纳米金增强低温等离子体离子化质谱快速检测苯胺

Rapid Determination of Aniline by Gold Nanoparticles-enhanced Low Temperature Plasma Ionization Mass Spectrometry

低温等离子体(Low-temperature plasma,LTP)作为敞开式离子源满足环境检测要求的样品原位、快速检测,然而水体的基体效应使得检测灵敏度不足。该文将金纳米颗粒溅射于针灸针表面后,结合低温等离子体离子源进行检测,实现了质谱信号的增强效应,可以快速灵敏检测水体中的苯胺。结果表明,相比于无纳米金修饰的针尖,苯胺检测信号强度增强了43倍,且具有较低的背景噪音。苯胺的质量浓度与质谱信号强度在1~50μg/L范围内呈线性关系,检出限(LOD)为0.64μg/L,每个样品检测时间约为1 min。该方法简单易操作,结合便携式质谱有望用于环境水体及突发性水源污染事件中苯胺的检测。

A gold nanoparticles-enhanced low-temperature plasma ionization mass spectrometry was developed for the rapid determination of aniline.As an ambient mass spectrometry ion source,low-temperature plasma(LTP)could meet the requirements for in-situ and rapid detection.However,the matrix effect of water sample makes the detection sensitivity inadequate.In this study,low-temperature plasma ion source was combined with gold nanoparticles modified acupuncture needles to create a good enhancement effect toward the mass spectrometry signal,which could be used to quickly and sensitively detect aniline.Results showed that the signal intensity for aniline is 56 times stronger.Meanwhile,the background noise is lower.There is a linear relationship between the signal intensity and the concentration of aniline in the range of 1-50μg/L,with a detection limit(LOD)of 0.64μg/L,and the consuming time for each sample is about 1 min.The proposed method herein is simple and easy to operate,and is expected to be applied in the detection of aniline in environmental water.