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A method for reducing the migration of pesticides from soil to water environment

A pesticide and soil technology, applied in the field of pesticides, can solve problems such as soil pollution, and achieve the effect of improving adsorption and reducing the scope of pollution

Active Publication Date: 2019-12-10
HAINAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] According to reports, 60% to 90% of the pesticides sprayed directly on the soil or plant surface will eventually enter the soil, causing serious pollution to the soil.

Method used

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  • A method for reducing the migration of pesticides from soil to water environment
  • A method for reducing the migration of pesticides from soil to water environment
  • A method for reducing the migration of pesticides from soil to water environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of water emulsion

[0023] Dissolve the original drug of beta-cyhalothrin in an appropriate amount of xylene, and then add it to a certain amount of APG as an oil phase; measure 4 mL of a 5g / L CSAD solution and add it to ultrapure water as an aqueous phase; Phase and oil phase were mixed and emulsified at 25000r / min for 30min. The mass fractions of beta-cyhalothrin, APG, xylene and CSAD in the water emulsion (CSAD / APG system liquid) were 2%, 4%, 6% and 0.4%, respectively.

[0024] Dissolve the original drug of beta-cyhalothrin in an appropriate amount of xylene, and then add it to a certain amount of APG as the oil phase; take pure water as the water phase; mix the water phase and the oil phase, and emulsify at 25000r / min 30min. The mass fractions of beta-cyhalothrin, APG and xylene in the water emulsion (APG single system liquid) were 2%, 4% and 6%, respectively.

[0025] Among them, the molecular weight of the amphiphilic cholesterol-grafted alginic...

Embodiment 2

[0056] Dissolve the original drug of beta-cyhalothrin in an appropriate amount of xylene, and then add it to a certain amount of APG as an oil phase; measure 4 mL of a 5g / L CSAD solution and add it to ultrapure water as an aqueous phase; Phase and oil phase were mixed and emulsified at 25000r / min for 30min. The mass fractions of beta-cyhalothrin, APG, xylene and CSAD in the water emulsion were 2%, 4%, 6% and 0.04%, respectively. Among them, the molecular weight of the amphiphilic cholesterol grafted alginic acid derivative is 1 million, and the graft ratio of cholesterol is 10%.

Embodiment 3

[0058] Dissolve the original drug of beta-cyhalothrin in an appropriate amount of xylene, and then add it to a certain amount of APG as an oil phase; measure 4 mL of a 5g / L CSAD solution and add it to ultrapure water as an aqueous phase; Phase and oil phase were mixed and emulsified at 25000r / min for 30min. The mass fractions of beta-cyhalothrin, APG, xylene and CSAD in the water emulsion were 2%, 4%, 6% and 0.2%, respectively. Among them, the molecular weight of the amphiphilic cholesterol-grafted alginic acid derivative was 200,000, and the graft ratio of cholesterol was 1%.

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Abstract

The invention provides a method for reducing pesticide migration from soil to a water environment. Alkyl polyglucoside APG and amphiphilic cholesterol grafted alginic acid derivative CSAD serve as emulsifying agents for making original pesticides into emulsion in water. By adoption of the method, adsorption of the pesticides in soil can be improved effectively, the pesticides are prevented from further migration along with flowing water, and accordingly a pesticide contamination range is narrowed, and water environment pollution caused by the pesticides can be controlled from the source.

Description

technical field [0001] The invention relates to the field of pesticides, in particular to a method for reducing the migration of pesticides from soil to water environment. Background technique [0002] According to reports, after spraying pesticides directly on the soil or plant surface, 60% to 90% of the amount will eventually enter the soil, causing serious pollution to the soil. Soil has become the largest "distribution center" for pesticides in the environment. Pesticides entering the soil will undergo a series of physical and chemical changes, one of which is the adsorption and desorption of pesticides by the soil, so that the pesticides are distributed between the adsorption state and the dissolved state, thus affecting the volatilization, migration, diffusion and degradation of pesticides. Therefore, the adsorption / desorption of pesticides in soil is considered to be the main factor governing their fate in the soil-water environment. Surfactants can change the surfa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N25/04A01N25/30
CPCA01N25/04A01N25/30
Inventor 李嘉诚冯玉红余高波肖敦抄
Owner HAINAN UNIV
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