【摘要】 将单壁碳纳米管(SWCNTs)悬浊液和纳米金(nano Au)溶液混匀后滴涂在玻碳电极表面,自然干燥后再将离子液体BMIMPF6的甲醇溶液滴涂在上述电极上,制得单壁碳纳米管-纳米金-离子液体修饰玻碳电极(SWCNTs-nano Au-BMIMPF6/GCE)。用循环伏安方法研究了辛硫磷在pH 4.0的磷酸盐支持电解质中,在电位-1.1～-0.1V(vs.SCE)范围内,在修饰电极上的电化学行为。结果表明:在电位-0.81V处可见明显的还原峰,且其峰电流与辛硫磷的浓度在6.0×10-7～1.2×10-3 mmol.L-1范围内呈线性关系,检出限(3S/N)为3.0×10-7 mmol.L-1。据此提出了用线性伏安法测定辛硫磷的方法,用标准加入法测得其回收率在96.0%～105.5%之间,测定值的相对标准偏差(n=6)在3.3%～3.9%之间。更多还原

【Abstract】 A mixture of dispersion of SWCNTs and nano Au solution was added dropwise onto the surface of glassy carbon electrode(GCE),after air-drying,methanol solution of ionic liquid,BMIMPF6 was added dropwise onto the surface of the above electrode.The modified electrode,designated as SWCNTs-nano Au-BMIMPF6/GCE was thus prepared.Electrochemical behavior of phoxim at the modified electrode was studied by cyclic voltammetry in a phosphate buffer supporting electrolyte of pH 4.0 in the potential range of-1.1 to-0.1 V(vs.SCE).As shown by the experimental results,a significant reduction peak was observed at-0.81 V,and linear relationship between values of reduction peak current and concentration of phoxim was kept in the range of 6.0×10-7 to 1.2×10-3mmol·L-1,with detection limit(3S/N) of 3.0 ×10-7mmol·L-1.Based on these findings,a method for determination of phoxim by linear voltammetry was proposed.Recovery was tested by standard addition method,giving values of recovery and RSD′s(n=6) in the ranges of 96.0%-105.5% and 3.3%-3.9% respectively.更多还原