A kind of soil cadmium passivator and its preparation method and the application of reducing tobacco cadmium

Abstract

The invention provides a soil cadmium passivator. The soil cadmium passivator is prepared from the following raw materials in parts by weight: 200 to 400 parts of red mud and 15 parts of phosphate fertilizer. According to the soil cadmium passivator, the content of effective cadmium in the soil of a tobacco field and the content of the cadmium in tobacco leaves are reduced by utilizing the combination of the red mud and phosphorus. The invention provides the soil cadmium passivator which is low in cost and convenient to collect and has easiness in process, and a preparation method and an application method for the soil cadmium passivator. The red mud serving as a raw material of the soil cadmium passivator belongs to waste recycling; the overall cost is very low; the raw materials are pretreated very simply and easily; the passivator can be obtained by simply draying, crushing, screening and mixing without specific treatment processes such as modification by a chemical method; the process is simple. The application method of the soil cadmium passivator is also simple; the soil cadmium passivator has good effects of passivating soil cadmium and reducing the cadmium of the tobacco leaves, has specificity and wide application range, and cannot generate secondary pollution to soil and cannot influence the quality and yield of crops.

Description

technical field [0001] The invention belongs to the field of chemistry, relates to soil pollution control technology in the field of environmental protection, in particular to a technology for reducing tobacco cadmium. Background technique [0002] Cadmium is one of the heavy metal elements that are highly toxic to plants and humans in the environment. Heavy metal pollution is characterized by wide range, long duration, hidden pollution, inability to be biodegraded, and continuous enrichment in organisms through the food chain. [0003] Tobacco is a cadmium-enriched plant, and its cadmium accumulation is more than 10 times higher than that of ordinary plants. Tobacco did not significantly absorb and accumulate other heavy metals than other plants. Therefore, the key to the quality and safety of tobacco heavy metals is cadmium. The development of methods to reduce tobacco cadmium has become a hot spot for researchers. [0004] Although some researchers have developed a met...

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Problems solved by technology

According to the literature, about 150,000 kg of soil per acre of plow layer, the soil moisture content is 20% when suitable for cultivation, so the application amount of red mud and apatite in the composition applied per acre of plow layer soil in the above-mentioned patents all reaches 937.5-18750 kg, Application rate reaches 4687.5kg / mu and 9375kg / mu in two embodiments, and raw material is too big, will be restricted in practical application, if field application, one mu of land will be applied into red mud and apatite altogether 9 tons or more than 18 tons, plus the amount of application of other raw materials in the composition, the difficulty of implementation can be imagined. Therefore, the above-mentioned patent is only a theoretical level research for indoor pot experiments, and the actual use is quite difficult, so it needs to be proposed. A new method for reducing available cadmium in tobacco field soil and cadmium in tobacco leaves, providing a passivator with low cost, convenient collection and simple process

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