Method for hindering absorption of heavy metal by plant

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...

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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 essential elements in the human body, was found to inhibit the absorption of heavy metal elements by plants, but this is only at low doses. Once the selenium element in the plant growth substrate is excessive, it will be toxic to plants

At present, there are few reports on the reasonable concentration range of selenium to inhibit the absorption of heavy metals in plants, which limits the practical application of selenium.

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