Production method for significantly reducing cadmium content in rice

Abstract

The invention discloses a production method for significantly reducing cadmium content in rice. An automatic dilution adjustment method of a bifurcated valve pipette is used to conduct the two-stage dilution of an acidic soil conditioner, and the proportion of the acidic soil conditioner is diluted constantly. Arable soil is treated by means of irrigation and soaking, and meanwhile, the use of the soluble acidic soil conditioner can prepare a whole ion solution after dissolution in water. A large number of hydroxyl ions are provided in rice arable land by specific means of dilution, irrigation, soaking, raking and other measures. Moreover, the hydroxyl ions permeate the surroundings of every rice root and react with the cadmium ions of the soil to form cadmium hydroxide precipitation (Cd(OH)2). The cadmium ions are converted into insoluble compound molecules and cannot be absorbed by the rice roots, thus the goal of reducing the content of cadmium in rice is achieved. The method has the advantages of convenient use and evenly distribution.

Description

technical field [0001] The invention belongs to the field of prevention and control of heavy metal pollution of agricultural products, and relates to a method for reducing cadmium content in agricultural products, in particular to a production method for significantly reducing cadmium content in rice. Background technique [0002] Cadmium (Cd) is a harmful heavy metal element. After being absorbed by the human body, it is mainly combined with sulfhydryl-containing low molecular weight plasma proteins to form metallothioproteins, which are selectively stored in the liver, kidney, spleen, pancreas, thyroid, and adrenal glands along with the blood. And testis, and accumulation is very strong. Long-term absorption or excessive absorption of cadmium by the human body can lead to bone pain. In addition, medical research in recent years has shown that cadmium can cause a series of chronic damages, such as high blood pressure, testicular damage, carcinogenesis, teratogenicity, anem...

AI Technical Summary

Problems solved by technology

[0006] (1) The application of alkaline solid substances such as lime, plant ash, and sepiolite is time-consuming and labor-intensive, and it is difficult to apply evenly

[0007] (2) Lime, plant ash, sepiolite and other solid particles are insoluble compounds, which will precipitate in large quantities in water. At the same time, when the soil is mixed with soil particles, it is wrapped and blocked by a large number of soil particles, so that alkaline substances and The probability of root contact is limited, and the acidity adjustment effect is very limited. Usually, it needs to be added in large quantities, but this can lead to soil calcification and compaction, and increase the production costs of materials and labor.

[0008] (3) The chemical composition of solid substances such as lime, plant ash, and sepiolite are inorganic salt compounds such as calcium carbonate and potassium carbonate. After being applied to the ground, they will chemically react with various inorganic salt components in the soil, which can effectively provide hydrogen The amount of oxygen ions is very limited, and the aging time is very short, resulting in poor and unstable cadmium reduction effect

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