Method for extracting nanoparticle from soil

Abstract

The invention discloses a method for extracting nanoparticle from soil, comprising the following steps: the soil is made into soil suspension in a sedimentation container by means of chemical dispersion and supersonic dispersion; according to the sedimentation time of soil particle with grain diameter being less than 100nm, a peristaltic pump is used for driving a special pipette to absorb the soil grain suspension with a required grain diameter range; the absorbed soil grain solution is frozen and dried; and frozen and dried precursor is restored to obtain soil nanoparticle powder body. The method adopts chemical-physical dispersion and uses the peristaltic pump to drive the special pipette to absorb the soil suspension, thereby having high extraction efficiency; the grain diameter of the extracted grain is accordance with the range of nanometer grain level; and the frozen and dried soil grain diameter powder is even and is convenient for follow-on research work.

Description

technical field [0001] The invention belongs to the field of soil chemistry, and in particular relates to a method for extracting nanoparticles in soil. Background technique [0002] Soil nanoparticles (soil nanoparticles) refer to crystalline and amorphous solid substances with particle sizes in the nanometer scale (~1-100nm) formed during the natural soil formation process. Nanoparticles are ubiquitous in soil and are the most important constituents of environmental nanoparticles. Studies have shown that nanoparticles in soil are important element carriers in the environment and have an important impact on the biogeochemical processes of elements; they play a role in the migration, transformation, cycle and bioavailability of heavy metals and organic pollutants in soil. Controlling effect; it strongly influences important environmental processes such as soil genesis, soil physicochemical properties and environmental quality evolution. In addition, artificially synthesize...

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Problems solved by technology

[0004] At present, the preliminary methods for the separation and extraction of soil nanoparticles are mainly centrifugation, ultrafiltration and other methods. Components such as organic matter have significant interactions, and how to separate different nanoparticles is not ideal; in addition, the operating conditions of the current extraction method are not strict enough, and the extracted products, especially the particle size, are prone to human error; the particle size range of the extracted nanoparticles varies greatly , and the lack of unified standards cannot ensure the parallelism and accuracy of the analysis

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