单颗粒-电感耦合等离子体质谱法检测水中纳米金
首发时间:2015-08-20
摘要:由于纳米材料在如今生产生活中越来越广泛的应用,因此本文建立了以单颗粒-电感耦合等离子体质谱法(SP-ICP-MS)检测水环境中纳米金颗粒粒径的稳定方法。首先基于5倍标准偏差迭代算法以区分纳米颗粒信号与背景信号,得到有意义的纳米颗粒信号强度。探讨了仪器停留时间对纳米金颗粒检测的影响,实验结果得到最优停留时间条件为3 ms。在最优条件下测定30、60、80和100 nm的纳米金标准溶液及100与60 nm的混合标准以检测方法的准确度,实际测得颗粒平均粒径分别为34.16、63.11、80.63和91.39 nm,与标准值基本一致。应用所建立的方法,对纳米金颗粒在不同基质水溶液中6日稳定性进行研究,发现纳米金在水中基本保持稳定,6日内粒径基本保持不变。
关键词: 分析化学 单颗粒-电感耦合等离子体质谱法 纳米金 粒径检测
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Size detection and stability of gold nanoparticle using Single Particle-ICP-MS
Abstract:A reliable method for detecting nanoparticles is necessary with wide application of nanomaterials. Single particle-inductively coupled plasma mass spectrometry (SP-ICP-MS) was investigated to detect size of gold nanoparticle (Au NPs) in this study. Discrimination of particle signal and influence of dwell time were discussed, thus iterative algorithm was used to calculate the baseline of particle signal and 3 ms was selected as dwell time for size detection. Different Au NPs standards (30, 60, 80, 100 nm) and size mixed samples (60 and 100 nm) were determined by SP-ICP-MS, accuracy was confirmed by comparing with reference value. Stability of Au NPs in UP and natural water samples was investigated by detecting size variation of Au NPs, and Au NPs is stable in aqueous environment for 6 days.
Keywords: Analytical Chemistry Single Particle-ICP-MS Gold nanoparticle Size distribution detection
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