Rape stalk soil cadmium passivator, as well as preparation method and application thereof

Abstract

The invention provides an application of rape stalks to reducing the content of effective cadmium in soil. The rape stalks as raw materials are collected, baked or dried in the sun, crushed and sieved to 30 to 100 meshes by a standard sieve to obtain a granular rape stalk soil cadmium passivator, and the rape stalk soil cadmium passivator is applied to the surface soil by using an application method of broadcasting application, furrow application or hole application. According to the preparation method, by utilizing the adsorption principle of the rape stalks to prepare a vega soil cadmium special passivator, the content of the effective cadmium in the soil and the content of cadmium in tobaccos which grow in the soil can be effectively reduced. The rape stalks as the raw materials belong to the field of agricultural waste recycling with low cost, have a high passivating effect on the cadmium in the soil and a high reducing effect on the cadmium in the tobaccos, have the advantages of specificity and wide application range and cannot cause secondary pollution to the soil or 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] Heavy metal pollution is characterized by a wide range, long duration, hidden pollution, inability to be biodegraded, and possible continuous enrichment in organisms through the food chain. Cadmium is one of the heavy metal elements in the environment that are highly toxic to plants and humans. Existing methods for reducing heavy metals in soil include physical remediation technology, chemical remediation technology and biological remediation technology, among which the key to chemical remediation technology is to screen suitable chemical modifiers. Chemical repair agents have chelation, complexation, adsorption, alkalization, antagonism, etc. as their working principles. The principle of action is to start from the source and r...

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Problems solved by technology

[0003] Now there is a method of chemical remediation in the application of heavy metals in tobacco field soil (CN201110413145.0), but the raw materials are relatively complicated, and a new method for reducing the available cadmium in tobacco field soil and cadmium in tobacco leaves needs to be proposed to provide a Passivating agent with low cost, convenient collection and simple process

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