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Repair method of dipterex pesticide contaminated soil

A technology of pesticide-contaminated soil and a remediation method, which is applied in the field of remediation of trichlorfon pesticide-contaminated soil, and achieves the effects of simple and easy method, large-scale implementation, and low cost.

Inactive Publication Date: 2013-04-03
SUZHOU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, there has been no report on remediation of trichlorfon-contaminated soil at home and abroad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] (1) Homogeneous catalyst Fe 2+ Solution preparation: Weigh 0.392g ferrous ammonium sulfate in a beaker, add water to dissolve, add 0.01mol / L hydrochloric acid 10mL, transfer to a 100ml volumetric flask, add water to volume, shake well to obtain a concentration of 10mmol / L L ferrous homogeneous catalyst.

[0019] (2) Preparation of oxidant solution: measure 6ml of 30% hydrogen peroxide, put it in a 100ml volumetric flask, add water to the volume to get c=0.5mol / L H 2 o 2 solution.

[0020] (3) Preparation of trichlorfon solution: Weigh 0.286g of trichlorfon with a content of 90%, add it to a 100ml beaker to dissolve, then transfer to a 100ml volumetric flask, and dilute to obtain a concentration of 2570mg / L of trichlorfon. Bug solution.

Embodiment 1

[0021] Example 1 Add 100g of soil (dried at 105°C for 10h), 125ml of water, and trichlorfon solution into the beaker to make the content 128mg / Kg. Then, add the above-mentioned homogeneous catalyst (Fe 2+ Solution) 10ml, add above-mentioned oxidizing agent (H 2 o 2 ) solution, add 9ml of 2.4mol / L hydrochloric acid to ensure that the final pH value is around 3.0, add water to make the total volume of the aqueous phase 200ml, mix well and let it stand for degradation. Extract with dichloromethane every 24 hours, and then use 4-(4-nitrobenzyl)pyridine to develop color to measure its degradation rate. After 12 days, the degradation rate of trichlorfon reached 92.4%.

Embodiment 2

[0022] Example 2 Add 100g of soil (dried at 105°C for 10h), 125ml of water, and trichlorfon solution into the beaker to make the content 257mg / Kg. Then, add the above-mentioned homogeneous catalyst (Fe 2+ Solution) 10ml, add above-mentioned oxidizing agent (H 2 o 2 ) solution, add 9ml of 2.4mol / L hydrochloric acid to ensure that the final pH value is around 3.0, add water to make the total volume of the aqueous phase 200ml, mix well and let it stand for degradation. Extract with dichloromethane every 24 hours, and then use 4-(4-nitrobenzyl)pyridine to develop color to measure its degradation rate. After 6 days, extract 5ml of the supernatant of the soil, then add 5ml of the above-mentioned hydrogen peroxide solution, mix well and make it continue to degrade. After 12 days, the degradation rate of trichlorfon reached 93.0%.

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Abstract

The invention discloses a repair method of dipterex pesticide contaminated soil. As an optimal specific implementation scheme, the repair method comprises the steps of: (1) at least dissolving enough amount of soluble ferrite and enough quantity of a soluble oxidant respectively in water to obtain solutions; and (2) adding the soluble ferrite solution and the soluble oxidant solution as well as an acid solution to a dipterex pesticide contaminated soil, enabling the pH value of the formed mixed reaction system to be about 3, and standing the mixed reaction system until a dipterex pesticide in the soil is completely degraded. Further, the step (2) can also include the steps of: monitoring the content of dipterex pesticide in the mixed reaction system at regular time, and supplementing the soluble oxidant solution to the mixed reaction system. The repair method can effectively degrade dipterex and realize the repair of the contaminated soil, and is simple and easy to implement, low in cost and beneficial to scale implementation.

Description

technical field [0001] The invention relates to a method for repairing soil polluted by organic pesticides, in particular to a method for repairing soil contaminated by trichlorfon pesticides. Background technique [0002] my country is a large agricultural country, and the use of pesticides effectively guarantees the normal growth of crops. Trichlorfon (Trichlorfon, chemical name O, O-dimethyl-(2,2,2-trichloro-1-hydroxyethyl) phosphonate), is an organic Phosphorus broad-spectrum insecticide can prevent and control chewing mouthparts pests, livestock parasites and hygiene pests on crops such as rice, wheat, vegetables, tea trees, fruit trees, mulberry trees and cotton, and is widely used. However, with extensive and long-term use, the accumulated pesticide residues have become a major public hazard. It not only pollutes the soil, but also affects the export of agricultural products in our country, and seriously threatens people's health. Therefore, the remediation of conta...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 刘守清裴晓哲
Owner SUZHOU UNIV OF SCI & TECH
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