A method, device and product for correcting the abundance of microplastics in water

Abstract

The invention discloses a correction method, equipment and product for the abundance of microplastics in water bodies, and relates to the field of microplastic monitoring technology. The method includes obtaining field measured data; establishing a microplastic "size-abundance" database according to the field measured data; fitting the microplastic "size-abundance" database, determining the correction factor of the abundance of microplastics, and obtaining the theoretical correction abundance of microplastics in different particle size ranges; obtaining the size correction factor of the corresponding initial particle size range using the measured microplastic abundance and the theoretical correction abundance; finally determining the full-size range (10-5000μm) microplastic abundance correction model through the theoretical correction abundance and the size correction factor under different initial particle size conditions; determining the full-size microplastic abundance according to the full-size range microplastic abundance correction model. The invention can provide a simple and reliable "correction ruler" for the research and evaluation of the abundance of microplastics in water bodies.

Description

Technical Field

[0001] The present invention relates to the technical field of microplastic monitoring, and in particular to a method, equipment and product for correcting the abundance of microplastics in water. Background Art

[0002] Microplastics refer to plastic debris or particles with a size of less than 5mm. They are formed after various plastic products in the environment age and break. They are widely found in water environments such as oceans, lakes, reservoirs and rivers, and are known as "PM2.5 in water environments". Microplastic pollution has become an urgent global ecological and environmental issue and research hotspot. China attaches great importance to the problem of microplastic pollution in freshwater environments and lists microplastics as one of the four new pollutants. However, the monitoring of microplastics in China's rivers, lakes and reservoirs is still in its early stages and there is still a lack of unified standard methods, which leads to the low utilization of existing monitoring data and the lack of comparability between data. Therefore, it is still impossible to clarify the abundance level of microplastics in China's surface waters, which affects the overall judgment of China's microplastic pollution situation. It can be seen that solving the impact of the size effect of microplastics on abundance in water bodies is the key to improving the utilization and comparability of existing data.

[0003] At present, mathematical models have been used to correct the abundance of microplastics, but this method is still based on previously published data information rather than fitting modeling based on measured results, which leads to a significant overestimation of the correction results of microplastic abundance.

[0004] Therefore, how to improve the accuracy of microplastic abundance correction results remains a pressing problem to be solved. Summary of the invention

[0005] The purpose of the present invention is to provide a method, device and product for correcting the abundance of microplastics in water bodies, which can improve the accuracy of the correction results of the microplastic abundance.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A method for correcting the abundance of microplastics in water, the method comprising:

[0008] Obtaining field measured data; the field measured data includes: the number of microplastic particles, microplastic abundance, particle size and polymer type;

[0009] Establish a microplastic "size-abundance" database based on field measured data; the microplastic "size-abundance" database contains measured data on the abundance of microplastics corresponding to different starting particle size ranges in water bodies;

[0010] Fit the microplastic "size-abundance" database, determine the microplastic abundance correction factor based on the measured microplastic abundance data, and further obtain the theoretical corrected abundance of microplastics in different starting particle size ranges;

[0011] The size factor correction was performed using the theoretically corrected abundance of microplastics in different starting particle size ranges and the corresponding measured abundance of microplastics;

[0012] According to the corrected size factors corresponding to different starting particle size ranges of microplastics, the corrected size-abundance correction model of microplastics in the full size range was obtained;

[0013] The abundance of microplastics in the full size range was determined based on the corrected full size range microplastic size-abundance correction model.

[0014] Optionally, the microplastic "size-abundance" database is fitted to determine the microplastic abundance correction factor based on the measured microplastic abundance data, and further obtain the theoretical corrected abundance of microplastics in different starting particle size ranges, specifically including:

[0015] log(y)=log(b)-αlog(x)'

[0016]

[0017] Among them, y is the abundance of microplastics, x is the particle size, a and b are fitting parameters, CF is the correction factor, and x 2D is the maximum particle size after correction, μm, x 1D is the minimum particle size after correction, μm, x 1M is the minimum particle size actually measured, μm, x 2M is the maximum particle size actually measured, μm.

