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Electrochemical sensor detection method for rapidly detecting trace carbendazim pesticide

A detection method and sensor technology, applied in the field of analysis and detection, can solve the problems of complex sample pretreatment, high analysis cost, long detection time, etc., and achieve the effect of simple preparation method, wide detection range and fast analysis speed

Inactive Publication Date: 2013-12-25
ZUNYI NORMAL COLLEGE
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Problems solved by technology

At present, the detection methods of carbendazim residues mainly include high-performance liquid chromatography, gas-mass spectrometry and other technologies, but these detection methods require high-end detection instruments, complicated sample pretreatment, long detection time, high analysis cost, and cannot realize the analysis of a large number of samples. Rapid on-site detection is difficult to popularize, so the application is limited

Method used

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Embodiment Construction

[0016] The electrochemical sensor detection method for rapidly detecting trace amounts of carbendazim pesticides of the present invention:

[0017] The glassy carbon electrodes were polished with 1800#, 2000#, and 4000# metallographic sandpaper, respectively, and then used acetone, ethanol, 10% NaOH solution, and 1:1 HNO solution respectively. 3 solution, rinsed with twice distilled water, and dried for later use. the

[0018] Glassy carbon electrode at 50mV·S -1 Scan speed at 0.5mol / LH 2 SO 4 Scan to stable between -0.2V-1.2V and dry. Add 0.2 g of montmorillonite (MMT) to 100 mL of deionized water, stir and heat to 80 °C for 2 h, and let stand for 12 h. 1 g of diethylene glycol diacrylate (PDDA) was added to 100 mL of deionized water, 1 g of NaCl was added, and the pH was adjusted to 9-10 with 0.1 mol / L NaOH solution. The prepared solution was heated to 60°C and mixed, stirred for 12 hours, centrifuged, filtered under reduced pressure, vacuum dried, and ground into powd...

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Abstract

The invention discloses an electrochemical sensor detection method for rapidly detecting a trace carbendazim pesticide. The method comprises the following steps: 1, adding 0.2-2g of montmorillonite to 100mL of water to heat to 80 DEG C for 2 hours; 2, adding 0.2g of phthalate glycol acrylate to 100mL of water, adding 1g of NaCl, regulating pH to 9-10 by 0.1 mol / L NaOH solution; 3, mixing and heating the solution in the step 2 with the solution in the step 1 to 60 DEG C from constant temperature, and forming powder; 4, polishing a glassy carbon electrode, and respectively cleaning by acetone, ethanol, 10% NaOH solution, HNO3 of 1:1 and water; 5, scanning the glassy carbon electrode in the step 4 at the speed of 50 mV.S<-1>; 6, taking 0.005g of phthalate glycol acrylate modified montmorillonite, so as to obtain a sensor; 7, putting the sensor into a carbendazim solution, adding a B-R buffer solution, and detecting by a differential pulse voltammetry. The method is simple and fast.

Description

Technical field: [0001] The invention belongs to the field of analysis and detection, and relates to an electrochemical method for detecting trace amounts of carbendazim. Background technique: [0002] Carbendazim, also known as Mianweiling, 2-benzimidazolyl methyl carbamate, has good bactericidal effect and is widely used in pesticides. Carbendazim can play a role in the prevention and control of crop diseases caused by fungi; It can also be used as a mildew and preservative for storing fruits and eggs. Carbendazim is toxic to humans and animals, and can cause symptoms such as dizziness, nausea, chest tightness, and trance. It has a long residual period, is toxic to mammals, and can also poison people through the esophagus. Therefore, the detection of carbendazim residues in agricultural products has also received increasing attention. At present, the detection of carbendazim residues mainly includes high-performance liquid chromatography, gas-mass spectrometry and other...

Claims

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Application Information

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IPC IPC(8): G01N27/48
Inventor 罗宿星伍远辉勾华
Owner ZUNYI NORMAL COLLEGE
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