Highly sensitive detection of chromium (III) ions by resonance Rayleigh scattering enhanced by gold nanoparticles
Highly sensitive detection of chromium (III) ions by resonance Rayleigh scattering enhanced by gold nanoparticles
复制标题
通过金纳米粒子增强的共振瑞利散射对铬 (III) 离子进行高灵敏度检测
DOI：
10.1016/j.saa.2013.09.058
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发表时间：
2014-01-24
影响因子：
4.4
通讯作者：
Cai, Jiye
中科院分区：
文献类型：
--
作者：
Chen, Min;Cai, Huai-Hong;Cai, Jiye
铬（III）离子（Cr 3+）的简单、灵敏的测定在环境中痕量污染物的检测中具有潜在的应用价值。在这里，该测定是基于共振瑞利散射（RRS）的增强由铬3+诱导的柠檬酸盐封端的金纳米粒子（AuNP）的聚集。利用透射电子显微镜（TEM）和紫外-可见吸收光谱（UV-vis absorption spectroscopy）对Cr 3 +-AuNP体系的纳米结构和光谱性质进行了表征。对反应时间、pH值、盐浓度、干扰离子等实验条件进行了研究。结合Cr ~（3+）-柠檬酸螯合的信号放大和RRS技术的高灵敏度，可选择性地测定Cr ~（3+）离子，检测限高达1.0 pM。整个分析可以在室温下进行，仅需20分钟，使其适用于环境和食品样品的高通量常规应用。(C)2013爱思唯尔有限公司版权所有。
Simple and sensitive determination of chromium (III) ions (Cr3+) has potential applications for detecting trace contamination in environment. Here, the assay is based on the enhancement of resonance Rayleigh scattering (RRS) by Cr3+-induced aggregation of citrate-capped gold nanoparticles (AuNPs). Transmission electron microscopy (TEM) and UV-vis absorption spectroscopy were employed to characterize the nano-structures and spectroscopic properties of the Cr3+-AuNP system. The experiment conditions, such as reaction time, pH value, salt concentration and interfering ions, were investigated. The combination of signal amplification of Cr3+-citrate chelation with high sensitivity of RRS technique allow a selective assay of Cr3+ ions with a detection limit of up to 1.0 pM. The overall assay can be carried out at room temperature within only twenty minutes, making it suitable for high-throughput routine applications in environment and food samples. (C) 2013 Elsevier B.V. All rights reserved.