Amare Meareg, Abicho Samuel, Admassie Shimelis
J AOAC Int. 2014 Mar-Apr;97(2):580-5. doi: 10.5740/jaoacint.12-124.
A glassy carbon electrode (GCE) modified with poly(4-amino-3-hydroxynaphthalene sulfonic acid) (poly-AHNSA) was used for the selective and sensitive determination of fenitrothion (FT) organophosphorus pesticide in water. The electrochemical behavior of FT at the bare GCE and the poly-AHNSA/GCE were compared using cyclic voltammetry. Enhanced peak current response and shift to a lower potential at the polymer-modified electrode indicated the electrocatalytic activity of the polymer film towards FT. Under optimized solution and method parameters, the adsorptive stripping square wave voltammetric reductive peak current of FT was linear to FT concentration in the range of 0.001 to 6.6 x 10(-6) M, and the LOD obtained (3delta/m) was 7.95 x 10(-10) M. Recoveries in the range 96-98% of spiked FT in tap water and reproducible results with RSD of 2.6% (n = 5) were obtained, indicating the potential applicability of the method for the determination of trace levels of FT in environmental samples.
采用聚（4-氨基-3-羟基萘磺酸）（poly-AHNSA）修饰的玻碳电极（GCE）用于选择性灵敏测定水中的杀螟硫磷（FT）有机磷农药。使用循环伏安法比较了FT在裸GCE和poly-AHNSA/GCE上的电化学行为。聚合物修饰电极上增强的峰电流响应和向更低电位的偏移表明聚合物膜对FT具有电催化活性。在优化的溶液和方法参数下，FT的吸附溶出方波伏安还原峰电流与FT浓度在0.001至6.6×10⁻⁶ M范围内呈线性关系，获得的检测限（3δ/m）为7.95×10⁻¹⁰ M。在自来水中加标FT的回收率在96 - 98%范围内，相对标准偏差为2.6%（n = 5）的重现性结果表明该方法在环境样品中测定痕量FT具有潜在的适用性。
