Eluent for a pesticide-DDT in black soil and eluting method of eluent

A technology of eluent and DDT, applied in the field of eluent for pesticide DDT in black soil, can solve problems such as differences in implementation conditions, and achieve the effects of reducing interfacial tension, promoting the formation of micelles, and using a simple and easy method.

Inactive Publication Date: 2015-04-29
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some domestic researches on surfactant remediation technology for polluted soil have been carried out, but the implementation conditions of this technology vary greatly due to soil types. At present, there is still a lack of elution and remediation technology for DDTs in black soil soil in China

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: The elution effect of low-concentration DDTs polluted simulated soil

[0026] The composition of the soil eluent is: the mass ratio of Tween 60 and sodium lauryl sulfate is 2:1, the total concentration of the two is 3000mg / L, and the K of 1.0g / L 2 CO 3 , 2.0mol / L n-butanol, the solvent is water. A certain amount of DDT was dissolved in dichloromethane solvent, and added to the soil sample to prepare a DDT simulated contaminated soil sample with a concentration of 10mg / kg. Accurately weigh 4.0g of DDTs-contaminated soil sample into a 100ml Erlenmeyer flask, add 40ml of prepared soil eluent and mix well (solid-to-liquid ratio 1:10), seal and wrap the conical flask with aluminum foil The bottle was placed in an air bath constant temperature shaker, and shaken at 200 r / min in the dark for 4 hours at 30°C. After the mud-water separation, the soil was washed with deionized water and then air-dried naturally. The soil eluate was centrifuged at a speed of 4000r / m...

Embodiment 2

[0027] Example 2: Elution effect of high concentration DDTs polluted simulated soil

[0028] The composition of the soil eluent is: the mass ratio of Tween 60 and sodium lauryl sulfate is 3:1, the total concentration of the two is 4000mg / L, and the K of 1.0g / L 2 CO 3, 2.0mol / L n-butanol, the solvent is water. A certain amount of DDT was dissolved in dichloromethane solvent, and added to the soil sample to prepare a DDT simulated contaminated soil sample with a concentration of 100mg / kg. Accurately weigh 4.0g of DDTs-contaminated soil sample into a 100ml Erlenmeyer flask, add 60ml of prepared soil eluent and mix thoroughly (solid-to-liquid ratio 1:15), seal and wrap the conical flask with aluminum foil The bottle was placed in an air bath constant temperature shaker, and shaken at 200 r / min in the dark for 6 hours at 30°C. After the mud and water are separated, wash again in the same way, and the soil is washed with deionized water and air-dried naturally. The soil eluate w...

Embodiment 3

[0029] Example 3: The elution effect of DDTs polluted site soil

[0030] The composition of the soil eluent is: the mass ratio of Tween 60 and sodium lauryl sulfate is 3:1, the total concentration of the two is 4000mg / L, and the K of 1.0g / L 2 SiO 3 , 2.0mol / L n-propanol, the solvent is water. DDTs-contaminated soil samples were polluted soil from the former site of a pesticide production enterprise in Northeast China. It was determined that the concentration of DDT that can be extracted with n-hexane in the soil was 16.31mg / kg, the concentration of DDD was 5.17mg / kg, and the concentration of DDE was 6.94mg / kg. The total concentration of DDTs was 28.42mg / kg. Accurately weigh 8.0g of DDTs-contaminated soil sample and put it into a 200ml Erlenmeyer flask, add 100ml of prepared soil eluent and mix well (solid-to-liquid ratio 1:12.5), seal and wrap the conical flask with aluminum foil The bottle was placed in an air bath constant temperature shaker, and shaken at 200 r / min in th...

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PUM

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Abstract

The invention discloses an eluent for a pesticide-DDT in black soil and an eluting method of the eluent. The eluent disclosed by the invention is composed of a non-ionic surfactant, an anionic surfactant, inorganic salt, an organic additive and a solvent. The specific composition of the eluent is as follows: the mass ratio of the non-ionic surfactant-twain 60 to the anionic surfactant-sodium dodecyl sulfate in the eluent is (1-3) to 1, the total concentration of the two is 3000-4000mg / L, the concentration of the inorganic salt-K2SiO3 or K2CO3 in the eluant is 1.0g / L, the concentration of the organic additive-n-propanol or n-butyl alcohol in the eluent is 1.0-2.0mol / L, and the solvent is water.

Description

technical field [0001] The invention belongs to the technical field of soil organic pollution treatment, and in particular relates to an eluent for the pesticide DDT in black soil and an eluting method thereof. Background technique [0002] In recent years, the intensification of human activities and irrational land use have led to the black soil, which has always been considered "pure land", is facing a crisis of environmental pollution. In particular, a large amount of pesticides remain in the soil environment of chemical plants and pesticide factories in the urban and suburban areas, and spread to the groundwater and surrounding areas, posing a non-negligible threat to the health of the local population and the ecological environment. [0003] The organochlorine pesticide DDTs (DDTs) has been widely used in agricultural pest control since the 1950s in my country, and is still used as an intermediate of dicofol, an antifouling paint additive and for disease control. Due t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02
Inventor 肖鹏飞
Owner NORTHEAST FORESTRY UNIVERSITY
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