摘要
利用积分脉冲安培法和电流-时间(I-t)曲线法测定苯乙胺,对两种方法的测定条件分别进行优化,并比较两种方法的测定效果。结果表明:采用纳米金修饰金电极(AuNPs/AuE),在初始电位为0.1 V时,运用I-t曲线法测定苯乙胺具有良好的选择性和较高的灵敏度。苯乙胺的响应电流差值与苯乙胺浓度在4.13×10~(-8)~4.72×10~(-6) mol/L范围内呈良好的线性关系,检出限为1.4×10~(-8) mol/L。用该法测定鱼露样品中苯乙胺的加标回收率在90.0%~110.8%之间。该法检测速度快、成本低、选择性好,适用于水产品及其制品中苯乙胺的测定。
Phenethylamine was determined by the integrated pulsed amperometric(IPA) method and the amperometric current-time curve method. The detection conditions of the two methods were optimized, and the obtained results were compared with each other. The results showed that the amperometric I-t curve method had better selectivity and higher sensitivity to phenethylamine based on gold nanoparticles(AuNPs) modified gold electrode(AuE) at an initial potential of 0.1 V. The difference of response current had a good linear relationship with the concentration of phenethylamine in the range of 4.13 × 10-8–4.72 × 10-6 mol/L. The limit of detection(LOD) was 1.4 × 10-8 mol/L. The recovery of phenethylamine from spiked fish sauce was in the range of 90.0%–110.8%. This method was rapid, inexpensive, highly selective, and suitable for determination of phenethylamine in aquatic products.
引文
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