Application of polyacrylamide in amaranthus hypochondriacus for restoring soil polluted by heavy metal cadmium

Abstract

The invention relates to plant chelating and inducing plant restoring technology for soil polluted by heavy metal cadmium and discloses an application of a chelating agent (namely APAM (Anionic polyacrylamide)) for reinforcing amaranthus hypochondriacus to restore the soil polluted by heavy metal cadmium. The specific steps are as follows: the amaranthus hypochondriacus is planted in the soil polluted by the heavy metal cadmium, and 8.33-33.33Kg of chelating agent (APAM) is applied in each 666.7m<2> of the soil polluted by cadmium before 15-25 days when the amaranthus hypochondriacus is harvested, the specific mode is as follows: the APAM is dissolved in water and is applied in the soil in the soil surface spaying manner so as to improve the biological effectiveness and promote the capability of the plant to absorb the heavy metal cadmium, so that the purposes of increasing the accumulation amount of the heavy metal cadmium and improving the heavy metal cadmium extracting efficiency are achieved. The amaranthus hypochondriacus has the advantages of large organism amount, cadmium forcing resistance and uniform gathering property and the like, and the chelating agent (APAM) has the function of activating the heavy metal cadmium and is low in cost, and due to the combination of the amaranthus hypochondriacus and the APAM, the restoring efficiecy of the amaranthus hypochondriacus is improved, and the capability of restoring the soil polluted by the heavy metal cadmium is enhanced.

Description

technical field [0001] The invention relates to the technical field of remediation of heavy metal pollution in the environment, in particular to the application of APAM in repairing soil polluted by heavy metal cadmium with grain amaranth. Background technique [0002] Soil heavy metal pollution is one of the serious environmental problems facing the world today. Cadmium is a non-essential nutrient element that is highly toxic to plants and animals at low concentrations. It is often transmitted through the food chain and causes many serious diseases in humans. Since the 20th century, due to human activities such as mining, smelting, and fertilization, the Cd content in soil has increased significantly. In my country, with the development of industrial and agricultural production and the urbanization of rural areas, the spread of heavy metal Cd pollution in soil has gradually deepened. Therefore, the remediation of Cd-contaminated soil has become an urgent problem to be sol...

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Problems solved by technology

[0004] In recent years, phytoremediation technology has become one of the research hotspots in the remediation of heavy metal pollution. Compared with other remediation technologies, it has the characteristics of low cost, easy operation and management, and no secondary pollution. However, most of the cadmium-enriched Plants have weak reproductive ability, slow growth, and small aboveground biomass, which are limited in practical application; in addition, most of the heavy metals in the soil are combined with solid phases and are difficult to be absorbed and utilized by restoration plants, resulting in low restoration efficiency and restoration. longer time

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