水中重金属离子的压电传感检测

Determination of Heavy Metal Ions Based on Piezoelectric Effect

基于压电晶体谐振频率的偏移与其表面质量负载相关的基本原理,将巯基乙胺和对巯基苯甲酸层层自组装修饰到压电石英晶振金电极和金纳米粒子上,设计出一种基于纳米金放大质量效应的压电传感方法用于水中Cd2+、Cu2+、Pb2+、Hg2+的检测。与原子吸收法、分光光度法、质谱法及电化学等检测方法相比,该方法具有操作简单、仪器便携、成本低廉等优点,灵敏度和重现性与常规测量方法基本相当。

A quartz crystal microbalance（QCM） method was developed for the determination of heavy metal ions by using MBA functionalized gold nanoparticles as signal enhancer,and ercaptoethylamine-modified gold electrode with the help of self-assembly monolayer（SAM） techniques.In a typical experiment,cadmium（Ⅱ） bounds with amino-groups on gold electrode through complexation.After that,MBA modified nanoparticles were assembled onto gold electrode through complexation of carboxyl group of gold nanoparticles to cadmium（Ⅱ）,thus leading to a mass change which could be used to detect cadmium（Ⅱ）.Determinations of lead（Ⅱ）,mercury（Ⅱ） and copper（Ⅱ） was also studied using this strategy.The results showed that the methodology has low detection limit,high sensitivity and good reproducibility.