Researchers selected soils containing more than 10 times the cadmium content for the remediation experiment. Among the 6 rice varieties planted, except for one type of rice with a cadmium content of 0.28 mg/kg, the other five were below the national food hygiene standard limit of 0.2 mg/kg. . Heavy metal content of "cadmium rice" is frightening. Yesterday, the reporter got good news from the Geological Experimental Testing Center of the Geological Bureau of Guangdong Province, and the contaminated soil that produced “cadmium rice†was saved. According to Liu Wenhua, chief engineer of the Geological Laboratory Test Center of the Geological Bureau of Guangdong Province, the center’s research team has successfully developed Mont-SH6, a heavy metal deactivator for soils, after more than 10 years of research. The main toxic metals in the soil are cadmium, lead, mercury, and copper. Zinc has a strong adsorption capacity, and has a strong effect of remediation of heavy metal pollution in the soil. The effective rate of “cadmium reduction†is more than 90%, and the cost of material preparation is also greatly reduced. The cost of repairing a single cadmium-contaminated soil is only 2,000 yuan to 3,000 yuan Liu Wenhua said: "At present, the cost of remediation of one acre of 'cadmium-rice' contaminated soil is about 30,000 yuan. However, if we develop new materials, the cost of repairing one acre of 'cadmium-rice' contaminated soil can be reduced if large-scale industrial production is carried out. From 2000 yuan to 3,000 yuan, 90% reduction is only one-tenth of the current cost." It is reported that during the acid rain simulation test, the research team of the Guangdong Provincial Geological Test and Test Center discovered and confirmed that the humus clay layer in the agricultural soil layer has a certain buffer capacity for external acidic substances and has a strong ability to adsorb heavy metal elements. After thousands of experiments, researchers have screened and developed Mont-SH6 repair materials with strong adsorption, stability, and passivation capabilities for cadmium, lead, and other major toxic heavy metals from dozens of modified clay materials. The saturated adsorption of cadmium in aqueous solution can be increased to 140.85 mg/g, the saturated adsorption of lead can be increased to 270.27 mg/g, and many experiments prove that the product is stable after drying at 100°C for one day. . This material has no toxic side effects and has a good long-acting fixed passivation effect on heavy metals in the soil. After several optimizations and upgrades, the cost of material preparation is greatly reduced, and it is suitable for large-scale promotion. The cadmium content exceeds 10 times the amount of cadmium in rice after the repair After the researchers completed the development of Mont-SH6, they applied the research on the remediation of the production of "Cadmium rice" origin. Researchers selected soils containing more than 10 times the cadmium content and conducted two-stage rice pot restoration experiments. The remediation results showed that the content of heavy metal cadmium in the rice produced was reduced by more than 90%. Among the 6 rice plants planted, except for one type of rice With the cadmium content of 0.28 mg/kg, the other 5 species were below the national food hygiene standard value of 0.2 mg/kg. After application of Mont-SH6, the contents of cadmium in simulated paddy field water, cadmium in water-soluble and ion-exchanged forms decreased by more than 50%. According to Feng Chao, director of the Geological Testing Research Center of Guangdong Province, the center will actively promote the application of Mont-SH6, through participation in the "Special Research Projects of the Ministry of Land and Resources, Public Welfare Industries", "2015 Guangdong Provincial Science and Technology Support Plan" and "Guangdong The special project for geological research of the Provincial Department of Finance, etc., will further promote the development of Mont-SH6. R&D will not affect the normal production of crops but also remediation of contaminated soil. Zhejiang minmetals huitong import and export Co., Ltd , https://www.zjminmetals.com