alexa Square-Wave Voltammetric Determination of Paraquat at Carbon Paste Electrode Modified with Hydroxyapatite


Journal of Biosensors & Bioelectronics

Author(s): ElMhammedi MA Bakasse M Chta

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The voltammetric behavior of paraquat was investigated at hydroxyapatite-modified carbon paste electrode HAP-CPE in K2SO4. A method was developed for the detection of the trace of this herbicide, based on their redox reaction. The reduction peaks of paraquat were observed around −0.70 V and −1.00 V (vs. SCE) in square-wave voltammetry. Experimental conditions were optimized by varying the accumulation time, apatite loading and measuring solution pH. Calibration plots were linear under the optimized parameters over the herbicide's concentration range 8–200×10−7 mol L−1, with a detection and quantification limits about 1.5×10−8 mol L−1 and 6.4 10−8 mol L−1, respectively.

This article was published in Electroanalysis and referenced in Journal of Biosensors & Bioelectronics

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