基于核壳金@铂纳米粒子的Ag~+比色检测方法

金核铂壳纳米粒子(Au@Pt NPs)具有出色的类过氧化物酶活性,而Ag~+对其催化活性表现出强烈的抑制;基于此,构建了高灵敏的Ag~+比色检测方法。在最佳反应条件下,Au@Pt NPs比色检测Ag~+的线性范围为0.1~10 nmol/L,检出限可达0.05 nmol/L。该方法对汞离子(Hg2~+)也表现出高灵敏的响应,比色检测Hg2~+的线性范围为10~200 nmol/L。将其应用于实际水样中Ag~+的检测,在添加浓度为10,50,100 nmol/L时,回收率为83.8%~97.7%,相对标准偏差为3.0%~9.6%,该方法具有操作简单、灵敏度高、成本低等优点。

Colorimetric Detection of Silver Ions Based on Au@Pt Nanoparticles

Au@Pt NPs have an excellent peroxidase-like activity,and silver ions(Ag+) could intensively inhibit the catalytic ability of Au@Pt NPs.Based on this,a colorimetric detection of Ag+ was performed in a linear range of 0.1- 10 nmol/L with a detection limit of 0.05 nmol/L.The sensing system also showed a sensitive response to Hg2+.A linear range of 10-200 nmol/L and a detection limit of 5.0 nmol/L were achieved in the colorimetric detection for Hg2+.The method was applied in detection of tap water spiked with Ag+(10,50,100 nmol/L),and the recoveries ranged from 83.8% to 97.7% with relative standard deviations(RSD) of 3.0%-9.6%.This method has the advantages of simplicity,sensitivity and low cost.