Square wave voltammetry for analytical determination of paraquat at carbon paste electrode modified with fluoroapatite
Square wave voltammetry for analytical determination of paraquat at carbon paste electrode modified with fluoroapatite
复制标题
DOI：
10.1016/j.foodchem.2008.03.005
复制
发表时间：
2008-10-15
期刊：
影响因子：
8.8
通讯作者：
Chtaini, A.
中科院分区：
文献类型：
--
作者：
El Mhammedi, M. A.;Bakasse, M.;Chtaini, A.
本文介绍了氟磷灰石（FAP）浸渍碳糊电极（CPE）的结构。新电极（FAP-CPE）是测定百草枯的有趣方法。后者通过氟磷灰石吸附在修饰电极表面，在0.1 mol L-1的K2SO4电解质中，峰1和峰2分别在-0.70和-1.0 V下还原。通过改变积累时间、FAP加载量和测定溶液ph对实验条件进行优化。在优化的工作条件下，峰1和峰2在5 × 10(-8) ~ 7 × 10(-5) mol -1范围内的校准图呈线性关系，检出限（DL,3 sigma）分别为3.5 × 10（-9）和7.4 × 10(-9) mol -1。氟磷灰石的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。(C) 2008 Elsevier Ltd版权所有。
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 0.1 mol L-1 K2SO4 electrolyte at -0.70 and -1.0 V 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 x 10(-8) to 7 x 10(-5) mol L-1 with detection limits (DL,3 sigma) of 3.5 x 10(-9) and 7.4 x 10(-9) mol L-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. (C) 2008 Elsevier Ltd. All rights reserved.