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Open AccessArticle

Ratiometric Strategy for Electrochemical Sensing of Carbaryl Residue in Water and Vegetable Samples

College of Food Science and Engineering, Northwest A&F University, No.22 Xinong Road, Yangling 712100, China
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Author to whom correspondence should be addressed.
Sensors 2020, 20(5), 1524; https://doi.org/10.3390/s20051524
Received: 7 February 2020 / Revised: 1 March 2020 / Accepted: 6 March 2020 / Published: 10 March 2020
(This article belongs to the Special Issue Sensors for Environmental and Life Science Applications)
Accurate analysis of pesticide residue in real samples is essential for food safety and environmental protection. However, a traditional electrochemical sensor based on single-signal output is easily affected by background noise, environmental conditions, electrode diversity, and a complex matrix of samples, leading to extremely low accuracy. Hence, in this paper, a ratiometric strategy based on dual-signal output was adopted to build inner correction for sensing of widely-used carbaryl (CBL) for the first time. By comparison, Nile blue A (NB) was selected as reference probe, due to its well-defined peak, few effects on the target peak of CBL, and excellent stability. The effects of a derivatization method, technique mode, and pH were also investigated. Then the performance of the proposed ratiometric sensor was assessed in terms of three aspects including the elimination of system noise, electrode deviation and matrix effect. Compared with traditional single-signal sensor, the ratiometric sensor showed a much better linear correlation coefficient (r > 0.99), reproducibility (RSD < 10%), and limit of detection (LOD = 1.0 μM). The results indicated the introduction of proper reference probe could ensure the interdependence of target and reference signal on the same sensing environment, thus inner correction was fulfilled, which provided a promising tool for accurate analysis. View Full-Text
Keywords: ratiometric strategy; electrochemical sensor; carbaryl residue; water samples; vegetable samples; carbon cloth ratiometric strategy; electrochemical sensor; carbaryl residue; water samples; vegetable samples; carbon cloth
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MDPI and ACS Style

Zhang, M.; Zhang, Z.; Yang, Y.; Zhang, Y.; Wang, Y.; Chen, X. Ratiometric Strategy for Electrochemical Sensing of Carbaryl Residue in Water and Vegetable Samples. Sensors 2020, 20, 1524.

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