Rapid detection method for content of micro-plastics in water body and application

A technology for quantitative detection of microplastics, applied in the field of environmental pollutant detection, can solve the problems of overlapping phase change signals and the inability to identify other types of plastics, and achieve the effects of reducing interference, avoiding quality loss, and improving accuracy

Active Publication Date: 2020-07-31
MARINE FISHERIES RES INST OF ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some of these technologies have been developed for the analysis of microplastics detection, such as differential scanning calorimetry (DSC) combined with TGA can identify PE and PP in the environment, but cannot identify other types of plastics because of their relative variable signal overlap

Method used

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  • Rapid detection method for content of micro-plastics in water body and application
  • Rapid detection method for content of micro-plastics in water body and application
  • Rapid detection method for content of micro-plastics in water body and application

Examples

Experimental program
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Embodiment 1

[0035] A digestion solution for separating microplastics, including 11g / L potassium hydroxide, 0.6g / L sulfathiazole sodium and 0.3g / L naphthaleneacetamide.

[0036] A method for separating microplastics in water samples, comprising:

[0037] Collection of water samples: In September 2019, seawater samples were collected in the Dongji Island aquaculture area, and the sampling point was selected from the Dongji Miaozi Lake aquaculture area. The seawater was manually collected using a glass water collector with a scale, and about 5L of seawater was collected. The seawater was concentrated to 1L with a 25μm screen on site, and transferred to a brown glass bottle for dark storage and brought back as soon as possible. Shake well in a sealed state, filter the water sample, rinse the filtered filter membrane with 300mL of the digestion solution prepared in this example (the prepared digestion solution is used after filtering with a 1 μm glass microfiber filter membrane), and place the...

Embodiment 2

[0039] A digestion solution for separating microplastics, including 11g / L potassium hydroxide and 0.6g / L sulfathiazole sodium. All the other parts are completely consistent with Example 1.

Embodiment 3

[0041] A digestion solution for separating microplastics, including 11g / L potassium hydroxide and 0.3g / L naphthaleneacetamide. All the other parts are completely consistent with Example 1.

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Abstract

The invention provides a rapid detection method for the content of micro-plastics in a water body and application, and belongs to the field of environmental pollutant detection. The invention discloses a digestion solution for separating micro-plastics in a water body sample. The digestion solution comprises 10-13 g/L of potassium hydroxide, 0.4-0.8 g/L of sulfathiazole sodium and 0.1-0.7 g/L of naphthylacetamide. The digestion solution can quickly and mildly digest organic impurities in a sample, can avoid mass loss while improving the digestion efficiency, and can protect functional groups of micro-plastics from being damaged in the digestion process. The invention further discloses a method for quantitatively detecting the micro-plastics in the water body based on the TGA-FTIR technology. The method comprises setting of instrument condition parameters, blank determination, drawing of a micro-plastic quantitative standard curve and sample detection. The method can be used for detecting the content of polyamide and polystyrene micro-plastic in a water body, and is simple, convenient and rapid to operate and high in accuracy.

Description

technical field [0001] The invention belongs to the field of environmental pollutant detection, and in particular relates to a rapid detection method and application of microplastic content in water bodies. Background technique [0002] The impact of microplastics on the environment is closely related to factors such as its size, type, and content. The most commonly used quantitative analysis methods for microplastics (such as FTIR, RAMAN) are based on the number of microplastic particles and cannot quantify each aggregate. Accurate calculation of the mass of the object type is time-consuming and labor-intensive. The development of rapid and accurate mass-based quantitative analysis methods for microplastics is a difficult and hot topic in the current research on quantitative analysis methods for microplastics. Thermogravimetric analysis (TGA) is a thermal analysis technique that uses a thermobalance to measure the relationship between the mass of a substance and temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3577G01N1/40
CPCG01N1/4044G01N21/3577
Inventor 蒋日进章春芳胡翠林王静
Owner MARINE FISHERIES RES INST OF ZHEJIANG
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