Method for detecting ten types of organophosphorus pesticides by using magnetic separation-gas chromatography

A technology of organophosphorus pesticides and gas chromatography, which is applied in the field of magnetic separation-gas chromatography to detect ten kinds of organophosphorus pesticides, can solve the problems of high cost, long detection time, cumbersome pretreatment, etc., and achieve low cost, high sensitivity, and simplified The effect of the processing step

Inactive Publication Date: 2014-07-02
SHANDONG AGRICULTURAL UNIVERSITY
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of long detection time, high cost and cumbersome pretreatment in traditional organophosphorus pesticide detection methods, and provide a magnetic solid phase extraction c

Method used

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  • Method for detecting ten types of organophosphorus pesticides by using magnetic separation-gas chromatography

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Embodiment Construction

[0021] Below in conjunction with embodiment, the present invention is further described; Following embodiment is illustrative, not limiting, can not limit protection scope of the present invention with following embodiment.

[0022] The present invention combines magnetic solid-phase extraction technology with gas chromatography to establish trichlorfon, methamidophos, acephate, omethoate, monocrotophos, dimethoate, phosphamide, methyl parathion, mara Thion and chlorpyrifos have highly sensitive detection methods. Its specific embodiment is:

[0023] 1) Preparation of magnetic chitosan:

[0024] Dissolve 0.1mol ferric chloride and 0.2mol ferrous chloride in 100mL of 2.0mol L -1 Hydrochloric acid solution; slowly drop 2.0mol L -1 ammonia water to adjust the pH of the solution to 9.73, and vigorously stirred at room temperature for 2 h; washed with 100 mL of ethanol and water for 5 times each, and vacuum-dried at 40°C to obtain γ-ferric oxide.

[0025] Take 70-90mL of liquid...

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Abstract

The invention relates to a method for detecting ten types of organophosphorus pesticides by using magnetic separation-gas chromatography. The method is used for quickly detecting ten types of organophosphorus pesticides (dipterex, methamidophos, acephate, omethoate, moncrotophos, dimethoate, phosphamidon, parathion-methyl, malathion and chlorpyrifos) based on combination of solid-phase extraction, magnetic separation and the gas chromatography. The method comprises the following steps: preparing a magnetic solid-phase extraction agent, establishing a combination system of the magnetic separation and the gas chromatography, and detecting the organophosphorus pesticides in objects to be detected. A method capable of quickly separating and detecting ten types of organophosphorus pesticides at high sensitivity simultaneously is established by taking prepared magnetic chitosan microspheres with high absorption performance on the ten types of organophosphorus pesticides such as dipterex and the like as adsorption functional materials and using combination of the solid-phase extraction, magnetic separation and the gas chromatography. The method is simple in experimental operation, high in detection sensitivity, low in cost and applicable to detection of residues of ten types of organophosphorus pesticides such as trace dipterex and the like in all products.

Description

technical field [0001] The invention relates to a magnetic separation-gas chromatography detection method for ten kinds of organophosphorus pesticides, belonging to the technical field of food safety detection. Background technique [0002] Organophosphorus pesticides are a class of high-efficiency, broad-spectrum chemical insecticides with many varieties, high efficacy, and wide application. They have been widely used in agricultural production and have become one of the main sources of food pollution. Organophosphorus pesticides enter the organism and have an inhibitory effect on cholinesterase in the organism. Inhibition of cholinesterase makes it lose the ability to decompose acetylcholine, resulting in the accumulation of acetylcholine, causing nerve dysfunction, and resulting in damage to the body. Long-term consumption of agricultural products with a trace amount of organophosphorus pesticide residues exceeding the standard may cause chronic poisoning in humans, leadi...

Claims

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Application Information

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IPC IPC(8): G01N30/02
Inventor 徐志祥唐清华王玺龙
Owner SHANDONG AGRICULTURAL UNIVERSITY
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