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制备了单壁碳纳米管/金-四氧化三铁纳米粒子复合材料修饰玻碳电极,用循环伏安法研究了对硫磷在该电极上的电化学行为。该电极对对硫磷具有较好的富集和催化特性,在优化条件下,对硫磷的浓度与其峰电流在2.0×10-9～1.0×10-6 mol/L范围内呈线性关系,其检出限为1.0×10-9 mol/L。对1.0×10-7 mol/L的对硫磷溶液平行测定9次的RSD为3.9%(n=9)。用该电极对不同蔬菜样品中的对硫磷进行测定,平均回收率在96.0%～105.5%之间,相对标准偏差在3.3%～3.9%之间。
Single-walled carbon nanotube / gold-iron tetroxide nanoparticle composite modified glassy carbon electrode was prepared. The electrochemical behavior of parathion on the electrode was investigated by cyclic voltammetry. The electrode has a good enrichment and catalytic properties for parathion. Under optimal conditions, the concentration of parathion has a linear relationship with the peak current in the range of 2.0 × 10-9 ~ 1.0 × 10-6 mol / L, The detection limit was 1.0 × 10-9 mol / L. The RSD was 9% for 9 parallel assays on 1.0 × 10-7 mol / L parathion solution (n = 9). The parathion content in different vegetable samples was determined by this electrode. The average recoveries ranged from 96.0% to 105.5% with relative standard deviations between 3.3% and 3.9%.