用于在氟磷灰石修饰的碳糊电极上分析测定百草枯的方波伏安法。
Square wave voltammetry for analytical determination of paraquat at carbon paste electrode modified with fluoroapatite.
作者信息
El Mhammedi M A, Bakasse M, Bachirat R, Chtaini A
机构信息
Equipe d'Electrochimie et des Matériaux Inorganiques, Université Cadi Ayyad, Faculté des Sciences et Techniques, BP: 523, Beni-Mellal, Morocco.
Equipe d'Analyse des Micro-Polluants Organiques, Faculté des Sciences, Université Chouaib Doukkali, BP: 20, El jadida, Morocco.
出版信息
Food Chem. 2008 Oct 15;110(4):1001-6. doi: 10.1016/j.foodchem.2008.03.005. Epub 2008 Mar 10.
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.
本文描述了一种浸渍有氟磷灰石（FAP）的碳糊电极（CPE）的构建。新电极（FAP-CPE）显示出对百草枯的有趣测定结果。百草枯通过吸附在氟磷灰石上而积累在修饰电极表面，并分别在-0.70V和-1.0V的0.1molL⁻¹ K₂SO₄电解质中还原，对应峰1和峰2。通过改变积累时间、FAP负载量和测量溶液pH对实验条件进行了优化。在优化的工作条件下，校准曲线在5×10⁻⁸至7×10⁻⁵molL⁻¹的浓度范围内呈线性，峰1和峰2的检测限（DL，3σ）分别为3.5×10⁻⁹和7.4×10⁻⁹molL⁻¹。通过X射线衍射（XRD）分析、傅里叶变换红外光谱（FT-IR）和电感耦合等离子体原子发射光谱（ICP-AES）分析对氟磷灰石进行了表征。
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