A method for remediating SN polluted soil by using the flower plant mirabilis

Abstract

A Sn polluted soil restoration method utilizing a flower plant Mirabilis jalapa. Cultivated Mirabilis jalapa seedlings are planted in Sn polluted soil, and absorption and metabolism functions of the Mirabilis jalapa are utilized to absorb, enrich and stabilize the Sn pollutants in the soil; when seeded, the Mirabilis jalapa plants are moved out from the soil with roots. An objective of removing Sn pollutants in the soil can be realized by repeating the steps. The invention has advantages that the Mirabilis jalapa plants show good Sn resistance during a whole growth phase containing growth, development, anthesis and fruiting; and Sn accumulated on an aboveground part is higher than 70mg/kg. The Mirabilis jalapa plants have a transfer coefficient greater than 1.0 under each concentration gradient condition, and partial characteristics of a Sn super accumulated plant. The method has small engineering work load, low treatment cost, environment beautifying effect without destroying basic physical and chemical properties of the soil, and is propitious to large scale popularization and application; besides, the screening of Sn super accumulated plant has great significance for establishing a plant restoration germplasm resource database and resource recovery.

Description

technical field [0001] The invention relates to a treatment method for tin (Sn) polluted soil, in particular to a method for repairing Sn polluted soil by using flower plant mirabilis (Mirabilis Jalapa L.). Background technique [0002] Tin (Sn), a slightly blue low-melting metal element, is divalent or tetravalent in the compound and will not be oxidized by air. It is mainly composed of dioxide (cassiterite) and various sulfides (such as sulfur cassiterite) form. Sn is one of the famous "hardware" - gold, silver, copper, iron, tin. Metal Sn is soft and flexible, with a melting point of 231.89°C and a boiling point of 2260°C. In the air, the surface of Sn forms a tin dioxide protective film and is stable, and the oxidation reaction is accelerated under heating; Sn reacts with halogen to form tin tetrahalide; it can also react with sulfur; Sn is stable to water and can slowly dissolve in dilute acid. It dissolves quickly in concentrated acid, and can also dissolve in stron...

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Problems solved by technology

[0007] At present, most of the researches focus on the toxicity of organotins and their pollution to the ocean, as well as the occurrence and distribution of organotins; in terms of phytoremediation, the main researches are on the use of phytoremediation of heavy metals such as Cd, Pb, Zn, Cr, As or pollution from petroleum hydrocarbons. Soil [see literature: Pendergrass A, Butcher D J, 2006.Up take of lead and arsenic in food plants grown in contaminated soil from Barber Orchard N C.Microchemical Journal, 83(1):14~16; Zhineng Zhang, Qixing Zhou, Shengwei Peng et al, 2010. Remediation of petrole

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