Novel, highly selective detection of Cr(III) in aqueous solution based on a gold nanoparticles colorimetric assay and its application for determining Cr(VI)

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• 作者：Liang Zhao ; Yin Jin ; Zhangwei Yan ; Yuanyuan Liu ; Hongjun Zhu ; ^{zhuhjnjut@hotmail.com}
• 关键词：Colorimetric assay ; Gold nanoparticles ; Chromium detection ; Aqueous solution
• 刊名：Analytica Chimica Acta
• 出版年：2012
• 出版时间：20 June, 2012
• 年：2012
• 卷：731
• 期：Complete
• 页码：75-81
• 全文大小：1015 K

文摘

A simple, rapid, sensitive and field-portable colorimetric technique for the determination of Cr(III) in aqueous solution based on an aggregation-induced color transition of gold nanoparticles (AuNPs) has been developed. AuNPs were first functionalized with a dithiocarbamate-modified N-benzyl-4-(pyridin-4-ylmethyl)aniline ligand (BP-DTC). Chelation of Cr(III) by several of these ligands, bound to different nanoparticles, led to nanoparticle aggregation in solution. This gave rise to a color change from wine-red to blue that was discernible by the naked eye and an easily measurable alteration in the extinction spectrum of the particles. The method could be used to determine Cr(III) with a detection limit of 31 ppb. Furthermore, selective detection of trace Cr(III) in aqueous solution in the presence of 12 other transition metal ions has been achieved. Toward the goal of practical applications, the sensor has been further evaluated with a view to monitoring Cr(III) in nutritional supplements and the blood of diabetes patients and also applied in the indirect determination of Cr(VI) in waste water.