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A method for evaluating the ability of microplastics to lose electrons by the rate of trivalent arsenic oxidation of microplastics

A technology for oxidizing trivalent and microplastics, which is applied in the direction of material analysis, material analysis, and material excitation analysis through optical means, which can solve problems such as susceptibility to oxygen interference, and achieve the effect of reasonable overall design and simple process

Active Publication Date: 2022-07-26
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When detecting the electron loss capacity of microplastics, the above two analysis and detection methods need to be operated in an anaerobic glove box, and the reaction solution also needs to be aerated to remove oxygen. The entire analysis process is extremely susceptible to oxygen interference.

Method used

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  • A method for evaluating the ability of microplastics to lose electrons by the rate of trivalent arsenic oxidation of microplastics
  • A method for evaluating the ability of microplastics to lose electrons by the rate of trivalent arsenic oxidation of microplastics
  • A method for evaluating the ability of microplastics to lose electrons by the rate of trivalent arsenic oxidation of microplastics

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Embodiment 1

[0038] Embodiment 1: A method for evaluating the electron loss ability of microplastics by oxidizing trivalent arsenic of microplastics, specifically comprising: mixing the microplastics with a solution containing trivalent arsenic with a concentration of 0.25 mg / L according to a mass-volume ratio of 1 mg / ml The ratio of the filtrate was mixed evenly, and then the shaking culture was carried out in an aerobic environment; and sampling was performed at 0, 1, 2, 4, 6, and 10 h, passed through a 0.22-micron filter membrane, and the filtrate was stored with 0.2M hydrochloric acid, and then determined with an atomic fluorescence spectrometer. The content of trivalent arsenic and total arsenic was calculated according to the change of the concentration of trivalent arsenic with the reaction time, and the oxidation rate of arsenic was calculated to estimate the electron loss ability of microplastics.

Embodiment 2

[0039] Embodiment 2: A method for evaluating the ability of microplastics to lose electrons by oxidizing trivalent arsenic in microplastics, specifically comprising: mixing microplastics with a solution containing trivalent arsenic with a concentration of 0.5 mg / L in a mass-to-volume ratio of 1.5 mg / L. The ratio of ml was mixed evenly, and then shaken cultured in an aerobic environment; and samples were taken at 0, 1, 2, 4, 6, and 10 h, passed through a 0.22-micron filter, and the filtrate was stored with 0.2M hydrochloric acid, followed by an atomic fluorescence spectrometer. The content of trivalent arsenic and total arsenic was measured, and the oxidation rate of arsenic was calculated according to the change of the concentration of trivalent arsenic with the reaction time, which was used to estimate the electron loss ability of microplastics.

Embodiment 3

[0040] Embodiment 3: a method for evaluating the ability of microplastics to lose electrons by oxidizing trivalent arsenic in microplastics, specifically comprising: mixing the microplastics with a solution containing trivalent arsenic with a concentration of 1 mg / L according to a mass-volume ratio of 2 mg / ml. The proportions were mixed evenly, and then shaken and cultured in an aerobic environment; and samples were taken at 0, 1, 2, 4, 6, and 10 h, passed through a 0.22-micron filter membrane, and the filtrate was stored with 0.2 M hydrochloric acid. Valence arsenic and total arsenic content, according to the change of trivalent arsenic concentration with reaction time, the oxidation rate of arsenic was calculated, which was used to estimate the electron loss ability of microplastics.

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Abstract

The invention discloses a method for evaluating the electron loss ability of microplastics by oxidizing trivalent arsenic of microplastics, which specifically includes: mixing microplastics with a solution containing trivalent arsenic with a concentration of 0.25-1 mg / L in a mass-to-volume ratio of 1- The ratio of 2mg / ml was mixed evenly, and then the shaking culture was carried out in an aerobic environment; and samples were taken at 0, 1, 2, 4, 6, and 10 hours, and passed through a 0.22-micron filter membrane. The content of trivalent arsenic and total arsenic is measured by a photometer, and the oxidation rate of arsenic is calculated according to the change of the concentration of trivalent arsenic with the reaction time, which is used to estimate the electron loss ability of microplastics; The functional group with electron loss ability reacts with oxygen to generate hydrogen peroxide, which can then react with trivalent arsenic, and the electron loss ability of microplastics is evaluated according to the oxidation speed of trivalent arsenic; the method of the invention is simple in process and suitable for mass promotion.

Description

technical field [0001] The invention relates to the technical field of electronic capacity measurement of microplastics, in particular to a method for evaluating the ability of microplastics to lose electrons through the rate of trivalent arsenic oxidation of microplastics. Background technique [0002] Plastic products are widely used in industrial and agricultural production and life. After use, more than 55% of plastic products are released into the environment because they are not properly disposed of, resulting in widespread microplastics in the water environment, terrestrial environment and atmospheric environment. Pollution. When microplastics enter the environment, they will decrease in size, increase in specific surface area, increase in hardness, and generate functional groups such as oxygen and sulfur through the combined effects of physics, chemistry and biology, and finally change the microplastic environment. Migration, transformation and ecotoxic effects. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64G01N1/34
CPCG01N21/6404G01N1/34
Inventor 杨敏范婷婷吴运金邓绍坡王荐陈琳李旭伟黄剑波
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA