Method for extracting soil nano colloid

A nano-colloid and soil technology, applied in the field of soil chemistry, can solve problems such as insufficient operating conditions, long extraction time, and low extraction volume, and achieve the effects of ensuring parallelism and accuracy, reducing sample loss, and shortening extraction time

Pending Publication Date: 2021-08-17
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there is no unified standard method for the separation and extraction of soil nanocolloids. Common methods include shock-sedimentation method, chemical dispersion-sedimentation method, centrifugal sedimentation method, etc. The use of chemical dispersion will destroy some of the original characteristics of soil nanocolloids. The shortcomings of long time, small amount of extraction, and inability to extract in batches; in addition, the operating conditions of the current extraction method are not strict enough, and the extraction product, especially the particle size, is easy to introduce human errors; Parallelism and accuracy of analysis

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  • Method for extracting soil nano colloid
  • Method for extracting soil nano colloid
  • Method for extracting soil nano colloid

Examples

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Embodiment 1

[0035] The embodiment of the present invention selects yellow soil, collected from a paddy field in Anqing, Anhui.

[0036] (1) Air-dry the collected soil naturally, remove gravel, gravel and plant roots, etc., grind through a 10-mesh sieve, and mix the soil evenly after sieving.

[0037] (2) Take 50 g of the above uniformly mixed soil, add 1 L of ultrapure water and stir with a glass rod for 5-10 min to obtain a soil suspension.

[0038] (3) Ultrasonic disperse the soil suspension for 1 hour, and transfer the upper layer liquid into a 50ml centrifuge tube.

[0039] (4) Centrifuge the components transferred into the centrifuge tube, calculate according to the Stokes formula, set the centrifugation speed to 6030 rpm / min, centrifuge temperature at 4°C, centrifuge for 20 min, centrifuge three times in total, and take the supernatant each time solution to obtain a soil nanocolloid suspension.

[0040] (5) Concentrate 600mL of soil nanocolloid suspension by tangential flow ultraf...

Embodiment 2

[0044] The embodiment of the present invention selects brown soil, which is collected from a paddy field in Xinxiang, Henan.

[0045] (1) Air-dry the collected soil naturally, remove gravel, gravel and plant roots, etc., grind through a 10-mesh sieve, and mix the soil evenly after sieving.

[0046] (2) Take 50 g of the above uniformly mixed soil, add 1 L of ultrapure water and stir with a glass rod for 5-10 min to obtain a soil suspension.

[0047] (3) Ultrasonic disperse the soil suspension for 1 hour, and transfer the upper layer liquid into a 50ml centrifuge tube.

[0048] (4) Centrifuge the components transferred into the centrifuge tube, calculate according to the Stokes formula, set the centrifugation speed to 6030 rpm / min, centrifuge temperature at 4°C, centrifuge for 20 min, centrifuge three times in total, and take the supernatant each time solution to obtain a soil nanocolloid suspension.

[0049] (5) Concentrate 600mL of soil nanocolloid suspension by tangential f...

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Abstract

The invention discloses a method for extracting soil nano colloid, the method mainly comprises the following steps: drying soil to be extracted in air, grinding and sieving, and uniformly mixing the sieved soil; secondly, adding ultrapure water into the uniformly mixed soil, and stirring by using a glass rod to obtain soil turbid liquid; then carrying out ultrasonic dispersion treatment on the soil turbid liquid, taking supernatant liquid and transferring the supernatant liquid into a centrifugal tube; performing centrifugal treatment on the components transferred into the centrifugal tube to obtain the soil nano colloid suspension; finally, concentrating the soil nano colloid suspension by utilizing a tangential flow ultrafiltration method; dialyzing the concentrated solution by using ultrapure water to remove redundant ions and small molecular substances in the concentrated solution; and centrifugally concentrating to obtain the soil nano colloidal solid.

Description

technical field [0001] The invention relates to the field of soil chemistry, in particular to a method for extracting soil nano colloids. Background technique [0002] Nano-colloid is a highly dispersed nano-scale heterogeneous heterogeneous system in the environment, which is composed of two different states of dispersed phase and continuous phase, also known as nano-colloidal dispersion or mixture. It is generally divided into two categories, one is naturally formed in nature, and the other is released to the environmental system after artificial synthesis. Among them, soil nanocolloids usually refer to colloidal particles with a particle size of 1-100nm formed during the natural soil formation process, and its composition is diverse, which is one of the main sources of natural nanocolloids. Biological pathways (microorganisms acting on animal and plant residues), abiotic pathways (mineral weathering) and their combined pathways are the three main ways for the formation o...

Claims

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Application Information

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IPC IPC(8): B01J13/00
CPCB01J13/00
Inventor 周启星毕志成欧阳少虎
Owner NANKAI UNIV
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