Soil heavy metal passivator and preparation method thereof

Abstract

The invention provides a soil heavy metal passivator. The soil heavy metal passivator comprises, in percentage by weight, 88%-94% of chitosan, 4%-6% of glacial acetic acid and 2%-6% of water. The chitosan can be combined with heavy metal in soil, the passivation function on the heavy metal in the soil is realized, the condition that crops absorb the heavy metal in the soil in the production period is prevented, and the crops are protected from pollution of the heavy metal.

Description

technical field [0001] The invention belongs to the technical field of soil improvement, in particular, the invention relates to a soil heavy metal passivator and a preparation method thereof. Background technique [0002] Soil is one of the main resources that human beings rely on for survival, and it is also an important part of the human ecological environment. However, with the intensification of air pollution and the increase in the types and quantities of agricultural chemicals, soil heavy metal pollution is becoming more and more serious. [0003] Heavy metals refer to metals with a specific gravity equal to or greater than 5.0 and an atomic weight greater than 40, such as Fe, Mn, Zn, Cd, Hg, Ni, Co, Pb, Cr, As, etc. Heavy metals in the soil refer to the entry of heavy metals into the soil due to human activities, which makes the soil heavy metals significantly higher than their original content, resulting in the deterioration of the ecological environment. [0004]...

AI Technical Summary

Problems solved by technology

[0004] In recent years, due to the backward level of ore dressing and smelting technology in mineral development, some mining areas have no environmental protection treatment equipment, and a large amount of waste is directly released into the environment without treatment, resulting in soil heavy metal pollution

Excessive use of chemical fertilizers and pesticides is also another cause of soil heavy metal pollution (although nitrogen and potassium fertilizers contain less heavy metals, but phosphorus fertilizers contain more heavy metals); in addition, the use of pesticides containing lead and organic mercury causes changes in the colloidal structure of the soil , nutrient loss, has a great adverse effect on the yield and quality of crops

[0005] Soil heavy metal pollution will first affect the growth and development of plants, and then affect the yield and quality of crops

For example, the combination of cadmium with sulfhydryl-containing amino acids and proteins will cause the inactivation of amino acids and proteins, and even lead to the death of plants. For example, Cd, through the formation of excessive oxygen free radicals, affects the activity of antioxidant enzymes in plants and destroys cell membrane systems, proteins, and nucleic acids. and other biological macromolecules, inhibiting the synthesis of rice chlorophyll and plant growth, and ultimately brought serious economic losses to the country

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