title: Square wave voltammetry for analytical determination of paraquat at carbon paste electrode modified with fluoroapatite.
abstract: This paper describes the construction of a carbon paste electrode (CPE) impregnated with fluoroapatite (FAP). The new electrode (FAP-CPE) was revealed an interesting determination of paraquat. The latter was accumulated on the surface of the modified electrode by adsorbing onto fluoroapatite and reduced in 0.1molL(-1) K2SO4 electrolyte at -0.70 and -1.0V for peaks 1 and 2, respectively. Experimental conditions were optimized by varying the accumulation time, FAP loading and measuring solution pH. Under the optimized working conditions, calibration graphs were linear in the concentration ranging from 5×10(-8) to 7×10(-5)molL(-1) with detection limits (DL,3σ) of 3.5×10(-9) and 7.4×10(-9)molL(-1), respectively, for peaks 1 and 2. Fluoroapatite was characterized by X-ray diffraction XRD analysis; Fourier-transform infrared spectroscopy FT-IR and inductively coupled plasma-atomic emission spectrometry (ICP-AES) analysis.
authors.affiliation: Equipe d'Electrochimie et des Matériaux Inorganiques, Université Cadi Ayyad, Faculté des Sciences et Techniques, BP: 523, Beni-Mellal, Morocco. Electronic address: elmhammedi@yahoo.fr.
authors.forename: M A
authors.initials: MA
authors.lastname: El Mhammedi
authors.affiliation: Equipe d'Analyse des Micro-Polluants Organiques, Faculté des Sciences, Université Chouaib Doukkali, BP: 20, El jadida, Morocco.
authors.forename: M
authors.initials: M
authors.lastname: Bakasse
authors.affiliation: Agence du Bassin Hydraulique de l'Oum Er Rbia, Beni Mellal, Morocco.
authors.forename: R
authors.initials: R
authors.lastname: Bachirat
authors.affiliation: Equipe d'Electrochimie et des Matériaux Inorganiques, Université Cadi Ayyad, Faculté des Sciences et Techniques, BP: 523, Beni-Mellal, Morocco.
authors.forename: A
authors.initials: A
authors.lastname: Chtaini
keywords: Adsorbant; Carbon paste electrode; Fluoroapatite; Paraquat; Square wave voltammetry