A method for rapid passivation of soil cadmium based on the principle of complexation and redistribution of amino acids

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

Active Publication Date: 2020-10-09
SOUTH CHINA AGRI UNIV
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  • 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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  • A method for rapid passivation of soil cadmium based on the principle of complexation and redistribution of amino acids
  • A method for rapid passivation of soil cadmium based on the principle of complexation and redistribution of amino acids
  • A method for rapid passivation of soil cadmium based on the principle of complexation and redistribution of amino acids

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Glycine (structure such as figure 1 Shown, purchased from Aladdin Reagent Company) after being prepared as a glycine solution, added to the soil contaminated by Cd. The physical and chemical properties of the soil are listed in Table 1.

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

[0038]

[0039] Investigate the rapid (3h) passivation of Cd in typical polluted farmland soil by adding amino acid.

[0040] Two treatments, CK (control) and TA (glycine), were respectively set up, and each treatment had 12 repetitions. Take by weighing the fresh soil for testing that is equivalent to air-dried soil weight 30g (the soil for testing is sampled from the plow layer soil with a thickness of 20cm), and put it into a 100mL polytetrafluoroethylene beaker. Match the concentration of glycine to 750mg N kg -1 Add soil, and use deionized water to adjust to 60% of the maximum field water holding capacity of the soil; the control treatment is to add ...

Embodiment 2

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

[0046] Select 3 repetitions in the two treatment groups of CK (contrast) and TA (glycine) involved in Example 1, and carry out sampling and determination of effective Cd content at 6 and 12 hours after the start of the experiment respectively, and other operating steps are the same as in Example 1 .

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

[0048] The passivation effect of table 3 glycine to polluted soil after treatment

[0049] time (h) CaCl 2 -Cd (mg kg -1 )

Embodiment 3

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

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

[0053] The results are shown in Table 4. After adding glycine for 24 and 48 hours, CaCl 2 -Cd decreased by 30%, 65%, respectively.

[0054] The passivation effect of table 4 glycine to polluted soil after treatment

[0055] time (h) CaCl 2 -Cd (mg kg -1 )

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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 control, in particular to a method for quickly passivating soil cadmium based on the principle of amino acid complexation redistribution. Background technique [0002] my country's soil quality and food safety are deteriorating day by day, and 300 million mu of arable land across the country is under the threat of heavy metal pollution, among which Cd is the most polluted, and its exceeding point ranks first in the country. Cd element often enters farmland soil with mining, mine acid water irrigation and atmospheric deposition. The unreasonable use of chemical fertilizers and pesticides in farmland also makes Cd accumulate in farmland soil. This poses a huge threat to my country's agricultural production and income increase and food security. [0003] Soil Cd pollution has a wide range, strong mobility, concealment, various types of pollution, and difficult control. Af...

Claims

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Application Information

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Patent Type & Authority Patents(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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