one evaluates and compares the pollution level of microplastics.

Method used

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  • Method for evaluating micro-plastic pollution level of marine sediments
  • Method for evaluating micro-plastic pollution level of marine sediments
  • Method for evaluating micro-plastic pollution level of marine sediments

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A method for assessing the pollution level of microplastics in marine sediments, said method comprising the steps of:

[0025] (1) Microplastic collection: All samples were collected from the upper 10cm of the sediment at each station. Sediments were collected using grab mud extractors, transferred to aluminum foil sampling bags, and immediately stored in an ice-filled freezer until further analysis. Prior to sampling at each station, the grabs and associated sampling tools were thoroughly rinsed with ethanol and seawater. Three replicate samples were randomly collected at each site, and each sample had a mass of approximately 3 kg.

[0026] (2) Separation of microplastics: All sediment samples were carefully homogenized under a clean glass vessel, and dried at 60°C for at least 72 hours to obtain a constant weight. The abundance of microplastics was therefore determined from the dry weight of the sediment samples. 800 ml of saturated NaCl solution was stirred with 5...

Embodiment 2

[0033] In this example, two coastal bays (Laizhou Bay and Jinghai Bay) near the Shandong Peninsula were used to investigate the pollution level of microplastics. Laizhou Bay is located in the northern part of Shandong Peninsula, China. It is a large bay with a water area of ​​about 6000km 2 . The inflow of more than a dozen rivers, including the Yellow River, the second largest river in China, is surrounded by frequent human activities, including aquaculture, industry and tourism. Located in the east of Shandong Peninsula, Jinghai Bay is a small relatively closed bay with a water area of ​​about 140km 2 . Jinghai Bay is responsible for the discharge of domestic and industrial sewage from surrounding villages and towns in Weihai City. Its population and types of human activities are much smaller than those of cities around Laizhou Bay.

[0034] Describe in detail below.

[0035] A method for assessing the pollution level of microplastics in marine sediments, the specific st...

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Abstract

The invention relates to a method for evaluating the micro-plastic pollution level of marine sediments, and belongs to the field of risk evaluation of marine pollutants. Sea area sediments are taken as experimental objects, meanwhile, one-dimensional analysis of single abundance / component of an evaluation system is pushed to multi-dimensional (abundance, variety and diversity) comprehensive evaluation, overall response values of micro-plastic pollution in different investigation areas are compared, and the higher the overall response values of micro-plastic pollution are, the higher the pollution level of micro-plastic in the areas is. The method provided by the invention has good performance in estimating and comparing the micro-plastic pollution levels of sediments in different sea areas, and is good in result stability, high in repeatability and strong in comparability.

Description

technical field [0001] The invention belongs to the field of risk assessment of marine pollutants, and in particular relates to a method for assessing the pollution level of marine sediment microplastics. Background technique [0002] In recent decades, with the mass production and use of plastics, a large amount of plastic waste enters the ocean every year. Plastic waste is decomposed into microplastics after long-term weathering, high-temperature oxidation, and light. Microplastics usually refer to plastic particles or fibers with a diameter or length less than 5mm, which have the characteristics of low density, large specific surface area and strong hydrophobicity. At present, surveys show that microplastics have spread across the global ocean, from the equator to the poles, from the offshore to the ocean, from surface seawater to deep-sea sediments, and their abundance is still increasing year by year. On the one hand, marine microplastics cause harm to marine organism...

Claims

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Application Information

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IPC IPC(8): G01N15/00G01N15/10G01N21/35G06F16/2458G06Q10/06
CPCG01N15/00G01N15/10G01N21/35G01N2021/3595G06Q10/0635G06F16/2462
Inventor 孙雪梅夏斌陈碧鹃朱琳赵信国曲克明
Owner YELLOW SEA FISHERIES RES INST CHINESE ACAD OF FISHERIES SCI
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