Method for hindering absorption of heavy metal by plant

A plant absorption and heavy metal technology, applied in the field of chemical remediation, can solve the problems of adverse effects on soil physical and chemical properties, less treatment of heavy metal polluted soil, phytotoxicity, etc., and achieve the effect of promoting photosynthesis, promoting plant growth, and inhibiting absorption

Inactive Publication Date: 2013-02-27
AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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Problems solved by technology

However, long-term application of such materials has adverse effects on soil physical and chemical properties.
[0003] In recent years, apatite and red mud have attracted more and more attention due to their extensive tolerance and adsorption and fixation effects on various metal cations. There are relatively few studies on the treatment of heavy metal-contaminated soil.
In addition, selenium, one of the essent...

Method used

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  • Method for hindering absorption of heavy metal by plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take 6 parts of 2kg contaminated soil respectively, and the contents of cadmium, copper, lead, zinc and arsenic are shown in Table 1. Regulate soil moisture to 50%, add base fertilizer in every portion of soil: 200mg / kg nitrogen (ammonia nitrate), 30mg / kg phosphorus (calcium hydrogen phosphate), 150mg / kg potassium (potassium sulfate).

[0016] Each of the 3 parts of the soil was treated as follows: add 50 g of red mud and hydroxyapatite passed through a 100-mesh sieve, and then add 10 ml of selenium solution with a concentration of 0.5 mg / L, wherein the solute is sodium selenite. Then the soil and the additives are thoroughly mixed by mechanical stirring. The remaining 3 soils were the control without additives.

[0017] Water 50-100ml of 6 parts of soil every day to maintain its moisture content. After 10 days, sow 7 soybean seeds with full grains and uniform size in each part of the soil. Cultivate 6 pots of soybeans. Keep the temperature, light, and moisture condi...

Embodiment 2

[0027] Get 3 parts of 2kg contaminated soil, its properties are consistent with those described in Example 1, adjust its water content according to the method described in Example 1, and add base fertilizer. Then add additives to 3 parts of soil respectively: 100 g of red mud and hydroxyapatite passed through a 100 mesh sieve, and then add 10 ml of selenium solution with a concentration of 1 mg / L, wherein the solute is sodium selenite. Other processing steps are as embodiment 1. The control treatment in Example 1 was used as the test control.

[0028] The contents of heavy metals in the harvested plants are shown in Table 4, and the available contents of heavy metals in the soil are shown in Table 5.

[0029] Table 4 Heavy metal content in soybean (mg / kg)

[0030] the element

Cadmium

copper

lead

zinc

arsenic

Dealing with the aboveground

1.39±0.64

13.1±2.6

3.78±1.03

64.9±1.4

0.29±0.10

Compared with above ground ...

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Abstract

The invention discloses a method for hindering the absorption of heavy metal by a plant. Modifying agent is applied to soil; the modifying agent is the combination of red mud, apatite and selenium; and the dosage of the red mud, the apatite and the selenium is as follows: 5-100g of red mud, 5-100g of apatite and 0.5-1mg of selenium are applied to 1kg of soil. According to the application of the combined modifying agent, the effective state of heavy metals in the soil can be lowered to achieve a purpose of fixedly precipitating the heavy metals so as to greatly lower the content of the heavy metals, such as cadmium, copper, lead, zinc and arsenic in plants, the plant biomass can be increased, and a technical guarantee is provided for the grain production safety of a heavy metal contaminated region.

Description

technical field [0001] The invention relates to a chemical restoration technology for heavy metal polluted environment. Background technique [0002] Because of its easy implementation, short period and low cost, chemical remediation has become a commonly used land remediation technology in the development of agricultural production activities in heavy metal polluted areas in my country. In terms of the choice of chemical additives, the most commonly used alkaline materials such as lime and blast furnace slag can reduce the adverse effects of heavy metals on plant growth by adjusting the pH of the soil so that more heavy metals can be converted into precipitated forms. However, long-term application of such materials has adverse effects on soil physical and chemical properties. [0003] In recent years, apatite and red mud have attracted more and more attention due to their extensive tolerance and adsorption and fixation effects on various metal cations. There are relative...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 冯人伟刘仲奇丁永帧王瑞刚郭军康宋正国
Owner AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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