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Heavy metal polluted soil plant repair method

A technology for polluted soil and phytoremediation, applied in the field of phytoremediation of polluted environment, can solve the problems of difficult complexing agent, groundwater pollution of ecological environment, reduction of biomass, etc. Effect

Inactive Publication Date: 2005-07-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in the study of chelation-induced plant extraction, there are the following problems: (1) Most heavy metal-contaminated soils are polymetallic-contaminated soils, so it is key to screen out plant species with large biomass and the ability to enrich multiple heavy metals (2) Although most complexing agents can significantly increase the content of heavy metals in plants, most plants will also reduce their biomass under the poisoning of high-concentration heavy metals, so how to ensure that both improve phytoremediation efficiency and reduce phytotoxicity It is especially important; (3) The most widely used complexing agent such as EDTA is difficult to be degraded by microorganisms in the environment, and it is easy to pollute the ecological environment, especially groundwater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The corn variety used was Chaotian 38 developed by the Guangdong Academy of Agricultural Sciences. The soil used for the test was taken from the paddy field soil irrigated with mine sewage in Dabaoshan, Guangdong. 2.45 and 429 mg / kg. The soil weight per pot is 4kg (dry weight), and the base fertilizer application rates are (in terms of dry weight per kilogram of soil): 200mgN, 100mgP 2 o 5 and 100mgK 2 O, balance for two weeks. The chemical reagents EDTA, NTA and CA used were of analytical grade.

[0016] After the corn seedlings were raised, the seedlings with consistent growth were transplanted into the test soil, one plant per pot. The additive was sprayed once to the soil 15 days before harvest. Harvest after 15 days, measure the aboveground biomass of the plant and its heavy metal concentration, and calculate its accumulation. Additive dosage is 2.5~10mmol / kg soil: ①Blank control (Control); ②EDTA (EDTA); ③NTA (NTA); ④CA (CA); ⑤EDTA:NTA=1:2(EDTA+NTA); CA=1:2:...

Embodiment 2

[0043] The basic implementation conditions are the same as in Example 1, the difference is that the additives are applied in 5 times, spraying starts 15 days before harvest, and is applied once every other day. The experiment is repeated three times, and the repair efficiency is compared with the one-time application results of the corresponding additives. , the results are shown in Table 2.

[0044] Table 2 Effects of different application methods on the uptake of heavy metals in corn shoots

[0045] Cu Zn

[0046] Biomass

[0047] Treatment Concentration Cumulative amount Restorative effect Concentration Cumulative amount Restorative effect

[0048] (g / pot)

[0049] (mg / kg) (mg / pot) Rate Comparison (mg / kg) (mg / pot) Rate Comparison

[0050] EDTA 15.81 292.52±21.17 4.62±0.33 1.52 1153.32±141.52 18.23±2.24 1.55

[0051] NTA 25.38 296.36±30.51 7.52±...

Embodiment 3

[0068] The soil pH was adjusted to 4, and the total amounts of Cu and Zn were 1000mg / kg and 2000mg / kg, respectively. Additive dosage is 2.5~10mmol / kg soil: ①Blank control (Control); ②EDTA (EDTA); ③NTA (NTA); ④CA (CA); ⑤EDTA:NTA=1:1(EDTA+NTA); CA=1:2:10 (EDTA+NTA+CA). All the other conditions are with embodiment 2. The results are shown in Table 3.

[0069] Table 3 The absorption efficiency of heavy metals Cu and Zn in the aboveground part of corn

[0070] Cu Zn

[0071] Biomass

[0072] Treatment Concentration Cumulative amount Restorative effect Concentration Cumulative amount Restorative effect

[0073] (g / pot)

[0074] (mg / kg) (mg / pot) Rate Comparison (mg / kg) (mg / pot) Rate Comparison

[0075] Control 20.45 82.02±5.80 1.68±0.12 1.00 365.80±28.53 7.48±0.58 1.00

[0076] EDTA 12.53 452.49±26.90 5.67±0.34 3.38 1532.13±59.34 19.19±...

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Abstract

The present invention discloses a method for repairing soil contaminated by heavy metal by utilizing plant. Said method is characterized by that in the soil contaminated by heavy metal the maize can be planted, before harvest at least two additives selected from editic acid or its sodium salt or its potassium salt (EDTA), nitrilotriacetic acid or its sodium salt or its potassium salt (NTA) and citric aid or its sodium salt or its potassium salt (CA) can be applied, and then the aerial part of maize can be harvested so as to attain the goal of repairing soil contaminated by heavy metal.

Description

technical field [0001] The invention belongs to the technical field of phytoremediation of polluted environment, and in particular relates to a method for improving phytoremediation efficiency by applying additives to multi-metal composite polluted soil. Background technique [0002] The increasingly serious soil heavy metal pollution is one of the world's environmental problems that need to be solved urgently. At present, the cultivated land area polluted by heavy metals in my country is nearly 20 million hm 2 , accounting for about 1 / 5 of the total arable land area, and the annual loss due to heavy metal pollution exceeds 100 billion yuan. In view of the shortcomings of traditional heavy metal-contaminated soil remediation technologies such as solidification, landfill, and leaching, which have high costs, damage to soil structure and fertility, and secondary pollution, the phytoremediation technology that has emerged in recent years is characterized by its simple process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10
Inventor 党志周建民
Owner SOUTH CHINA UNIV OF TECH
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