Arsenazo III-functionalized gold nanoparticles for photometric determination of uranyl ion

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• 作者：Yun Liang ; Yi He
• 关键词：Arsenazo III ; Plasmonic assay ; Gold nanoparticles ; Uranyl ion ; Detection
• 刊名：Microchimica Acta
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：183
• 期：1
• 页码：407-413
• 全文大小：677 KB
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• 作者单位：Yun Liang (1)
  Yi He (1)
  
  1. School of National Defence Science & Technology, Southwest University of Science and Technology, Mianyang, 621010, People’s Republic of China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Analytical Chemistry
  Inorganic Chemistry
  Physical Chemistry
  Characterization and Evaluation Materials
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  
• 出版者：Springer Wien
• ISSN：1436-5073

文摘

Gold nanoparticles (AuNPs) were functionalized with the indicator dye Arsenazo III via reductive synthesis of AuNPs in the presence of arsenazo III. The indicator dye is shown to be immobilized on the AuNPs via interaction between gold and sulfo groups. The functionalized AuNPs undergo aggregation in the presence of uranyl ion due to the coordination interaction between arsenazo III and uranyl ion. This is accompanied by a longwave shift of the surface plasmon resonance absorption band (from 535 nm to 548 nm) and an up to 46.8 % increase in absorbance. This finding forms the basis for a photometric assay for uranyl ion. It shows good selectivity and has a 0.5 μM detection limit. Applied to the determination of uranyl ion in spiked environmental water samples, the recoveries were between 97 and 106 %.