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Spectrophotometric and visual detection of the herbicide atrazine by exploiting hydrogen bond-induced aggregation of melamine-modified gold nanoparticles |
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| Authors: | Liu Guangyang Yang Xin Li Tengfei Yu Hailong Du Xinwei She Yongxin Wang Jing Wang Shanshan Jin Fen Jin Maojun Shao Hua Zheng Lufei Zhang Yanxin Zhou Pan |
| Institution: | 1.School of Food Science and Engineering, Harbin Institute of Technology, Harbin, 150090, People’s Republic of China ;2.Key Laboratory of Agro-Product Quality and Safety, Institute of Quality Standard &Testing Technology for Agro-Product, Chinese Academy of Agricultural Sciences, Beijing, 100081, People’s Republic of China ;3.Key Laboratory of Pesticide Chemistry and Application, Ministry of Agriculture, 100081, Beijing, People’s Republic of China ; |
| Abstract: | We report on a method for the determination of the herbicide atrazine in tap water samples using melamine-modified gold nanoparticles (Mel-AuNPs). If a solution containing atrazine is added to a solution of such NPs, a color change occurs from wine-red to blue. This is due to a transition from monodisperse to aggregated Mel-AuNPs and caused by strong hydrogen bonding between atrazine and melamine. The color change can be monitored by a UV–vis spectrophotometer or with bare eyes. The ratio of the absorbances at 640 and 523 nm is linearly related to the logarithm of the atrazine concentration in the 0.165 to 16.5 μM range, and (with different slope) in the 16.5 μM to 330 μM range. The detection limit of atrazine is as low as 16.5 nM (S/N = 3). The method was successfully applied to the determination of atrazine in spiked tap water and gave recoveries that ranged from 72.5 % to 102.3 %.  ᅟ |
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