期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 231, 期 -, 页码 64-69出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.03.007
关键词
Mercury(II) ions; Chemiluminescent sensor; Gold nanoparticles; Non-aggregation
资金
- Foundation of Science and Technology Department of Sichuan Province [2015JY0053]
- Doctoral Program of Southwest University of Science and Technology [14zx7165]
- Teaching Reform Project of Southwest University of Science and Technology [15xn0077]
- Undergraduate Innovation Fund Project of Southwest University of Science and Technology [CX15-011]
A selective chemiluminescent sensor was developed for the detection of mercury(II) ions (Hg2+) in environmental water and soil supernatant samples using non-aggregated luminol-capped gold nanoparticles (AuNPs). Luminol-capped AuNPs can react with silver nitrate (AgNO3) under alkaline environment, generating a strong chemiluminescence (CL) emission because AuNPs had excellent catalytic activity for luminol-AgNO3 CL system. However, when Hg2+ was added to the solution of luminol-capped AuNPs, it would be adsorbed on the surface of luminol-capped AuNPs according to the inherent affinity of AuNPs for Hg2+. The presence of Hg2+ significantly inhibited the catalytic activity of AuNPs, leading to CL quenching. With the increasing of Hg2+ concentration, the CL intensity gradually decreased. Under the optimal detection conditions, the developed CL sensor showed a good linear relationship in range of 10-600 nM with a limit of detection of 1 nM at a signal-to-noise ratio of three which was below the maximum allowable concentration for Hg2+ in drinking water (10 nM) defined by United States Environmental Protection Agency. Also, the developed CL sensor exhibited high selectivity toward Hg2+ over other environmentally relevant metal ions at high concentrations (500 mu M). (C) 2016 Elsevier B.V. All rights reserved.
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