Passivating agent for inhibiting absorption of rice and reducing heavy metal content of rice, and application and use method thereof

Abstract

The invention relates to the field of environmental chemistry, and particularly discloses a passivating agent for inhibiting rice from absorbing and reducing the heavy metal content of rice, and application and a use method thereof. The passivating agent is formed by mixing the following raw materials in parts by weight: 10-20 parts of phosphate; 5-10 parts of an inorganic alkaline substance; 5-10 parts of calcium polysulfide; 10-20 parts of a silicon fertilizer; 10-20 parts of an inorganic flocculant; 15-25 parts of iron oxide; and 10-20 parts of manganese oxide. The passivating agent is applied to a rice field containing heavy metal, and the heavy metal is one or a combination of more of lead, cadmium, arsenic, mercury and chromium. The use method of the passivating agent comprises the following steps: S1, intertilling a rice field, and scattering the passivating agent at the same time; and S2, soaking in water. The passivating agent disclosed by the invention has the advantages of inhibiting the heavy metal absorption of the rice and reducing the heavy metal content in the rice.

Description

Technical field [0001] The present application relates to the field of environmental chemistry, and more particularly, it relates to a passivation agent and its application and use of rice absorption and reducing rice heavy metal content. Background technique [0002] Rice is one of the main food crops in the world, and more than half of the world has a staple food. During the growth of rice, nutrients are needed from rice fields. [0003] However, due to the increasingly deteriorated soil weight metal contamination, heavy metals such as lead, cadmium, arsenic, mercury, and chromium containing contaminated rice fields have strong chemical activity, but also affect rice production, but also easy to be absorbed by rice. Residual in the rice, harm the life and health of human life through the food chain, bringing significant hidden dangers and threats to people. Inventive content [0004] In order to inhibit the absorption of heavy metals, reduce the heavy metal content in rice, th...

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Problems solved by technology

[0003] However, due to the deteriorating soil heavy metal pollution, heavy metals such as lead, cadmium, arsenic, mercury, and chromium contained in the polluted rice fields have strong chemical activity and bioavailability, which not only affect the yield of rice, but are also easily absorbed by rice. Residues in rice, endangering human life and health through the food chain, and bringing major hidden dangers and threats to people's lives

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