Ratio-type electrochemical sensor, preparation method and method for simultaneously detecting parathion-methyl and carbendazim

By using a CeCoZn-MOF/NBA/CNHs-modified glassy carbon electrode and differential pulse voltammetry, a ratiometric electrochemical sensor was developed for the simultaneous detection of methyl parathion and carbendazim with high sensitivity and selectivity. This method solves the problem of interference susceptibility of traditional electrochemical sensors and is suitable for the detection of agricultural product quality and safety.

CN122171638APending Publication Date: 2026-06-09JIANGSU UNIV OF TECH
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Patent Information

Application Number
CN202610377395.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-26
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing technologies struggle to achieve highly sensitive and selective simultaneous detection of methyl parathion and carbendazim. Traditional electrochemical sensors are susceptible to the effects of electrode modification methods and environmental conditions, resulting in poor accuracy and repeatability of detection results.

Method used

A glassy carbon electrode modified with CeCoZn-MOF/NBA/CNHs was used as the working electrode. Combined with differential pulse voltammetry, a ratiometric electrochemical sensor was used to detect methyl parathion and carbendazim. The high porosity and multi-valence state characteristics of CeCoZn-MOF and the combination of CNHs and NBA provided a stable internal standard signal, enhancing the electrode's conductivity and adsorption performance.

Benefits of technology

It enables rapid, accurate, and highly interference-resistant simultaneous detection of methyl parathion and carbendazim, with a wide linear detection range, making it suitable for agricultural product quality and safety testing. It solves the problems of complexity, low efficiency, and insufficient accuracy of existing detection methods.

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Abstract

The invention discloses a ratio type electrochemical sensor, a preparation method and a method for simultaneously detecting parathion-methyl and carbendazim. According to the sensor, a CeCoZn-MOF / NBA / CNHs modified glassy carbon electrode is used as a working electrode, saturated KCl type Ag / AgCl is used as a reference electrode, and a platinum wire is used as a counter electrode; the preparation method comprises the steps of electrode pretreatment, CeCoZn-MOF synthesis, composite material compounding, dispersion liquid preparation and electrode dispensing modification. Differential pulse voltammetry is adopted for detection, nile blue A is used as an internal standard probe, quantification is carried out through the current ratio of a target object to an internal standard object, the linear detection range of parathion-methyl is 0.05-15 [mu] g / mL, the linear detection range of carbendazim is 0.05-4 [mu] g / mL, and correlation coefficients are all larger than 0.99. The sensor is high in anti-interference performance, sensitivity and accuracy, the adding standard recovery rate of an actual agricultural product sample is 91.0%-109.2%, rapid, synchronous and accurate detection of parathion-methyl and carbendazim can be achieved, and the sensor is suitable for on-site rapid detection of pesticide residues of agricultural products.
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