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Quantitative determination of the total amount of micro-nanoplastics in water environment based on total organic carbon

A technology for quantitative determination of total organic carbon, which is applied in the field of environmental analytical chemistry and can solve the problems of expensive instruments, low sensitivity and narrow application range.

Active Publication Date: 2021-05-14
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have shortcomings such as narrow scope of application (for example, only suitable for certain materials), time-consuming and labor-intensive, low sensitivity, expensive instruments, etc., and are difficult to be used for quantitative analysis of the total amount of micro-nano plastics in actual environmental water bodies

Method used

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  • Quantitative determination of the total amount of micro-nanoplastics in water environment based on total organic carbon
  • Quantitative determination of the total amount of micro-nanoplastics in water environment based on total organic carbon
  • Quantitative determination of the total amount of micro-nanoplastics in water environment based on total organic carbon

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Embodiment 1

[0067] Quantitative determination of micro-nanoplastics in different matrix waters.

[0068] First, 100-1000mL of different substrate water samples are passed through a glass fiber membrane with a pore size of 300nm. (m / v)H 2 o 2 Add 5mL 0.05M Fe 2+ ) to remove the interference of NOM. Immediately filter the digested solution with another membrane, wash with ultrapure water (18.3MΩ) three times, then transfer the two membranes to the sample boat and dry at 60°C-190°C for 0.5-6 hours to remove water. Finally, TOC was measured with a TOC meter connected to a solid accessory. The total amount of micro-nanoplastics is represented by the TOC value, and the results are shown in Table 1. Among them, no micro-nanoplastics were detected in the water samples of Daliaohe River, Luanhe River, and Bohai Sea, indicating that these samples did not contain micro-nanoplastics or The concentration is well below the detection limit of the method. 17-67μg C / L was detected in several samples...

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Abstract

A method for quantitatively determining the total amount of micro-nanoplastics in a water environment based on total organic carbon, the method comprising filtering the water sample with a first enrichment membrane to collect the first solid; Add a digestion reagent to the collection membrane to digest and remove the natural organic matter; then use the second enrichment membrane to filter the mixture obtained in the above steps to obtain the second enrichment membrane with the second solid; the digested first enrichment membrane drying the second enrichment film with the second solid, and then measuring the total organic carbon value, which is the total organic carbon value of the micro-nano plastic. The invention uses the TOC value of micro-nano plastics to represent the total amount of micro-nano plastics, realizes the measurement of the total amount of micro-nano plastics at the μg C / L level, and is successfully applied to the accurate quantitative analysis of the total amount of micro-nano plastics in actual water samples ; High sensitivity, easy operation, low operating cost.

Description

technical field [0001] The invention relates to the field of environmental analytical chemistry, in particular to a method for quantitatively measuring the total amount of micro-nano plastics in a water environment based on total organic carbon. Background technique [0002] Due to its excellent physical and chemical properties, plastic products are widely used in daily production and life. Ultimately, these plastic products often end up in the environment as plastic waste. A large amount of plastic waste will be decomposed under the action of solar radiation, water impact and biodegradation to form micro-nano plastics. On the other hand, micro-nanoplastics are also used in industrial raw materials and daily cosmetics. During the use of these products, micro-nanoplastics will also be released into the environment. [0003] In recent years, micro-nanoplastics have been listed as a new type of pollutant by environmentalists. Toxicological research shows that micro-nanoplas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/3577G01N1/28G01N1/34G01N1/44
CPCG01N1/28G01N1/34G01N1/44G01N21/3577
Inventor 刘景富李鹏谭志强李庆存
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI