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Method for evaluating electron loss capability of micro-plastic through trivalent arsenic oxide rate of micro-plastic

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: 2021-11-02
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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  • Method for evaluating electron loss capability of micro-plastic through trivalent arsenic oxide rate of micro-plastic
  • Method for evaluating electron loss capability of micro-plastic through trivalent arsenic oxide rate of micro-plastic
  • Method for evaluating electron loss capability of micro-plastic through trivalent arsenic oxide rate of micro-plastic

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Embodiment 1

[0038] Example 1: A method for evaluating the ability of microplastics to lose electrons by the rate of oxidation of trivalent arsenic by microplastics, specifically comprising: combining microplastics with a solution containing trivalent arsenic at a concentration of 0.25 mg / L according to a mass volume ratio of 1 mg / ml Mix evenly, and then carry out shaking culture in an aerobic environment; and take samples at 0, 1, 2, 4, 6, and 10 hours, pass through a 0.22 micron filter membrane, store the filtrate with 0.2M hydrochloric acid, and then measure it with an atomic fluorescence photometer Trivalent arsenic and total arsenic content, according to the change of trivalent arsenic concentration with reaction time, calculate the oxidation rate of arsenic, which is used 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 the rate of oxidation of trivalent arsenic by microplastics, specifically comprising: combining microplastics with a solution containing trivalent arsenic at a concentration of 0.5 mg / L at a mass volume ratio of 1.5 mg / L The ratio of ml was mixed evenly, and then shaken and cultured in an aerobic environment; and samples were taken at 0, 1, 2, 4, 6, and 10 hours, passed through a 0.22 micron filter membrane, and the filtrate was preserved with 0.2M hydrochloric acid, followed by an atomic fluorescence photometer Measure the content of trivalent arsenic and total arsenic, and calculate the oxidation rate of arsenic according to the change of trivalent arsenic concentration with the reaction time, which is 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 the rate of oxidation of trivalent arsenic by microplastics, specifically comprising: combining microplastics with a solution containing trivalent arsenic at a concentration of 1 mg / L according to a mass volume ratio of 2 mg / ml The ratio was mixed evenly, and then shaken and cultured in an aerobic environment; and samples were taken at 0, 1, 2, 4, 6, and 10 hours, passed through a 0.22 micron filter membrane, and the filtrate was preserved with 0.2M hydrochloric acid, and then measured with an atomic fluorescence spectrometer. 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 electron loss capability of micro-plastic through trivalent arsenic oxide rate of micro-plastic. The method specifically comprises the following steps of uniformly mixing micro-plastics and a solution containing 0.25-1mg / L of trivalent arsenic according to the mass-volume ratio of 1-2mg / ml, and then carrying out shake culture in an aerobic environment; sampling at 0, 1, 2, 4, 6 and 10 hours, passing through a 0.22-micron filter membrane, storing the filtrate with 0.2 M hydrochloric acid, then determining the content of trivalent arsenic and total arsenic by using an atomic fluorescence spectrophotometer, and calculating the oxidation rate of arsenic according to the change condition of the concentration of trivalent arsenic along with the reaction time so as to estimate the electron loss ability of the micro-plastic. The method disclosed by the invention is reasonable in overall design, functional groups with electron loss capability in the micro-plastic react with oxygen to generate hydrogen peroxide so as to react with the trivalent arsenic, and the electron loss capability of the micro-plastic is evaluated according to the oxidation speed of the trivalent arsenic; the method is simple in process and suitable for large-scale popularization.

Description

technical field [0001] The invention relates to the technical field of measuring the electron capacity of microplastics, in particular to a method for evaluating the ability of microplastics to lose electrons through the oxidation rate of trivalent arsenic by microplastics. Background technique [0002] Plastic products are widely used in industrial and agricultural production and life, and more than 55% of plastic products are released into the environment after use due to improper disposal, resulting in the widespread presence of microplastics in the water environment, terrestrial environment, and atmospheric environment pollute. 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 physical, chemical and biological complex effects, which will eventually change the environment of microplastics. Migration, transformation and ecotoxic eff...

Claims

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Application Information

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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
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