Square‐Wave Voltammetric Determination of Paraquat at Carbon Paste Electrode Modified with Hydroxyapatite |
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| Authors: | Moulay?Abderrahim El?Mhammedi Mina Bakasse Abdelilah Chtaini |
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| Institution: | 1. Equipe d'Electrochimie et des Matériaux Inorganiques, Université Cadi Ayyad, Faculté des Sciences et Techniques, BP: 523, Beni‐Mellal, Morocco;2. Equipe d'Analyse des Micro‐Polluants Organiques, Faculté des Sciences, Université Chouaib Doukkali, BP: 20, El jadida, Morocco |
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| Abstract: | 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. |
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| Keywords: | Paraquat Apatite Adsorption River water Square‐wave voltammetry |
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