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Method for rapidly passivating soil cadmium based on amino acid complexing redistribution principle

A soil and complexation technology, applied in the restoration of polluted soil, etc., can solve the problems of soil compaction and acidification, high cost of Cd-contaminated farmland soil, and achieve the effects of fast passivation, friendly environmental response, and stable response.

Active Publication Date: 2018-07-20
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The primary purpose of the present invention is to overcome the disadvantages and deficiencies in the prior art of repairing Cd-contaminated farmland soil that the cost is high, and may cause soil compaction and acidification, and to provide the application of glycine to quickly passivate cadmium in soil based on the principle of complexation redistribution

Method used

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  • Method for rapidly passivating soil cadmium based on amino acid complexing redistribution principle
  • Method for rapidly passivating soil cadmium based on amino acid complexing redistribution principle
  • Method for rapidly passivating soil cadmium based on amino acid complexing redistribution principle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Glycine (structure such as figure 1 As shown, purchased from Aladdin Reagent Company) after being prepared as a glycine solution, it was added to the soil contaminated by Cd. See Table 1 for the physical and chemical properties of soil.

[0037] Table 1 Basic physical and chemical properties of tested soil

[0038]

[0039] To investigate the rapid (3h) addition of amino acids to inactivate Cd in typical contaminated farmland soil.

[0040] There are two treatments of CK (control) and TA (glycine), each with 12 replicates. Weigh 30 g of fresh soil for testing (the soil for testing is sampled from a cultivated layer with a thickness of 20 cm), and put it into a 100 mL polytetrafluoroethylene beaker. Match glycine concentration to 750mg N kg -1 Add the soil and adjust with deionized water to 60% of the maximum water holding capacity of the soil field; the control treatment is to add the same amount of deionized water. Placed in a 25°C constant temperature biological incubator...

Embodiment 2

[0045] This example further investigates the degree of passivation of Cd pollution in typical farmland soil by glycine addition.

[0046] Select 3 replicates of the two treatment groups of CK (control) and TA (glycine) involved in Example 1, and perform sampling at 6 and 12 hours after the start of the experiment to determine the effective state Cd content. The other operating steps are the same as in Example 1. .

[0047] The results are shown in Table 3 and figure 2 As shown, CaCl 6 and 12 hours after adding glycine 2 -Cd decreased by 16% and 27% respectively.

[0048] Table 3 Passivation effect of glycine on contaminated soil after treatment

[0049] Time(h)

Embodiment 3

[0051] This example further investigates the degree of passivation of Cd pollution in typical farmland soil by the addition of glycine involved in Example 2.

[0052] Three replicates of the two treatment groups of CK (control) and TA (glycine) involved in Example 1 were selected, and samples were taken 24 and 48 hours after the start of the experiment to determine the effective Cd content.

[0053] The results are shown in Table 4. CaCl 24 and 48 hours after the addition of glycine 2 -Cd decreased by 30% and 65% respectively.

[0054] Table 4 Passivation effect of glycine on contaminated soil after treatment

[0055] Time(h)

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Abstract

The invention discloses a method for rapidly passivating soil cadmium based on an amino acid complexing redistribution principle. The method is characterized in that by independently applying glycine,heavy metal cadmium (Cd <2+>) in soil can be effectively and quickly passivated, meanwhile, by ingeniously utilizing glycine complexing and combining that the complex is redistributed on the solid-liquid two-phase soil, more heavy metals are distributed to the solid-phase soil, and finally the purpose of rapidly and efficiently passivating the heavy metals is achieved. According to the method forpassivating the heavy metal cadmium, the method is simple, the cost is low, a complex material combination is not needed, the energy-consumption production process is not needed, an exogenous solid material does not need to be used as a precipitant; and moreover, secondary pollution does not exist, negative effects on the environment do not exist, and the method is environment-friendly.

Description

Technical field [0001] The invention belongs to the field of environmental protection and soil heavy metal treatment, and particularly relates to a method for quickly passivating soil cadmium based on the principle of amino acid complexation and redistribution. Background technique [0002] my country's soil quality and food safety are deteriorating day by day. The country's 300 million mu of arable land is being threatened by heavy metal pollution, of which Cd pollution is the most serious, and its over-standard points rank first in the country. Cd element often enters farmland soil with mining, mine acid water irrigation, atmospheric deposition, and the unreasonable use of chemical fertilizers and pesticides in farmland also makes Cd continuously accumulate in farmland soil. This poses a huge threat to my country's agricultural production and income increase and food security. [0003] Soil Cd has a wide range of pollution, strong mobility, concealment, various types of pollutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 李永涛何澍然柯美国张玉龙张振王进进周文迪
Owner SOUTH CHINA AGRI UNIV
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