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Chlorpyrifos degradation method

A chlorpyrifos and sample technology, which is applied in the direction of protection devices against harmful chemical agents, can solve the problem of low degradation rate of chlorpyrifos residues, achieve the effect of no secondary pollution, simple process, and elimination of chemical pollutants

Inactive Publication Date: 2009-07-29
INST OF AGRO FOOD SCI & TECH CHINESE ACADEMY OF AGRI SCI
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  • Application Information

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Problems solved by technology

However, the degradation rate of chlorpyrifos residues in fruits and vegetables by existing irradiation methods is low

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1, carry out irradiation degradation to the residual chlorpyrifos in asparagus

[0011] The radiation source used in the present invention is the Institute of Atomic Energy Utilization, Chinese Academy of Agricultural Sciences. 60 Co-γ-ray irradiation source, the dose rate is 0.5kGy / h, and the absorbed dose is calibrated by a silver dichromate dosimeter. The dosimeter is compared with the Chinese Academy of Metrology and Sciences (NDAS), and the error is <±3%.

[0012] The models and places of production of various test instruments used in this embodiment are as follows:

[0013] GC-2010 gas chromatograph (Shimadzu, Japan), with electron capture detector (ECD) and manual injector, GC-2010 gas chromatography workstation (Japan); DB-1 quartz capillary column (30m × 0.25mm × 0.25 μm); RE-2000 type rotary evaporator (Shanghai Yarong Biochemical Instrument Factory); solid-phase extraction device (Supelco, U.S.); Florisil solid-phase extraction column (500mg, 3mL,...

Embodiment 2

[0033] Embodiment 2, carry out irradiation degradation to the residual chlorpyrifos in water

[0034] Adopt gamma ray to carry out irradiation degradation to contain 10mg / L chlorpyrifos aqueous solution and carry out gas chromatographic measurement according to the method identical with embodiment 1, know that when irradiation dosage is 4kGy, degradation rate can reach 95%, show that irradiation can effectively degrade water residual chlorpyrifos.

[0035] The chlorpyrifos aqueous solution that initial concentration is 5.0mg / L, is placed in 60 Irradiation degradation was carried out in a Co-γ-ray irradiation source, and the irradiation doses were 0kGy, 2kGy, 4kGy, 6kGy, 8kGy and 12kGy, respectively. Three repetitions were set for each dose point, and the average value was taken. According to the peak area data in GC-ECD, the degradation rate of chlorpyrifos in aqueous solution under different absorbed radiation doses was calculated, and the calculation formula was:

[0036] ...

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Abstract

The invention discloses a method for degrading chlorpyrifos, which is to degrade a chlorpyrifos-contaminated sample by the irradiation of gamma rays. Co is used as a radioactive substance and the irradiation dose is 0 to 12 kGy and more than 0, preferably 4 to 10 kGy, more preferably 6 to 8 kGy, and optimally 8 kGy. The chlorpyrifos-contaminated sample is chlorpyrifos-contaminated crops, flowers and plants or livestock such as asparagus. The method for degrading chlorpyrifos can be carried out at temperature and normal pressure, is simple in process, free from secondary pollution and high in efficiency, and has a sterilization effect. When the irradiation dose is 8 kGy, the method can degrade nearly 30.0 percent of the residual chlorpyrifos in the asparagus and up to 99 percent of chlorpyrifos in aqueous solutions.

Description

technical field [0001] The invention relates to a method for degrading chlorpyrifos. Background technique [0002] Chlorpyrifos (chlorpyrifos), the trade name is Lesben, and the chemical name is O, O-diethyl-O-(3,5,6-trichloro-2-pyridyl) phosphorothioate. Chlorpyrifos is a broad-spectrum organophosphate insecticide developed and developed by Dow Chemical Company in the United States in 1965. It is widely used in the prevention and control of agricultural and urban pests (Tianqin, Zhou Zhiqiang, Jiang Shuren, etc. Chlorpyrifos in environmental water bodies Research on degradation in medium. Journal of Agricultural Environmental Science, 2005, 24(2): 289~293), has contact killing, stomach poisoning and fumigation effects, and can be effectively used to control rice, wheat, corn, cotton, sugarcane, tea, More than 100 kinds of pests such as borers, leaf rollers, armyworms, scale insects, aphids, leafhoppers and pest mites in fruit trees, flowers and livestock. It has been regi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/172A62D101/28
Inventor 哈益明张庆芳王锋周洪杰李淑荣谢芳
Owner INST OF AGRO FOOD SCI & TECH CHINESE ACADEMY OF AGRI SCI
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