Method for assisting vegetable crops to restore Cd-Zn-Pb composite contaminated soil by EDTA (Ethylene Diamine Tetraacetic Acid)

A compound pollution and soil technology, applied in the restoration of polluted soil, etc., can solve the problems of slow growth of enriched plants, low activity of heavy metals, small biomass, etc., to reduce repair costs and environmental risks, low technical requirements, The effect of strong tolerance and enrichment ability

Inactive Publication Date: 2013-03-27
CHANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low activity of the target heavy metals in many soils to be remediated, most of the enrichment plants that have been discovered grow slowly and have small biomass, while the enrichment plants that grow rapidly and have large biomass are generally difficult to absorb and enrich high-concentration heavy metals. Practical restoration poses many difficulties

Method used

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  • Method for assisting vegetable crops to restore Cd-Zn-Pb composite contaminated soil by EDTA (Ethylene Diamine Tetraacetic Acid)
  • Method for assisting vegetable crops to restore Cd-Zn-Pb composite contaminated soil by EDTA (Ethylene Diamine Tetraacetic Acid)
  • Method for assisting vegetable crops to restore Cd-Zn-Pb composite contaminated soil by EDTA (Ethylene Diamine Tetraacetic Acid)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The pot test site is in the net room of the Rice Research Institute in Wujin District, Changzhou City. The site is in a farm in Wujin District. There are no pollution sources around the experimental site, and it is an area that is not polluted by heavy metals and organic matter. The potting test soil was collected from the surface soil (0-20 cm) in the pollution-free area of ​​the Rice Research Institute in Wujin District, Changzhou City.

[0015] A total of 4 concentrations were set in the experiment, which were the control (CK, no Cd, Zn, Pb) and 3 different Cd, Zn, Pb concentration experiments, Cd concentration: 2.0mg / kg (T1 ), 6.0mg / kg (T2), 10.0mg / kg (T3), Zn concentration: 1000mg / kg (T1), 3000mg / kg (T2), 5000mg / kg (T3), Pb concentration: 1000mg / kg (T1), 3000mg / kg (T2), 5000mg / kg (T3), which are respectively 2, 6, and 10 times of the third-level standard of my country's soil environmental quality standard (GB15618,, 195), and the form of heavy metal added is CdCl 2...

Embodiment 2

[0024] The content of Cd, Zn and Pb added in the soil is 6mg / kg, 3000mg / kg and 3000mg / kg respectively, and the form of heavy metal added is CdCl 2 2.5H 2 O, ZnSO 4 ·7H 2 O, Pb(NO 3 ) 2 , add to the soil, mix well, and balance for half a year before use. Edamame seedlings with the same growth as in Example 1 were selected for transplanting. 2 weeks before the harvest of edamame, EDTA was applied near the root zone of the soil surface, and the artificial chelating agent was added at one time. Each treatment was repeated 3 times, and the edamame was harvested 2 weeks after the treatment. , Plant spinach seedlings in the soil, and the treatment method of spinach is the same as that of edamame. The specific implementation is shown in Table 2.

[0025] The application concentration of table 2 chelating agent EDTA

[0026]

[0027] The experimental results showed (Table 3 and Table 4), that one-time application of chelating agent EDTA 2 weeks before harvest would improve th...

Embodiment 3

[0033] The content of Cd, Zn and Pb added in the soil is 6mg / kg, 3000mg / kg and 3000mg / kg respectively, and the form of heavy metal added is CdCl 2 2.5H 2 O, ZnSO 4 ·7H 2 O, Pb(NO 3 ) 2 , add to the soil, mix well, and balance for half a year before use. , select and transplant the edamame seedlings consistent with the growth of Example 1, but the artificial chelating agent EDTA is added in two times, adding by the time described in Table 5, wherein the maturity is two weeks before the harvest, and the specific embodiments are shown in Table 5.

[0034] Table 5 The application order and concentration of EDTA

[0035]

[0036] The experimental results showed (Table 6 and Table 7): EDTA was applied when it was mature, and EDTA was applied one week before harvest. The accumulation of Cd, Zn, and Pb reached 6.8 times, 3.25 times, and 4.9 times that of the control, respectively.

[0037] Treatment 3 is better than the one-time application of EDTA in Example 2. The divided ...

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Abstract

The invention relates to vegetable restoration of heavy metal composite contaminated soil, and in particular relates to a method for restoring Cd-Zn-Pb composite contaminated soil by virtue of strengthening measures. The method comprises the following steps of planting vegetable crops such as green soy beans and spinach in soil to be restored in successions according to seasons; adding a chelating agent EDTA to the soil when the green soy beans and spinach grow to a mature period; integrally removing the vegetables after the crops grow for 10-15 days to achieve the purpose of restoring Cd-Zn-Pb composite contaminated soil. According to the method provided by the invention, EDTA is applied, so that not only can heavy metal contaminants in the soil be activated, but also the restoring effect of the vegetable crops to Cd-Zn-Pb can be remarkably improved so as to accelerate a process of restoring the Cd-Zn-Pb composite contaminated soil by the plants. The method has the advantages of low restoring cost, high restoring efficiency, strong operability and low environment risk, and the like.

Description

technical field [0001] The invention relates to vegetable crop restoration of heavy metal compound polluted soil, in particular to a method for repairing Cd-Zn-Pb compound polluted soil by using strengthening measures. Background technique [0002] The problem of heavy metal pollution is becoming more and more serious in our country. According to statistics, there are about 13,000 hm 2 Cultivated land is polluted by heavy metals such as Cd and Pb, and the grain production has been reduced by 10 million tons due to heavy metal pollution [Document 1: Yang Shujing, Zhang Aiping, Yang Shiqi, et al. Analysis of the current situation of agricultural non-point source pollution and research progress at home and abroad[J]. Meteorology, 2009, 30:82-85]. Heavy metals in the soil are absorbed by plants and inhibit their growth, resulting in crop yield reduction or even failure, and eventually enter the human body through the food chain to endanger health [Document 2: Maeda S, Kawachi T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 李定龙赵洁杨彦陆晓松
Owner CHANGZHOU UNIV
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