Preparation method of activator for promoting remediation of Cd-contaminated farmland soil by means of Amaranthus hypochondriacus

Abstract

The invention provides a preparation method of activator for promoting remediation of Cd-contaminated farmland soil by means of Amaranthus hypochondriacus. Absorption of Cd in the soil by means of theAmaranthus hypochondriacus is promoted through application of monopotassium phosphate (0.1 g*kg<-1>), EDTA (2 mmol*kg<-1>) and citric acid (4 mmol*kg<-1>) in the optimal proportion. The method has the advantages that test data indicate that after hyperaccumulators, namely Amaranthus hypochondriacus, are used for remedying the slightly- Cd-contaminated farmland soil and the activator (EDTA and citric acid) is added, the Cd enrichment ability of root, stem and leaf tissue of the Amaranthus hypochondriacus is 2.10, 1.84 and 2.76 times of that before addition of a remediation agent, three crops of Amaranthus hypochondriacus can be planted each year, the removal rate for every mu of land ranges from 6% to 15% under the condition that the remediation agent is added, and the remediation cost isabout 14,000 yuan conservatively, so that sticktight has the better application prospect in remediation of Cd contamination of farmland soil. The activator has the characteristics that thorough remediation is realized, the adaptability is high, secondary pollution is avoided, the cost is low, the application method is simple and the like.

Description

technical field [0001] The invention relates to a preparation method of an activator for promoting grain amaranth to restore cadmium-contaminated farmland soil, and belongs to the technical field of heavy metal soil pollution restoration. Background technique [0002] The survival and development of human beings are inseparable from the soil. In recent years, due to the large-scale application of industrial "three wastes" and Cd-containing fertilizers, a large amount of heavy metal Cd has entered the soil, resulting in increasingly serious Cd pollution in the soil. Cd is the most toxic and mobile heavy metal. The strong one accumulates in the human body through the food chain and causes harm. Currently in our country there are about 1×10 8 hm 2 Cultivated land, of which nearly 1 / 5 of the cultivated land is polluted to varying degrees, and the annual agricultural loss reaches 1×10 11 yuan or more. At the same time, other ecological and environmental problems caused by soi...

AI Technical Summary

Problems solved by technology

Based on the limited absorption efficiency of heavy metals by plants, the factors that limit the absorption of heavy metals by plants mainly include the low solubility of heavy metal pollutants in soil, poor migration ability, and low transport efficiency of heavy metals from underground to aerial parts in plants.

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