Digestion solution for digesting organic impurities in micro-plastics, preparation method of digestion solution and digestion method based on digestion solution

Abstract

The invention provides a digestion solution for digesting organic impurities in micro-plastics, a preparation method of the digestion solution and a digestion method based on the digestion solution, and relates to the technical field of micro-plastic impurity treatment. The digestion solution comprises potassium persulfate and an alkaline compound, and the concentration ratio of the potassium persulfate to the alkaline compound in the digestion solution is 1: (1-3), wherein the concentration of potassium peroxodisulfate in the digestion solution is 0.1 to 0.35 mol / L. When the digestion solution containing the potassium peroxodisulfate with the specific concentration and the alkaline compound is used for digesting the organic impurities in the micro-plastic, high digestion rate of organic impurities in the micro-plastic is realized without damage to the micro-plastic or interference of the colorless reaction system on the subsequent qualitative detection of the micro-plastic, and effective alleviation of the difficult qualitative detection of the micro-plastic caused by the general mixing of a large amount of organic impurities in the micro-plastic sample in present environments canbe realized.

Description

technical field [0001] The invention relates to the technical field of impurity treatment in microplastics, in particular to a digestion solution for digesting organic impurities in microplastics, a preparation method thereof, and a digestion method based on the digestion solution. Background technique [0002] "Microplastics" refers to plastic fragments, particles, fibers or films with a particle size of less than 5 mm. With the development of modern science and technology, plastics are widely used around the world, and the distribution of microplastics with a particle size below 5mm shows a global trend and brings persistent pollution to the marine environment. Microplastics in the environment migrate to various places through different transport mechanisms, including surface water bodies, deep water bodies, sediments, and even Arctic sea ice. Therefore, research on the harm of microplastics to the marine environment and even the global ecology, and the establishment of a...

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Problems solved by technology

However, a large amount of gas and heat are often released during the violent reaction of the Fenton reagent, and the operation of the Fenton reagent method cannot be separated from manual work, which has potential experimental dangers; especially in the construction of in-situ automatic processing equipment for samples, It is easy to cause a large impact on the device system and cannot be used effectively; on the other hand, the solution generated by the Fenton reagent reaction is yellow and rich in a large amount of ferric ions. interference

It can be seen that there are certain defects in the existing methods for the digestion of organic impurities in the above two commonly used microplastics.

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