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Method for separating and purifying soil colloid

A separation method and soil technology, applied in the field of soil colloid separation and purification, can solve the problems of difficult suction and filtration, pollution, time-consuming and laborious, etc., and achieve good dispersion effect and fast separation and extraction speed

Inactive Publication Date: 2011-05-18
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the suction filtration, the power of the compression pump limits the number of samples, and only a few samples can be filtered at a time. In addition, the colloid adheres to the Pasteur filter tube during the suction filtration process, making it difficult to filter. It is time-consuming and labor-intensive to scrape off the colloid with the filter tube, and it may also cause pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Weigh 30 grams of soil in a 400 ml beaker, add distilled water to adjust the soil-water ratio to 1:10, and place it for 24 hours;

[0017] (2) Pour directly into the tank of the trough-type ultrasonic generator for ultrasonic dispersion for 20 minutes, the frequency of ultrasonic is 40kHz, and the intensity of ultrasonic is 1.5W / cm 2 ;

[0018] (3) All the dispersed suspension is moved into a 1000 ml tall beaker, a line is drawn on the outer wall of the beaker at 5 cm and 15 cm from the bottom of the cup, and distilled water is added to make the suspension just reach the 15 cm mark;

[0019] (4) Use a circular stirring rod with holes made of stainless steel to stir up the soil at the bottom of the cup first, then stir it up and down 10 times, immediately record the time when the sedimentation begins, and measure the temperature of the suspension. According to the temperature, look up the table (all levels Soil particle absorption schedule can be checked " soil coll...

Embodiment 2

[0024] Compared with embodiment 1, the difference is:

[0025] Place it for 36 hours in step (1); ultrasonically disperse for 30 minutes in step (2), the frequency of ultrasound is 28kHz, and the intensity of ultrasound is 2.2W / cm 2 ; In the step (7), the rotating speed is 12000 rpm, and it is centrifuged for 10 minutes. The mass of the soil original colloid finally obtained is 3.92 grams.

Embodiment 3

[0027] Compared with embodiment 1, the difference is:

[0028] Place in step (1) for 30 hours; in step (2), ultrasonically disperse for 25 minutes, the frequency of ultrasonic is 45kHz, and the intensity of ultrasonic is 3W / cm 2 ; In step (7), the rotating speed is 10000 rev / min, centrifuged for 15 minutes. The mass of the soil original colloid finally obtained is 3.86 grams.

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Abstract

The invention discloses a method for separating and purifying soil colloid, which is characterized by comprising the following steps: (1) soaking soil with water; (2) ultrasonic dispersion; (3) obtaining soil colloid suspension by a sedimentation siphon separation method; and (4) carrying out centrifugal separation on the soil colloid suspension by rotating speed of 8000-12000 r / m, pouring out the supernatant and obtaining the soil colloid. The method can obtain the raw colloid directly and fast, avoids the pollution possibly brought by the original method and saves the time of separation andpurification.

Description

technical field [0001] The invention relates to a method for separating and purifying soil colloids. Background technique [0002] Because soil colloid has a huge surface area and strong adsorption properties, it is in a more active state in the soil and closely affects soil fertility. Therefore, in soil physical and chemical research, it is often necessary to understand the colloidal properties of soil. In order to study the composition and characteristics of soil colloids, the colloids must first be separated from the soil. During the separation process, the original physical and chemical properties of the soil colloids should not be changed as much as possible. Therefore, physical dispersion is generally advocated instead of adding dispersants. chemical dispersion. In recent years, physical dispersion generally uses ultrasonic waves to directly disperse the soil suspension under the condition of no oxidant or dispersant, and then obtain the colloidal suspension by the se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28
Inventor 刘婷琳孙翠香王燕曾晓舵周顺桂
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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