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Method for detecting pesticide residue amount of chlorpyrifos in vegetables

A chlorpyrifos pesticide and residue technology, applied in the direction of electrochemical variables of materials, can solve the problems of low sensitivity, low accuracy, easy to be affected by interfering substances, and many experimental interference factors, and achieve good selectivity, strong influence ability, low cost effect

Inactive Publication Date: 2015-03-25
杨秋慧 +1
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  • Description
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Problems solved by technology

[0004] Spectrometry requires a special chromogenic agent, the sensitivity and accuracy are not high, there are many test interference factors, the stability is poor, the sample consumption is large, and it is not affected by the turbidity and color of the system
[0005] The chromatographic methods for determining chlorpyrifos include gas chromatography (GC), high performance liquid chromatography (HPLC), gas chromatography-mass spectrometry (GC-MS) and high performance liquid chromatography-mass spectrometry (HPLC-MS). There are defects such as long detection time, slow response, poor continuity, high instrument cost, and susceptible to interference

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  • Method for detecting pesticide residue amount of chlorpyrifos in vegetables
  • Method for detecting pesticide residue amount of chlorpyrifos in vegetables

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Embodiment Construction

[0034] Below in conjunction with embodiment the present invention is further described, but the present invention is not limited to embodiment.

[0035] The invention provides a method for detecting chlorpyrifos pesticide residues in vegetables, which is specifically realized by using a nano-graphene electrochemical sensor.

[0036] In specific applications, chlorpyrifos will undergo electrochemical behavior on the graphene electrochemical sensor, which is measured by differential pulse voltammetry. The results of graphene-modified electrodes at different concentrations of chlorpyrifos are as follows: figure 1 As shown, the standard curve between the DPV peak current of chlorpyrifos and its concentration is as follows figure 2 shown, at 1.0×10 -9 ~2.0×10 -7 There is a linear relationship within the mol / L concentration range, and the linear regression equation is: ip(μA)= 27.108 +0.06429C (nmol / L). According to the measured DPV peak current of chlorpyrifos in vegetables, the...

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Abstract

The invention provides a method for detecting the pesticide residue amount of chlorpyrifos in vegetables. The method is realized by applying a nano-graphene-modified electrode. The method comprises the following steps: pretreating the electrode; constructing an electrochemical sensor interface; detecting a standard chlorpyrifos and establishing a standard curve; treating a vegetable sample; and detecting the sample by using a differential pulse voltammetry, and calculating the content of the chlorpyrifos in the vegetables according to the standard curve of the chlorpyrifos. The method provided by the invention has the advantages of fastness in response, short detection time, easiness in operation, good selectivity, strong influence capability by interfering substances, high sensitivity and readiness and low detection limit, conforms to the development of a fast detection technology for the pesticide residue in China and can meet the requirement of the internationalization for detecting the pesticide residue amount in the vegetables, and the cost of instruments is low.

Description

technical field [0001] The invention establishes a method for detecting chlorpyrifos pesticide residues in vegetables, and belongs to the technical field of pesticide residue detection. Background technique [0002] Chlorpyrifos is a broad-spectrum organophosphorus insecticide with high efficiency, low toxicity and low residue. Its chemical name is O, O-diethyl-O-(3,5,6-trichloro-2-pyridyl) Phosphorothioate is used in the pest control of food, vegetables, fruits and economic crops worldwide, mainly used to control borers, armyworms, scale insects, aphids, cotton bollworms, thrips and leafhoppers on various crops and mites and other pests. Chlorpyrifos is a phosphorothioate insecticide developed by Dow Agrochemicals in 1965. It has become an enduring organophosphorus pesticide with the largest tonnage for more than 40 years. It is the best choice to replace highly toxic organophosphorus pesticides such as methamidophos, parathion, methyl parathion, phosphamide, isocarbophos...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48
Inventor 杨秋慧徐国华陈程黄南概
Owner 杨秋慧
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