Method for rapidly passivating soil cadmium-lead active components by using glycine

A glycine and soil technology, applied in chemical instruments and methods, restoration of polluted soil, soil conditioning materials, etc., can solve the problems of secondary pollution of soil, high cost of cadmium and lead soil, etc., and achieve environmental friendliness, stable reaction, and Tend to the effect

Inactive Publication Date: 2018-05-29
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 problem of high cost of repairing cadmium and lead soil in the prior art, and the shor

Method used

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  • Method for rapidly passivating soil cadmium-lead active components by using glycine
  • Method for rapidly passivating soil cadmium-lead active components by using glycine
  • Method for rapidly passivating soil cadmium-lead active components by using glycine

Examples

Experimental program
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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 that has been compounded by Cd and Pb pollution. The physical and chemical properties of the tested soils 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 cadmium and lead in typical polluted farmland soil by adding amino acid.

[0040] Two treatment groups, 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 holdi...

Embodiment 2

[0045] This example investigates the passivation degree of glycine addition on Cd and Pb compound 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 and Pb content respectively at 6 and 12 hours after the start of the experiment, and other operating steps are implemented with example 1.

[0047] The results are shown in Table 3, figure 2 As shown, after adding glycine for 6 and 12 hours, CaCl 2-Cd decreased by 16%, 27%, respectively, CaCl 2 -Pb was reduced by 25%, 32%, respectively.

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

[0049]

Embodiment 3

[0051] This example further examines the passivation degree of the glycine addition involved in Example 1 on the combined pollution of Cd and Pb in typical farmland soil.

[0052] Select 3 repetitions in the two treatment groups of CK (control) and TA (glycine) involved in Example 1, and carry out sampling and determination of effective Cd and Pb contents 24 and 48 hours after the start of the experiment respectively.

[0053] The results are shown in Table 4, figure 2 As shown, CaCl 2 -Cd was reduced by 30%, 65%, CaCl 2 -Pb was reduced by 52%, 70%, respectively.

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

[0055]

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Abstract

The invention discloses a method for rapidly passivating soil cadmium-lead active components by using glycine. By adopting the method, heavy metals in the soil can be effectively and rapidly passivated by independently using glycine, more heavy metals are distributed onto soil solids ingeniously by virtue of the glycine complexing and the re-distribution of a complex in the solid phase and the liquid phase of the soil, and a purpose of rapidly and efficiently passivating the heavy metals can be achieved. The method for passivating the heavy metals is simple and low in cost, does not need the complicated material combination, does not need the energy-consuming production process, and does not need an external solid material serving as a precipitating agent. The method is not only rapid andeffective for the pollution of a single heavy metal, but also rapid and significant in the passivation effect for the complicated heavy metal pollution, and has practicability on the problem for treating the soil pollution; and moreover, the secondary pollution is avoided, no adverse impact is caused for the environment, and the method is environment-friendly.

Description

technical field [0001] The invention belongs to the field of environmental protection and soil heavy metal control, and in particular relates to a method and application for rapidly passivating active components of cadmium and lead in soil by using glycine. Background technique [0002] Both farmland and urban soil are polluted by heavy metals to varying degrees, especially Cd and Pb elements. Vehicle exhaust in the city, gas and dust deposition from the production and transportation of building materials, and the stacking and disposal of solid waste, including domestic garbage and industrial waste, are the main factors causing heavy metal pollution in urban soil. The unreasonable use of chemical fertilizers and pesticides in farmland also makes heavy metals accumulate in farmland soil. [0003] Soil heavy metal pollution has a wide range, long duration, and concealment. After pollution, it will have a toxic effect on crops, and even accumulate in crops. It progresses throu...

Claims

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Application Information

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IPC IPC(8): C09K17/14B09C1/08C09K101/00
Inventor 张玉龙何澍然李永涛张振柯美国王进进周颖茵
Owner SOUTH CHINA AGRI UNIV
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