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 effects of simple preparation method, wide detection range and fast analysis speed.

Inactive Publication Date: 2015-05-13
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

[0017] The electrochemical sensor detection method of rapid detection trace carbendazim pesticide of the present invention:

[0018] The glassy carbon electrode was polished with 1800#, 2000#, 4000# metallographic sandpaper respectively, and then with acetone, ethanol, 10% NaOH solution, 1:1 HNO 3 solution, washed with double distilled water, and dried for later use. The glassy carbon electrode was charged at 50mV·S -1 Sweep rate at 0.5mol / LH 2 SO 4 Scan between -0.2V and 1.2V until stable, then dry. Add 0.2g montmorillonite (MMT) to 100mL deionized water, stir and heat to 80°C for 2h pretreatment, and let stand for 12 hours. Add 1 g of diethylene glycol diacrylate (PDDA) to 100 mL of deionized water, add 1 g of NaCl, and adjust the pH to 9-10 with 0.1 mol / L NaOH solution. The prepared solution was mixed at a constant temperature to 60° C., stirred for 12 hours, centrifuged, filtered under reduced pressure, vacuum-dried, and ground into powder. Take 0.005g powder and add...

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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

[0001] An electrochemical sensor detection method for rapid detection of trace amounts of carbendazim pesticide Technical field: [0002] The invention belongs to the field of analysis and detection, and relates to an electrochemical method for detection of trace carbendazim. Background technique: [0003] Carbendazim, also known as cotton wilt, methyl 2-benzimidazolyl carbamate, has a good bactericidal effect and is widely used in pesticides. For crop diseases caused by fungi, carbendazim can prevent and treat diseases; It can also be used as an anti-mold agent for stored fruits and eggs. Carbendazim has certain toxicity to both humans and animals, and can cause poisoning symptoms such as dizziness, nausea, chest tightness, and trance. It has a long residual effect period, is toxic to mammals, and can also poison humans through the esophagus. Therefore, the detection of carbendazim residues in agricultural products has also been paid more and more attention. At present, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/48
Inventor 罗宿星伍远辉勾华
Owner ZUNYI NORMAL COLLEGE
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