[0018] Optionally, the size factor correction is performed using the theoretically corrected abundance of microplastics in different starting particle size ranges and the corresponding measured abundance of microplastics, specifically comprising:

[0019] CA1 = abundance of microplastics in different initial particle size ranges × CF;

[0020] Among them, CA1 is the theoretical corrected abundance of microplastics in different starting particle size ranges after size factor correction, in particles / m 3 .

[0021] Optionally, the corrected full-size range microplastic size-abundance correction model is:

[0022]

[0023] Optionally, the abundance of microplastics in the full size range is:

[0024] CA2 = abundance of microplastics in different initial particle size ranges × CF × CR;

[0025] Among them, CA2 is the abundance of full-size microplastics, in particles / m 3 .

[0026] A computer device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method.

[0027] A computer program product comprises a computer program, which implements the steps of the method when executed by a processor.

[0028] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0029] The present invention provides a method, device and product for correcting the abundance of microplastics in water bodies. A microplastic "size-abundance" database is established based on field measured data, and then a correction factor is determined; then the theoretical corrected abundance of microplastics in different starting particle size ranges is obtained based on the correction factor, so as to further obtain a size-abundance correction model based on the theoretical corrected abundance of microplastics in different starting particle size ranges and their corresponding measured microplastic abundances; the present invention establishes a full-size range microplastic abundance correction model based on field measured data, which can improve the accuracy and comparability of the microplastic abundance correction results. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0031] Figure 1 A schematic diagram of a flow chart of a method for correcting the abundance of microplastics in water provided by the present invention;

[0032] Figure 2 Schematic diagram of the correction model for microplastic abundance in the full size range;

[0033] Figure 3 Schematic diagram of the corrected abundance distribution in each basin. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The purpose of the present invention is to provide a method, device and product for correcting the abundance of microplastics in water bodies, which can improve the accuracy and comparability of the correction results of the microplastic abundance.

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] like Figure 1 As shown, the present invention provides a method for correcting the abundance of microplastics in water, the method comprising:

[0038] S101, obtaining field measured data; the field measured data includes: the number of microplastic particles, the abundance of microplastics, the particle size and the polymer type;

[0039] S102, establishing a microplastic "size-abundance" database based on field measured data; the microplastic "size-abundance" database includes measured data on the abundance of microplastics corresponding to different starting particle size ranges in water bodies;

[0040] S103, fitting the microplastic "size-abundance" database, determining the microplastic abundance correction factor based on the measured microplastic abundance data, and further obtaining the theoretical corrected abundance of microplastics in different starting particle size ranges;

[0041] S103 specifically includes:

[0042] log(y)=log(b)-alog(x)'

[0043]

[0044] Among them, y is the abundance of microplastics, x is the particle size, a and b are fitting parameters, CF is the correction factor, and x 2D is the maximum particle size after correction, μm, x 1D is the minimum particle size after correction, μm, x 1M is the minimum particle size actually measured, μm, x 2M is the maximum particle size actually measured, μm.

[0045] S104, size factor correction is performed using the theoretically corrected abundance of microplastics in different starting particle size ranges and the corresponding measured abundance of microplastics;

[0046] S104 specifically includes:

[0047] CA1 = abundance of microplastics in different initial particle size ranges × CF;

[0048] Among them, CA1 is the theoretical corrected abundance of microplastics in different starting particle size ranges after size factor correction, in particles / m 3 .

[0049] S105, obtaining a corrected size-abundance correction model for microplastics in the full size range according to the corrected size factors corresponding to different starting particle size ranges of microplastics;

[0050] like Figure 2 As shown, the full-size range microplastic abundance correction model is:

[0051]

[0052] S106, determining the abundance of microplastics in the full size range based on the corrected full size range microplastic size-abundance correction model.

[0053] The full-size microplastic abundance is: CA2 = abundance of microplastics in different initial particle size ranges × CF × CR;

[0054] Among them, CA2 is the abundance of full-size microplastics, in particles / m 3 .

[0055] Through the above steps, the abundance of microplastics with different initial particle sizes can be corrected to the abundance of full-size microplastics (10-5000μm), thereby unifying the particle size range of microplastics and making it possible to compare the published data on the abundance of microplastics in China's surface water, thereby obtaining more accurate microplastic occurrence characteristics and providing technical support for the formulation of control policies for microplastics in China's surface water.

[0056] For the present invention, six actual surface water samples were collected for method validation, and the recovery rate was (86.0±29.8)%, which met the accuracy requirements of the method and can be used for correction of published data.

[0057] Through Web of Science, we searched for relevant articles reporting on the abundance of microplastics in China's freshwater environment using the keywords "lakes", "reservoirs" and "rivers" and manually screened them. The screening principle was to use a unified unit of particles / m 3, sampling large volume sampling and sieving methods to obtain microplastic samples, and using spectral equipment for microplastic identification. A total of 57 articles and 1,331 sampling point information were obtained. The abundance of all-size microplastics was corrected for these reported data, and the abundance distribution characteristics of microplastics in freshwater in China were obtained for the first time. Figure 3 shown.

[0058] In one embodiment, a computer device is provided, which may be a database. The computer device includes a processor, a memory, an input / output interface (I / O for short) and a communication interface. The processor, the memory and the input / output interface are connected via a system bus, and the communication interface is connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store pending transactions. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a data processing method is implemented.

[0059] In one embodiment, a computer device is also provided, including a memory and a processor to store a computer program in the memory and run on the processor, and the processor implements the steps in the above method embodiments when executing the computer program.

[0060] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0061] It should be noted that the object information (including but not limited to object device information, object personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the object or fully authorized by all parties, and the collection, use and processing of relevant data need to comply with relevant laws, regulations and standards of relevant countries and regions.

[0062] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited thereto.

[0063] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for correcting the abundance of microplastics in water, characterized in that: The method comprises: Obtaining field measured data; the field measured data includes: the number of microplastic particles, microplastic abundance, particle size and polymer type; Establish a microplastic "size-abundance" database based on field measured data; the microplastic "size-abundance" database contains measured data on the abundance of microplastics corresponding to different starting particle size ranges in water bodies; Fit the microplastic "size-abundance" database, determine the microplastic abundance correction factor based on the measured microplastic abundance data, and further obtain the theoretical corrected abundance of microplastics in different starting particle size ranges; The size factor correction was performed using the theoretically corrected abundance of microplastics in different starting particle size ranges and the corresponding measured abundance of microplastics; According to the corrected size factors corresponding to different starting particle size ranges of microplastics, the corrected size-abundance correction model of microplastics in the full size range was obtained; The abundance of microplastics in the full size range was determined based on the corrected full size range microplastic size-abundance correction model; The microplastic "size-abundance" database is fitted to determine the microplastic abundance correction factor based on the measured microplastic abundance data, and further obtain the theoretical corrected abundance of microplastics in different starting particle size ranges, specifically including: ； ； in, is the abundance of microplastics, is the particle size, and is the fitting parameter, is the correction factor, is the maximum particle size after correction, μm, is the minimum particle size after correction, μm, is the minimum particle size actually measured, μm, is the maximum particle size actually measured, μm; The size factor correction is performed using the theoretically corrected abundance of microplastics in different starting particle size ranges and the corresponding measured abundance of microplastics, specifically comprising: CA1=abundance of microplastics in different initial particle size ranges×CF; Among them, CA1 is the theoretical corrected abundance of microplastics in different starting particle size ranges after size factor correction, in particles / m 3 ; The corrected full-size range microplastic size-abundance correction model is: ； The abundance of microplastics in the full size range is: CA2=abundance of microplastics in different initial particle size ranges×CF×CR; Among them, CA2 is the abundance of full-size microplastics, in particles / m 3 .

2. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method described in claim 1.

3. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method described in claim 1 are implemented.

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